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172d0b6bb7
This was requested in D13076: if we're going to canonicalize to fabs(), ValueTracking should know that fabs() clears sign bits. In this patch (as in D13076), we're not handling vectors yet even though computeKnownBits' fabs() case itself should be vector-ready via the splat in this patch. Fixing this will require follow-on patches to correct other logic that uses 'getScalarType'. Differential Revision: http://reviews.llvm.org/D13222 llvm-svn: 249701
126 lines
3.5 KiB
LLVM
126 lines
3.5 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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; Make sure all library calls are eliminated when the input is known positive.
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declare float @fabsf(float)
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declare double @fabs(double)
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declare fp128 @fabsl(fp128)
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define float @square_fabs_call_f32(float %x) {
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%mul = fmul float %x, %x
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%fabsf = tail call float @fabsf(float %mul)
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ret float %fabsf
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; CHECK-LABEL: square_fabs_call_f32(
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; CHECK-NEXT: %mul = fmul float %x, %x
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; CHECK-NEXT: ret float %mul
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}
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define double @square_fabs_call_f64(double %x) {
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%mul = fmul double %x, %x
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%fabs = tail call double @fabs(double %mul)
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ret double %fabs
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; CHECK-LABEL: square_fabs_call_f64(
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; CHECK-NEXT: %mul = fmul double %x, %x
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; CHECK-NEXT: ret double %mul
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}
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define fp128 @square_fabs_call_f128(fp128 %x) {
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%mul = fmul fp128 %x, %x
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%fabsl = tail call fp128 @fabsl(fp128 %mul)
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ret fp128 %fabsl
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; CHECK-LABEL: square_fabs_call_f128(
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; CHECK-NEXT: %mul = fmul fp128 %x, %x
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; CHECK-NEXT: ret fp128 %mul
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}
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; Make sure all intrinsic calls are eliminated when the input is known positive.
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declare float @llvm.fabs.f32(float)
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declare double @llvm.fabs.f64(double)
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declare fp128 @llvm.fabs.f128(fp128)
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declare <4 x float> @llvm.fabs.v4f32(<4 x float>)
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define float @square_fabs_intrinsic_f32(float %x) {
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%mul = fmul float %x, %x
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%fabsf = tail call float @llvm.fabs.f32(float %mul)
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ret float %fabsf
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; CHECK-LABEL: square_fabs_intrinsic_f32(
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; CHECK-NEXT: %mul = fmul float %x, %x
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; CHECK-NEXT: ret float %mul
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}
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define double @square_fabs_intrinsic_f64(double %x) {
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%mul = fmul double %x, %x
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%fabs = tail call double @llvm.fabs.f64(double %mul)
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ret double %fabs
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; CHECK-LABEL: square_fabs_intrinsic_f64(
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; CHECK-NEXT: %mul = fmul double %x, %x
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; CHECK-NEXT: ret double %mul
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}
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define fp128 @square_fabs_intrinsic_f128(fp128 %x) {
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%mul = fmul fp128 %x, %x
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%fabsl = tail call fp128 @llvm.fabs.f128(fp128 %mul)
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ret fp128 %fabsl
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; CHECK-LABEL: square_fabs_intrinsic_f128(
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; CHECK-NEXT: %mul = fmul fp128 %x, %x
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; CHECK-NEXT: ret fp128 %mul
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}
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; Shrinking a library call to a smaller type should not be inhibited by nor inhibit the square optimization.
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define float @square_fabs_shrink_call1(float %x) {
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%ext = fpext float %x to double
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%sq = fmul double %ext, %ext
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%fabs = call double @fabs(double %sq)
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%trunc = fptrunc double %fabs to float
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ret float %trunc
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; CHECK-LABEL: square_fabs_shrink_call1(
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; CHECK-NEXT: %trunc = fmul float %x, %x
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; CHECK-NEXT: ret float %trunc
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}
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define float @square_fabs_shrink_call2(float %x) {
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%sq = fmul float %x, %x
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%ext = fpext float %sq to double
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%fabs = call double @fabs(double %ext)
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%trunc = fptrunc double %fabs to float
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ret float %trunc
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; CHECK-LABEL: square_fabs_shrink_call2(
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; CHECK-NEXT: %sq = fmul float %x, %x
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; CHECK-NEXT: ret float %sq
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}
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; A scalar fabs op makes the sign bit zero, so masking off all of the other bits means we can return zero.
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define i32 @fabs_value_tracking_f32(float %x) {
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%call = call float @llvm.fabs.f32(float %x)
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%bc = bitcast float %call to i32
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%and = and i32 %bc, 2147483648
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ret i32 %and
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; CHECK-LABEL: fabs_value_tracking_f32(
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; CHECK: ret i32 0
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}
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; TODO: A vector fabs op makes the sign bits zero, so masking off all of the other bits means we can return zero.
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define <4 x i32> @fabs_value_tracking_v4f32(<4 x float> %x) {
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%call = call <4 x float> @llvm.fabs.v4f32(<4 x float> %x)
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%bc = bitcast <4 x float> %call to <4 x i32>
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%and = and <4 x i32> %bc, <i32 2147483648, i32 2147483648, i32 2147483648, i32 2147483648>
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ret <4 x i32> %and
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; CHECK-LABEL: fabs_value_tracking_v4f32(
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; CHECK: ret <4 x i32> %and
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}
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