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117 lines
3.1 KiB
117 lines
3.1 KiB
4 months ago
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; Test that compares are omitted if CC already has the right value
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; (z196 version).
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 -no-integrated-as | FileCheck %s
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; Addition provides enough for comparisons with zero if we know no
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; signed overflow happens, which is when the "nsw" flag is set.
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; First test the EQ case with LOC.
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define i32 @f1(i32 %a, i32 %b, i32 *%cptr) {
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; CHECK-LABEL: f1:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: loce %r3, 0(%r4)
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp eq i32 %add, 0
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%c = load i32, i32 *%cptr
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%arg = select i1 %cmp, i32 %c, i32 %b
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call void asm sideeffect "blah $0", "{r3}"(i32 %arg)
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ret i32 %add
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}
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; ...and again with STOC.
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define i32 @f2(i32 %a, i32 %b, i32 *%cptr) {
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; CHECK-LABEL: f2:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: stoce %r3, 0(%r4)
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp eq i32 %add, 0
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%c = load i32, i32 *%cptr
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%newval = select i1 %cmp, i32 %b, i32 %c
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store i32 %newval, i32 *%cptr
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ret i32 %add
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}
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; Reverse the select order and test with LOCR.
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define i32 @f3(i32 %a, i32 %b, i32 %c) {
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; CHECK-LABEL: f3:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: locrlh %r3, %r4
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp eq i32 %add, 0
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%arg = select i1 %cmp, i32 %b, i32 %c
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call void asm sideeffect "blah $0", "{r3}"(i32 %arg)
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ret i32 %add
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}
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; ...and again with LOC.
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define i32 @f4(i32 %a, i32 %b, i32 *%cptr) {
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; CHECK-LABEL: f4:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: loclh %r3, 0(%r4)
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp eq i32 %add, 0
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%c = load i32, i32 *%cptr
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%arg = select i1 %cmp, i32 %b, i32 %c
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call void asm sideeffect "blah $0", "{r3}"(i32 %arg)
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ret i32 %add
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}
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; ...and again with STOC.
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define i32 @f5(i32 %a, i32 %b, i32 *%cptr) {
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; CHECK-LABEL: f5:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: stoclh %r3, 0(%r4)
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp eq i32 %add, 0
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%c = load i32, i32 *%cptr
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%newval = select i1 %cmp, i32 %c, i32 %b
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store i32 %newval, i32 *%cptr
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ret i32 %add
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}
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; Change the EQ in f3 to NE.
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define i32 @f6(i32 %a, i32 %b, i32 %c) {
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; CHECK-LABEL: f6:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: locre %r3, %r4
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp ne i32 %add, 0
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%arg = select i1 %cmp, i32 %b, i32 %c
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call void asm sideeffect "blah $0", "{r3}"(i32 %arg)
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ret i32 %add
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}
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; ...and again with LOC.
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define i32 @f7(i32 %a, i32 %b, i32 *%cptr) {
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; CHECK-LABEL: f7:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: loce %r3, 0(%r4)
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp ne i32 %add, 0
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%c = load i32, i32 *%cptr
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%arg = select i1 %cmp, i32 %b, i32 %c
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call void asm sideeffect "blah $0", "{r3}"(i32 %arg)
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ret i32 %add
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}
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; ...and again with STOC.
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define i32 @f8(i32 %a, i32 %b, i32 *%cptr) {
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; CHECK-LABEL: f8:
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; CHECK: afi %r2, 1000000
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; CHECK-NEXT: stoce %r3, 0(%r4)
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; CHECK: br %r14
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%add = add nsw i32 %a, 1000000
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%cmp = icmp ne i32 %add, 0
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%c = load i32, i32 *%cptr
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%newval = select i1 %cmp, i32 %c, i32 %b
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store i32 %newval, i32 *%cptr
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ret i32 %add
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}
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