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Summary: x / fabs(x) -> copysign(1.0, x) fabs(x) / x -> copysign(1.0, x) Reviewers: spatel, foad, RKSimon, efriedma Reviewed By: spatel Subscribers: lebedev.ri, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D65898 llvm-svn: 368570
120 lines
4.3 KiB
LLVM
120 lines
4.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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declare double @llvm.fabs.f64(double)
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declare float @llvm.fabs.f32(float)
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declare <4 x double> @llvm.fabs.v4f64(<4 x double>)
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declare void @use(double)
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declare double @llvm.copysign.f64(double, double)
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declare float @llvm.copysign.f32(float, float)
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define double @fabs_copysign(double %x) {
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; CHECK-LABEL: @fabs_copysign(
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; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf double @llvm.copysign.f64(double 1.000000e+00, double [[X:%.*]])
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; CHECK-NEXT: ret double [[TMP1]]
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;
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%f = tail call double @llvm.fabs.f64(double %x)
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%div = fdiv nnan ninf double %x, %f
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ret double %div
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}
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define double @fabs_copysign_commuted(double %x) {
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; CHECK-LABEL: @fabs_copysign_commuted(
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; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf double @llvm.copysign.f64(double 1.000000e+00, double [[X:%.*]])
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; CHECK-NEXT: ret double [[TMP1]]
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;
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%f = tail call double @llvm.fabs.f64(double %x)
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%div = fdiv nnan ninf double %f, %x
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ret double %div
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}
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define <4 x double> @fabs_copysign_vec(<4 x double> %x) {
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; CHECK-LABEL: @fabs_copysign_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf <4 x double> @llvm.copysign.v4f64(<4 x double> <double 1.000000e+00, double 1.000000e+00, double 1.000000e+00, double 1.000000e+00>, <4 x double> [[X:%.*]])
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; CHECK-NEXT: ret <4 x double> [[TMP1]]
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;
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%f = call <4 x double> @llvm.fabs.v4f64(<4 x double> %x)
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%div = fdiv nnan ninf <4 x double> %x, %f
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ret <4 x double> %div
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}
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define <4 x double> @fabs_copysign_vec_commuted(<4 x double> %x) {
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; CHECK-LABEL: @fabs_copysign_vec_commuted(
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; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf <4 x double> @llvm.copysign.v4f64(<4 x double> <double 1.000000e+00, double 1.000000e+00, double 1.000000e+00, double 1.000000e+00>, <4 x double> [[X:%.*]])
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; CHECK-NEXT: ret <4 x double> [[TMP1]]
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;
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%f = call <4 x double> @llvm.fabs.v4f64(<4 x double> %x)
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%div = fdiv nnan ninf <4 x double> %f, %x
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ret <4 x double> %div
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}
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define float @fabs_copysignf(float %x) {
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; CHECK-LABEL: @fabs_copysignf(
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; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf float @llvm.copysign.f32(float 1.000000e+00, float [[X:%.*]])
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; CHECK-NEXT: ret float [[TMP1]]
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;
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%f = tail call float @llvm.fabs.f32(float %x)
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%div = fdiv nnan ninf float %x, %f
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ret float %div
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}
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define double @fabs_copysign_use(double %x) {
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; CHECK-LABEL: @fabs_copysign_use(
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; CHECK-NEXT: [[F:%.*]] = tail call double @llvm.fabs.f64(double [[X:%.*]])
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; CHECK-NEXT: call void @use(double [[F]])
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; CHECK-NEXT: [[TMP1:%.*]] = call nnan ninf double @llvm.copysign.f64(double 1.000000e+00, double [[X]])
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; CHECK-NEXT: ret double [[TMP1]]
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;
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%f = tail call double @llvm.fabs.f64(double %x)
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call void @use(double %f)
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%div = fdiv nnan ninf double %x, %f
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ret double %div
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}
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; Negative tests
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define double @fabs_copysign_mismatch(double %x, double %y) {
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; CHECK-LABEL: @fabs_copysign_mismatch(
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; CHECK-NEXT: [[F:%.*]] = tail call double @llvm.fabs.f64(double [[Y:%.*]])
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; CHECK-NEXT: [[DIV:%.*]] = fdiv double [[X:%.*]], [[F]]
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; CHECK-NEXT: ret double [[DIV]]
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;
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%f = tail call double @llvm.fabs.f64(double %y)
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%div = fdiv double %x, %f
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ret double %div
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}
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define double @fabs_copysign_commuted_mismatch(double %x, double %y) {
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; CHECK-LABEL: @fabs_copysign_commuted_mismatch(
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; CHECK-NEXT: [[F:%.*]] = tail call double @llvm.fabs.f64(double [[Y:%.*]])
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; CHECK-NEXT: [[DIV:%.*]] = fdiv double [[F]], [[X:%.*]]
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; CHECK-NEXT: ret double [[DIV]]
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;
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%f = tail call double @llvm.fabs.f64(double %y)
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%div = fdiv double %f, %x
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ret double %div
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}
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define double @fabs_copysign_no_nnan(double %x) {
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; CHECK-LABEL: @fabs_copysign_no_nnan(
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; CHECK-NEXT: [[F:%.*]] = tail call double @llvm.fabs.f64(double [[X:%.*]])
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; CHECK-NEXT: [[DIV:%.*]] = fdiv ninf double [[X]], [[F]]
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; CHECK-NEXT: ret double [[DIV]]
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;
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%f = tail call double @llvm.fabs.f64(double %x)
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%div = fdiv ninf double %x, %f
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ret double %div
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}
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define double @fabs_copysign_no_ninf(double %x) {
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; CHECK-LABEL: @fabs_copysign_no_ninf(
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; CHECK-NEXT: [[F:%.*]] = tail call double @llvm.fabs.f64(double [[X:%.*]])
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; CHECK-NEXT: [[DIV:%.*]] = fdiv nnan double [[X]], [[F]]
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; CHECK-NEXT: ret double [[DIV]]
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;
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%f = tail call double @llvm.fabs.f64(double %x)
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%div = fdiv nnan double %x, %f
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ret double %div
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}
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