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Identify and simplify idempotent intrinsics. Test case included.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174650 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Ilseman
2013-02-07 19:26:05 +00:00
parent 96a6555b57
commit f89de816ae
2 changed files with 87 additions and 0 deletions
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test/Transforms/InstSimplify/call.ll
+51
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@@ -50,3 +50,54 @@ define float @test_fabs_libcall() {
ret float %x
; CHECK-NEXT: ret float 4.2{{0+}}e+01
}
declare float @llvm.fabs.f32(float) nounwind readnone
declare float @llvm.floor.f32(float) nounwind readnone
declare float @llvm.ceil.f32(float) nounwind readnone
declare float @llvm.trunc.f32(float) nounwind readnone
declare float @llvm.rint.f32(float) nounwind readnone
declare float @llvm.nearbyint.f32(float) nounwind readnone
; Test idempotent intrinsics
define float @test_idempotence(float %a) {
; CHECK: @test_idempotence
; CHECK: fabs
; CHECK-NOT: fabs
%a0 = call float @llvm.fabs.f32(float %a)
%a1 = call float @llvm.fabs.f32(float %a0)
; CHECK: floor
; CHECK-NOT: floor
%b0 = call float @llvm.floor.f32(float %a)
%b1 = call float @llvm.floor.f32(float %b0)
; CHECK: ceil
; CHECK-NOT: ceil
%c0 = call float @llvm.ceil.f32(float %a)
%c1 = call float @llvm.ceil.f32(float %c0)
; CHECK: trunc
; CHECK-NOT: trunc
%d0 = call float @llvm.trunc.f32(float %a)
%d1 = call float @llvm.trunc.f32(float %d0)
; CHECK: rint
; CHECK-NOT: rint
%e0 = call float @llvm.rint.f32(float %a)
%e1 = call float @llvm.rint.f32(float %e0)
; CHECK: nearbyint
; CHECK-NOT: nearbyint
%f0 = call float @llvm.nearbyint.f32(float %a)
%f1 = call float @llvm.nearbyint.f32(float %f0)
%r0 = fadd float %a1, %b1
%r1 = fadd float %r0, %c1
%r2 = fadd float %r1, %d1
%r3 = fadd float %r2, %e1
%r4 = fadd float %r3, %f1
ret float %r4
}