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421 lines
14 KiB
421 lines
14 KiB
; RUN: llc < %s -mtriple=armv7-apple-ios | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-LE
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; RUN: llc < %s -mtriple=thumbv7-none-linux-gnueabihf | FileCheck %s --check-prefix=CHECK-THUMB --check-prefix=CHECK-THUMB-LE
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; RUN: llc < %s -mtriple=armebv7 -target-abi apcs | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-BE
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; RUN: llc < %s -mtriple=thumbebv7-none-linux-gnueabihf | FileCheck %s --check-prefix=CHECK-THUMB --check-prefix=CHECK-THUMB-BE
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define i64 @test1(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test1:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-LE: adds [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK-LE: adc [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE: adds [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE: adc [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test1:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-LE: adds.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB-LE: adc.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE: adds.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE: adc.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw add i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test2(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test2:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-LE: subs [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK-LE: sbc [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE: subs [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE: sbc [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test2:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-LE: subs.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB-LE: sbc.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE: subs.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE: sbc.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw sub i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test3(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test3:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-LE-DAG: and [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK-LE-DAG: and [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE-DAG: and [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE-DAG: and [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test3:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-LE-DAG: and.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB-LE-DAG: and.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE-DAG: and.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE-DAG: and.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw and i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test4(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test4:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-LE-DAG: orr [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK-LE-DAG: orr [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE-DAG: orr [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE-DAG: orr [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test4:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-LE-DAG: orr.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB-LE-DAG: orr.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE-DAG: orr.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE-DAG: orr.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw or i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test5(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test5:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-LE-DAG: eor [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK-LE-DAG: eor [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE-DAG: eor [[REG4:(r[0-9]?[13579])]], [[REG2]]
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; CHECK-BE-DAG: eor [[REG3:(r[0-9]?[02468])]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test5:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-LE-DAG: eor.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB-LE-DAG: eor.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE-DAG: eor.w [[REG4:[a-z0-9]+]], [[REG2]]
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; CHECK-THUMB-BE-DAG: eor.w [[REG3:[a-z0-9]+]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[REG3]], [[REG4]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw xor i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test6(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test6:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK: strexd {{[a-z0-9]+}}, {{r[0-9]?[02468]}}, {{r[0-9]?[13579]}}
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test6:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, {{[a-z0-9]+}}, {{[a-z0-9]+}}
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw xchg i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test7(i64* %ptr, i64 %val1, i64 %val2) {
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; CHECK-LABEL: test7:
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; CHECK-DAG: mov [[VAL1LO:r[0-9]+]], r1
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-LE-DAG: eor [[MISMATCH_LO:.*]], [[REG1]], [[VAL1LO]]
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; CHECK-LE-DAG: eor [[MISMATCH_HI:.*]], [[REG2]], r2
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; CHECK-BE-DAG: eor [[MISMATCH_LO:.*]], [[REG2]], r2
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; CHECK-BE-DAG: eor [[MISMATCH_HI:.*]], [[REG1]], r1
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; CHECK: orrs {{r[0-9]+}}, [[MISMATCH_LO]], [[MISMATCH_HI]]
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; CHECK: bne
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; CHECK-DAG: dmb {{ish$}}
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; CHECK: strexd {{[a-z0-9]+}}, {{r[0-9]?[02468]}}, {{r[0-9]?[13579]}}
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; CHECK: cmp
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; CHECK: beq
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test7:
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-LE-DAG: eor.w [[MISMATCH_LO:[a-z0-9]+]], [[REG1]], r2
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; CHECK-THUMB-LE-DAG: eor.w [[MISMATCH_HI:[a-z0-9]+]], [[REG2]], r3
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; CHECK-THUMB-BE-DAG: eor.w [[MISMATCH_HI:[a-z0-9]+]], [[REG1]], r2
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; CHECK-THUMB-BE-DAG: eor.w [[MISMATCH_LO:[a-z0-9]+]], [[REG2]], r3
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; CHECK-THUMB-LE: orrs.w {{.*}}, [[MISMATCH_LO]], [[MISMATCH_HI]]
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, {{[a-z0-9]+}}, {{[a-z0-9]+}}
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; CHECK-THUMB: cmp
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; CHECK-THUMB: beq
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; CHECK-THUMB: dmb {{ish$}}
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%pair = cmpxchg i64* %ptr, i64 %val1, i64 %val2 seq_cst seq_cst
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%r = extractvalue { i64, i1 } %pair, 0
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ret i64 %r
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}
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; Compiles down to a single ldrexd
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define i64 @test8(i64* %ptr) {
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; CHECK-LABEL: test8:
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK-NOT: strexd
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; CHECK: clrex
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; CHECK-NOT: strexd
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test8:
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB-NOT: strexd
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; CHECK-THUMB: clrex
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; CHECK-THUMB-NOT: strexd
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; CHECK-THUMB: dmb {{ish$}}
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%r = load atomic i64, i64* %ptr seq_cst, align 8
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ret i64 %r
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}
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; Compiles down to atomicrmw xchg; there really isn't any more efficient
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; way to write it.
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define void @test9(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test9:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK: strexd {{[a-z0-9]+}}, {{r[0-9]?[02468]}}, {{r[0-9]?[13579]}}
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test9:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, {{[a-z0-9]+}}, {{[a-z0-9]+}}
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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store atomic i64 %val, i64* %ptr seq_cst, align 8
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ret void
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}
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define i64 @test10(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test10:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK: mov [[OUT_HI:[a-z0-9]+]], r2
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; CHECK-LE: subs {{[^,]+}}, r1, [[REG1]]
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; CHECK-BE: subs {{[^,]+}}, r2, [[REG2]]
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; CHECK-LE: sbcs {{[^,]+}}, r2, [[REG2]]
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; CHECK-BE: sbcs {{[^,]+}}, r1, [[REG1]]
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; CHECK: mov [[CMP:[a-z0-9]+]], #0
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; CHECK: movwge [[CMP]], #1
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; CHECK: cmp [[CMP]], #0
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; CHECK: movne [[OUT_HI]], [[REG2]]
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; CHECK: mov [[OUT_LO:[a-z0-9]+]], r1
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; CHECK: movne [[OUT_LO]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test10:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB: mov [[OUT_LO:[a-z0-9]+]], r2
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; CHECK-THUMB-LE: subs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB-BE: subs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-LE: sbcs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-BE: sbcs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB: mov.w [[CMP:[a-z0-9]+]], #0
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; CHECK-THUMB: movge.w [[CMP]], #1
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; CHECK-THUMB: cmp.w [[CMP]], #0
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; CHECK-THUMB: mov [[OUT_HI:[a-z0-9]+]], r3
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; CHECK-THUMB: movne [[OUT_HI]], [[REG2]]
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; CHECK-THUMB: movne [[OUT_LO]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw min i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test11(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test11:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK: mov [[OUT_HI:[a-z0-9]+]], r2
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; CHECK-LE: subs {{[^,]+}}, r1, [[REG1]]
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; CHECK-BE: subs {{[^,]+}}, r2, [[REG2]]
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; CHECK-LE: sbcs {{[^,]+}}, r2, [[REG2]]
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; CHECK-BE: sbcs {{[^,]+}}, r1, [[REG1]]
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; CHECK: mov [[CMP:[a-z0-9]+]], #0
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; CHECK: movwhs [[CMP]], #1
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; CHECK: cmp [[CMP]], #0
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; CHECK: movne [[OUT_HI]], [[REG2]]
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; CHECK: mov [[OUT_LO:[a-z0-9]+]], r1
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; CHECK: movne [[OUT_LO]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test11:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB: mov [[OUT_LO:[a-z0-9]+]], r2
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; CHECK-THUMB-LE: subs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB-BE: subs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-LE: sbcs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-BE: sbcs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB: mov.w [[CMP:[a-z0-9]+]], #0
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; CHECK-THUMB: movhs.w [[CMP]], #1
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; CHECK-THUMB: cmp.w [[CMP]], #0
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; CHECK-THUMB: mov [[OUT_HI:[a-z0-9]+]], r3
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; CHECK-THUMB: movne [[OUT_HI]], [[REG2]]
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; CHECK-THUMB: movne [[OUT_LO]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw umin i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test12(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test12:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK: mov [[OUT_HI:[a-z0-9]+]], r2
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; CHECK-LE: subs {{[^,]+}}, r1, [[REG1]]
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; CHECK-BE: subs {{[^,]+}}, r2, [[REG2]]
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; CHECK-LE: sbcs {{[^,]+}}, r2, [[REG2]]
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; CHECK-BE: sbcs {{[^,]+}}, r1, [[REG1]]
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; CHECK: mov [[CMP:[a-z0-9]+]], #0
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; CHECK: movwlt [[CMP]], #1
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; CHECK: cmp [[CMP]], #0
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; CHECK: movne [[OUT_HI]], [[REG2]]
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; CHECK: mov [[OUT_LO:[a-z0-9]+]], r1
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; CHECK: movne [[OUT_LO]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test12:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB: mov [[OUT_LO:[a-z0-9]+]], r2
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; CHECK-THUMB-LE: subs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB-BE: subs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-LE: sbcs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-BE: sbcs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB: mov.w [[CMP:[a-z0-9]+]], #0
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; CHECK-THUMB: movlt.w [[CMP]], #1
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; CHECK-THUMB: cmp.w [[CMP]], #0
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; CHECK-THUMB: mov [[OUT_HI:[a-z0-9]+]], r3
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; CHECK-THUMB: movne [[OUT_HI]], [[REG2]]
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; CHECK-THUMB: movne [[OUT_LO]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw max i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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define i64 @test13(i64* %ptr, i64 %val) {
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; CHECK-LABEL: test13:
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; CHECK: dmb {{ish$}}
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; CHECK: ldrexd [[REG1:(r[0-9]?[02468])]], [[REG2:(r[0-9]?[13579])]]
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; CHECK: mov [[OUT_HI:[a-z0-9]+]], r2
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; CHECK-LE: subs {{[^,]+}}, r1, [[REG1]]
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; CHECK-BE: subs {{[^,]+}}, r2, [[REG2]]
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; CHECK-LE: sbcs {{[^,]+}}, r2, [[REG2]]
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; CHECK-BE: sbcs {{[^,]+}}, r1, [[REG1]]
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; CHECK: mov [[CMP:[a-z0-9]+]], #0
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; CHECK: movwlo [[CMP]], #1
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; CHECK: cmp [[CMP]], #0
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; CHECK: movne [[OUT_HI]], [[REG2]]
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; CHECK: mov [[OUT_LO:[a-z0-9]+]], r1
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; CHECK: movne [[OUT_LO]], [[REG1]]
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; CHECK: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK: cmp
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; CHECK: bne
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; CHECK: dmb {{ish$}}
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; CHECK-THUMB-LABEL: test13:
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; CHECK-THUMB: dmb {{ish$}}
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; CHECK-THUMB: ldrexd [[REG1:[a-z0-9]+]], [[REG2:[a-z0-9]+]]
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; CHECK-THUMB: mov [[OUT_LO:[a-z0-9]+]], r2
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; CHECK-THUMB-LE: subs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB-BE: subs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-LE: sbcs.w {{[^,]+}}, r3, [[REG2]]
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; CHECK-THUMB-BE: sbcs.w {{[^,]+}}, r2, [[REG1]]
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; CHECK-THUMB: mov.w [[CMP:[a-z0-9]+]], #0
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; CHECK-THUMB: movlo.w [[CMP]], #1
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; CHECK-THUMB: cmp.w [[CMP]], #0
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; CHECK-THUMB: mov [[OUT_HI:[a-z0-9]+]], r3
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; CHECK-THUMB: movne [[OUT_HI]], [[REG2]]
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; CHECK-THUMB: movne [[OUT_LO]], [[REG1]]
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; CHECK-THUMB: strexd {{[a-z0-9]+}}, [[OUT_LO]], [[OUT_HI]]
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; CHECK-THUMB: cmp
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; CHECK-THUMB: bne
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; CHECK-THUMB: dmb {{ish$}}
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%r = atomicrmw umax i64* %ptr, i64 %val seq_cst
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ret i64 %r
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}
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