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llvm-mirror/test/Transforms/InstCombine/vector-reductions.ll
Sanjay Patel d6c0ccc19e [InstCombine] reassociate diff of sums into sum of diffs 
This is the integer sibling to D81491.

(a[0] + a[1] + a[2] + a[3]) - (b[0] + b[1] + b[2] +b[3]) -->
(a[0] - b[0]) + (a[1] - b[1]) + (a[2] - b[2]) + (a[3] - b[3])

Removing the "experimental" from these intrinsics is likely
not too far away.
2020-06-22 20:47:09 -04:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
declare float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float, <4 x float>)
declare float @llvm.experimental.vector.reduce.v2.fadd.f32.v8f32(float, <8 x float>)
declare void @use_f32(float)
declare i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32>)
declare i32 @llvm.experimental.vector.reduce.add.v8i32(<8 x i32>)
declare void @use_i32(i32)
define float @diff_of_sums_v4f32(float %a0, <4 x float> %v0, float %a1, <4 x float> %v1) {
; CHECK-LABEL: @diff_of_sums_v4f32(
; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc nsz <4 x float> [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = call reassoc nsz float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A0:%.*]], <4 x float> [[TMP1]])
; CHECK-NEXT: [[R:%.*]] = fsub reassoc nsz float [[TMP2]], [[A1:%.*]]
; CHECK-NEXT: ret float [[R]]
;
%r0 = call float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a0, <4 x float> %v0)
%r1 = call float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a1, <4 x float> %v1)
%r = fsub reassoc nsz float %r0, %r1
ret float %r
}
; negative test - fsub must allow reassociation
define float @diff_of_sums_v4f32_fmf(float %a0, <4 x float> %v0, float %a1, <4 x float> %v1) {
; CHECK-LABEL: @diff_of_sums_v4f32_fmf(
; CHECK-NEXT: [[R0:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A0:%.*]], <4 x float> [[V0:%.*]])
; CHECK-NEXT: [[R1:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A1:%.*]], <4 x float> [[V1:%.*]])
; CHECK-NEXT: [[R:%.*]] = fsub nnan ninf nsz float [[R0]], [[R1]]
; CHECK-NEXT: ret float [[R]]
;
%r0 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a0, <4 x float> %v0)
%r1 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a1, <4 x float> %v1)
%r = fsub ninf nnan nsz float %r0, %r1
ret float %r
}
; negative test - extra uses could create extra instructions
define float @diff_of_sums_extra_use1(float %a0, <4 x float> %v0, float %a1, <4 x float> %v1) {
; CHECK-LABEL: @diff_of_sums_extra_use1(
; CHECK-NEXT: [[R0:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A0:%.*]], <4 x float> [[V0:%.*]])
; CHECK-NEXT: call void @use_f32(float [[R0]])
; CHECK-NEXT: [[R1:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A1:%.*]], <4 x float> [[V1:%.*]])
; CHECK-NEXT: [[R:%.*]] = fsub fast float [[R0]], [[R1]]
; CHECK-NEXT: ret float [[R]]
;
%r0 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a0, <4 x float> %v0)
call void @use_f32(float %r0)
%r1 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a1, <4 x float> %v1)
%r = fsub fast float %r0, %r1
ret float %r
}
; negative test - extra uses could create extra instructions
define float @diff_of_sums_extra_use2(float %a0, <4 x float> %v0, float %a1, <4 x float> %v1) {
; CHECK-LABEL: @diff_of_sums_extra_use2(
; CHECK-NEXT: [[R0:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A0:%.*]], <4 x float> [[V0:%.*]])
; CHECK-NEXT: [[R1:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A1:%.*]], <4 x float> [[V1:%.*]])
; CHECK-NEXT: call void @use_f32(float [[R1]])
; CHECK-NEXT: [[R:%.*]] = fsub fast float [[R0]], [[R1]]
; CHECK-NEXT: ret float [[R]]
;
%r0 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a0, <4 x float> %v0)
%r1 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a1, <4 x float> %v1)
call void @use_f32(float %r1)
%r = fsub fast float %r0, %r1
ret float %r
}
; negative test - can't reassociate different vector types
define float @diff_of_sums_type_mismatch(float %a0, <4 x float> %v0, float %a1, <8 x float> %v1) {
; CHECK-LABEL: @diff_of_sums_type_mismatch(
; CHECK-NEXT: [[R0:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float [[A0:%.*]], <4 x float> [[V0:%.*]])
; CHECK-NEXT: [[R1:%.*]] = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v8f32(float [[A1:%.*]], <8 x float> [[V1:%.*]])
; CHECK-NEXT: [[R:%.*]] = fsub fast float [[R0]], [[R1]]
; CHECK-NEXT: ret float [[R]]
;
%r0 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v4f32(float %a0, <4 x float> %v0)
%r1 = call fast float @llvm.experimental.vector.reduce.v2.fadd.f32.v8f32(float %a1, <8 x float> %v1)
%r = fsub fast float %r0, %r1
ret float %r
}
define i32 @diff_of_sums_v4i32(<4 x i32> %v0, <4 x i32> %v1) {
; CHECK-LABEL: @diff_of_sums_v4i32(
; CHECK-NEXT: [[TMP1:%.*]] = sub <4 x i32> [[V0:%.*]], [[V1:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> [[TMP1]])
; CHECK-NEXT: ret i32 [[TMP2]]
;
%r0 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v0)
%r1 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v1)
%r = sub i32 %r0, %r1
ret i32 %r
}
; negative test - extra uses could create extra instructions
define i32 @diff_of_sums_v4i32_extra_use1(<4 x i32> %v0, <4 x i32> %v1) {
; CHECK-LABEL: @diff_of_sums_v4i32_extra_use1(
; CHECK-NEXT: [[R0:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> [[V0:%.*]])
; CHECK-NEXT: call void @use_i32(i32 [[R0]])
; CHECK-NEXT: [[R1:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> [[V1:%.*]])
; CHECK-NEXT: [[R:%.*]] = sub i32 [[R0]], [[R1]]
; CHECK-NEXT: ret i32 [[R]]
;
%r0 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v0)
call void @use_i32(i32 %r0)
%r1 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v1)
%r = sub i32 %r0, %r1
ret i32 %r
}
; negative test - extra uses could create extra instructions
define i32 @diff_of_sums_v4i32_extra_use2(<4 x i32> %v0, <4 x i32> %v1) {
; CHECK-LABEL: @diff_of_sums_v4i32_extra_use2(
; CHECK-NEXT: [[R0:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> [[V0:%.*]])
; CHECK-NEXT: [[R1:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> [[V1:%.*]])
; CHECK-NEXT: call void @use_i32(i32 [[R1]])
; CHECK-NEXT: [[R:%.*]] = sub i32 [[R0]], [[R1]]
; CHECK-NEXT: ret i32 [[R]]
;
%r0 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v0)
%r1 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v1)
call void @use_i32(i32 %r1)
%r = sub i32 %r0, %r1
ret i32 %r
}
; negative test - can't reassociate different vector types
define i32 @diff_of_sums_type_mismatch2(<8 x i32> %v0, <4 x i32> %v1) {
; CHECK-LABEL: @diff_of_sums_type_mismatch2(
; CHECK-NEXT: [[R0:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v8i32(<8 x i32> [[V0:%.*]])
; CHECK-NEXT: [[R1:%.*]] = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> [[V1:%.*]])
; CHECK-NEXT: [[R:%.*]] = sub i32 [[R0]], [[R1]]
; CHECK-NEXT: ret i32 [[R]]
;
%r0 = call i32 @llvm.experimental.vector.reduce.add.v8i32(<8 x i32> %v0)
%r1 = call i32 @llvm.experimental.vector.reduce.add.v4i32(<4 x i32> %v1)
%r = sub i32 %r0, %r1
ret i32 %r
}
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