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126 lines
3.4 KiB
126 lines
3.4 KiB
4 months ago
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; Test sibling calls.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare void @ok(i8 %r2, i16 %r3, i32 %r4, i64 %r5, float %f0, double %f2,
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float %f4, double %f6)
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declare void @uses_r6(i8 %r2, i16 %r3, i32 %r4, i64 %r5, i64 %r6)
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declare void @uses_indirect(fp128 %r2)
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declare void @uses_stack(float %f0, float %f2, float %f4, float %f6,
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float %stack)
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declare i32 @returns_i32()
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declare i64 @returns_i64()
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; Check the maximum number of arguments that we can pass and still use
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; a sibling call.
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define void @f1() {
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; CHECK-LABEL: f1:
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; CHECK-DAG: lzer %f0
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; CHECK-DAG: lzdr %f2
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; CHECK-DAG: lhi %r2, 1
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; CHECK-DAG: lhi %r3, 2
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; CHECK-DAG: lhi %r4, 3
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; CHECK-DAG: lghi %r5, 4
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; CHECK-DAG: {{ler %f4, %f0|lzer %f4}}
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; CHECK-DAG: {{ldr %f6, %f2|lzdr %f6}}
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; CHECK: jg ok@PLT
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tail call void @ok(i8 1, i16 2, i32 3, i64 4, float 0.0, double 0.0,
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float 0.0, double 0.0)
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ret void
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}
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; Check a call that uses %r6 to pass an argument. At the moment we don't
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; use sibling calls in that case.
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define void @f2() {
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; CHECK-LABEL: f2:
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; CHECK: brasl %r14, uses_r6@PLT
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; CHECK: br %r14
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tail call void @uses_r6(i8 1, i16 2, i32 3, i64 4, i64 5)
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ret void
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}
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; Check a call that passes indirect arguments. We can't use sibling
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; calls in that case.
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define void @f3() {
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; CHECK-LABEL: f3:
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; CHECK: brasl %r14, uses_indirect@PLT
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; CHECK: br %r14
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tail call void @uses_indirect(fp128 0xL00000000000000000000000000000000)
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ret void
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}
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; Check a call that uses direct stack arguments, which again prevents
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; sibling calls
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define void @f4() {
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; CHECK-LABEL: f4:
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; CHECK: brasl %r14, uses_stack@PLT
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; CHECK: br %r14
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tail call void @uses_stack(float 0.0, float 0.0, float 0.0, float 0.0,
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float 0.0)
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ret void
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}
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; Check an indirect call. In this case the only acceptable choice for
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; the target register is %r1.
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define void @f5(void(i32, i32, i32, i32) *%foo) {
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; CHECK-LABEL: f5:
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; CHECK: lgr %r1, %r2
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; CHECK-DAG: lhi %r2, 1
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; CHECK-DAG: lhi %r3, 2
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; CHECK-DAG: lhi %r4, 3
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; CHECK-DAG: lhi %r5, 4
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; CHECK: br %r1
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tail call void %foo(i32 1, i32 2, i32 3, i32 4)
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ret void
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}
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; Check an indirect call that will be forced into a call-saved GPR
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; (which should be %r13, the highest GPR not used for anything else).
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define void @f6(void(i32) *%foo) {
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; CHECK-LABEL: f6:
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; CHECK: stmg %r13, %r15, 104(%r15)
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; CHECK: lgr %r13, %r2
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; CHECK: brasl %r14, returns_i32
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; CHECK: lgr %r1, %r13
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; CHECK: lmg %r13, %r15, 264(%r15)
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; CHECK: br %r1
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%arg = call i32 @returns_i32()
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tail call void %foo(i32 %arg)
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ret void
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}
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; Test a function that returns a value.
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define i64 @f7() {
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; CHECK-LABEL: f7:
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; CHECK: jg returns_i64@PLT
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%res = tail call i64 @returns_i64()
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ret i64 %res
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}
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; Test a function that returns a value truncated from i64 to i32.
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define i32 @f8() {
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; CHECK-LABEL: f8:
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; CHECK: jg returns_i64@PLT
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%res = tail call i64 @returns_i64()
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%trunc = trunc i64 %res to i32
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ret i32 %trunc
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}
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; Test a function that returns a value truncated from i64 to i7.
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define i7 @f9() {
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; CHECK-LABEL: f9:
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; CHECK: jg returns_i64@PLT
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%res = tail call i64 @returns_i64()
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%trunc = trunc i64 %res to i7
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ret i7 %trunc
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}
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; Test a function that returns a value truncated from i32 to i8.
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define i8 @f10() {
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; CHECK-LABEL: f10:
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; CHECK: jg returns_i32@PLT
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%res = tail call i32 @returns_i32()
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%trunc = trunc i32 %res to i8
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ret i8 %trunc
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}
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