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821bba7fda
We were missing a check for the following fold in DAGCombiner: // fold (fmul (fmul x, c1), c2) -> (fmul x, (fmul c1, c2)) If 'x' is also a constant, then we shouldn't do anything. Otherwise, we could end up swapping the operands back and forth forever. This should fix: http://llvm.org/bugs/show_bug.cgi?id=22698 Differential Revision: http://reviews.llvm.org/D7917 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230884 91177308-0d34-0410-b5e6-96231b3b80d8
182 lines
5.7 KiB
LLVM
182 lines
5.7 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-unknown -march=x86-64 < %s | FileCheck %s
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; CHECK-LABEL: fmul2_f32:
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; CHECK: addss %xmm0, %xmm0
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define float @fmul2_f32(float %x) {
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%y = fmul float %x, 2.0
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ret float %y
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}
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; fmul 2.0, x -> fadd x, x for vectors.
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; CHECK-LABEL: fmul2_v4f32:
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; CHECK: addps %xmm0, %xmm0
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; CHECK-NEXT: retq
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define <4 x float> @fmul2_v4f32(<4 x float> %x) {
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%y = fmul <4 x float> %x, <float 2.0, float 2.0, float 2.0, float 2.0>
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ret <4 x float> %y
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}
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; CHECK-LABEL: constant_fold_fmul_v4f32:
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; CHECK: movaps
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; CHECK-NEXT: ret
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define <4 x float> @constant_fold_fmul_v4f32(<4 x float> %x) {
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%y = fmul <4 x float> <float 4.0, float 4.0, float 4.0, float 4.0>, <float 2.0, float 2.0, float 2.0, float 2.0>
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ret <4 x float> %y
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}
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; CHECK-LABEL: fmul0_v4f32:
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; CHECK: xorps %xmm0, %xmm0
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; CHECK-NEXT: retq
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define <4 x float> @fmul0_v4f32(<4 x float> %x) #0 {
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%y = fmul <4 x float> %x, <float 0.0, float 0.0, float 0.0, float 0.0>
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ret <4 x float> %y
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}
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; CHECK-LABEL: fmul_c2_c4_v4f32:
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; CHECK-NOT: addps
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; CHECK: mulps
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; CHECK-NOT: mulps
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; CHECK-NEXT: ret
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define <4 x float> @fmul_c2_c4_v4f32(<4 x float> %x) #0 {
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%y = fmul <4 x float> %x, <float 2.0, float 2.0, float 2.0, float 2.0>
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%z = fmul <4 x float> %y, <float 4.0, float 4.0, float 4.0, float 4.0>
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ret <4 x float> %z
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}
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; CHECK-LABEL: fmul_c3_c4_v4f32:
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; CHECK-NOT: addps
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; CHECK: mulps
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; CHECK-NOT: mulps
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; CHECK-NEXT: ret
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define <4 x float> @fmul_c3_c4_v4f32(<4 x float> %x) #0 {
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%y = fmul <4 x float> %x, <float 3.0, float 3.0, float 3.0, float 3.0>
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%z = fmul <4 x float> %y, <float 4.0, float 4.0, float 4.0, float 4.0>
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ret <4 x float> %z
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}
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; We should be able to pre-multiply the two constant vectors.
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; CHECK: float 5.000000e+00
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; CHECK: float 1.200000e+01
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; CHECK: float 2.100000e+01
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; CHECK: float 3.200000e+01
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; CHECK-LABEL: fmul_v4f32_two_consts_no_splat:
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; CHECK: mulps
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; CHECK-NOT: mulps
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; CHECK-NEXT: ret
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define <4 x float> @fmul_v4f32_two_consts_no_splat(<4 x float> %x) #0 {
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%y = fmul <4 x float> %x, <float 1.0, float 2.0, float 3.0, float 4.0>
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%z = fmul <4 x float> %y, <float 5.0, float 6.0, float 7.0, float 8.0>
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ret <4 x float> %z
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}
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; Same as above, but reverse operands to make sure non-canonical form is also handled.
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; CHECK: float 5.000000e+00
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; CHECK: float 1.200000e+01
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; CHECK: float 2.100000e+01
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; CHECK: float 3.200000e+01
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; CHECK-LABEL: fmul_v4f32_two_consts_no_splat_non_canonical:
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; CHECK: mulps
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; CHECK-NOT: mulps
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; CHECK-NEXT: ret
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define <4 x float> @fmul_v4f32_two_consts_no_splat_non_canonical(<4 x float> %x) #0 {
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%y = fmul <4 x float> <float 1.0, float 2.0, float 3.0, float 4.0>, %x
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%z = fmul <4 x float> <float 5.0, float 6.0, float 7.0, float 8.0>, %y
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ret <4 x float> %z
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}
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; More than one use of a constant multiply should not inhibit the optimization.
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; Instead of a chain of 2 dependent mults, this test will have 2 independent mults.
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; CHECK: float 5.000000e+00
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; CHECK: float 1.200000e+01
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; CHECK: float 2.100000e+01
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; CHECK: float 3.200000e+01
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; CHECK-LABEL: fmul_v4f32_two_consts_no_splat_multiple_use:
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; CHECK: mulps
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; CHECK: mulps
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; CHECK: addps
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; CHECK: ret
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define <4 x float> @fmul_v4f32_two_consts_no_splat_multiple_use(<4 x float> %x) #0 {
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%y = fmul <4 x float> %x, <float 1.0, float 2.0, float 3.0, float 4.0>
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%z = fmul <4 x float> %y, <float 5.0, float 6.0, float 7.0, float 8.0>
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%a = fadd <4 x float> %y, %z
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ret <4 x float> %a
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}
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; PR22698 - http://llvm.org/bugs/show_bug.cgi?id=22698
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; Make sure that we don't infinite loop swapping constants back and forth.
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define <4 x float> @PR22698_splats(<4 x float> %a) #0 {
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%mul1 = fmul fast <4 x float> <float 2.0, float 2.0, float 2.0, float 2.0>, <float 3.0, float 3.0, float 3.0, float 3.0>
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%mul2 = fmul fast <4 x float> <float 4.0, float 4.0, float 4.0, float 4.0>, %mul1
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%mul3 = fmul fast <4 x float> %a, %mul2
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ret <4 x float> %mul3
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; CHECK: float 2.400000e+01
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; CHECK: float 2.400000e+01
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; CHECK: float 2.400000e+01
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; CHECK: float 2.400000e+01
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; CHECK-LABEL: PR22698_splats:
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; CHECK: mulps
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; CHECK: ret
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}
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; Same as above, but verify that non-splat vectors are handled correctly too.
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define <4 x float> @PR22698_no_splats(<4 x float> %a) #0 {
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%mul1 = fmul fast <4 x float> <float 1.0, float 2.0, float 3.0, float 4.0>, <float 5.0, float 6.0, float 7.0, float 8.0>
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%mul2 = fmul fast <4 x float> <float 9.0, float 10.0, float 11.0, float 12.0>, %mul1
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%mul3 = fmul fast <4 x float> %a, %mul2
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ret <4 x float> %mul3
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; CHECK: float 4.500000e+01
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; CHECK: float 1.200000e+02
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; CHECK: float 2.310000e+02
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; CHECK: float 3.840000e+02
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; CHECK-LABEL: PR22698_no_splats:
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; CHECK: mulps
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; CHECK: ret
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}
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; CHECK-LABEL: fmul_c2_c4_f32:
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; CHECK-NOT: addss
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; CHECK: mulss
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; CHECK-NOT: mulss
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; CHECK-NEXT: ret
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define float @fmul_c2_c4_f32(float %x) #0 {
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%y = fmul float %x, 2.0
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%z = fmul float %y, 4.0
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ret float %z
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}
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; CHECK-LABEL: fmul_c3_c4_f32:
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; CHECK-NOT: addss
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; CHECK: mulss
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; CHECK-NOT: mulss
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; CHECK-NET: ret
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define float @fmul_c3_c4_f32(float %x) #0 {
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%y = fmul float %x, 3.0
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%z = fmul float %y, 4.0
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ret float %z
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}
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; CHECK-LABEL: fmul_fneg_fneg_f32:
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; CHECK: mulss %xmm1, %xmm0
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; CHECK-NEXT: retq
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define float @fmul_fneg_fneg_f32(float %x, float %y) {
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%x.neg = fsub float -0.0, %x
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%y.neg = fsub float -0.0, %y
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%mul = fmul float %x.neg, %y.neg
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ret float %mul
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}
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; CHECK-LABEL: fmul_fneg_fneg_v4f32:
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; CHECK: mulps {{%xmm1|\(%rdx\)}}, %xmm0
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; CHECK-NEXT: retq
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define <4 x float> @fmul_fneg_fneg_v4f32(<4 x float> %x, <4 x float> %y) {
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%x.neg = fsub <4 x float> <float -0.0, float -0.0, float -0.0, float -0.0>, %x
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%y.neg = fsub <4 x float> <float -0.0, float -0.0, float -0.0, float -0.0>, %y
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%mul = fmul <4 x float> %x.neg, %y.neg
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ret <4 x float> %mul
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}
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attributes #0 = { "less-precise-fpmad"="true" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "unsafe-fp-math"="true" }
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