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0bb74a59ff
Summary: This patch enables folding following expressions under -ffast-math flag: exp(log(x)) -> x, exp2(log2(x)) -> x, log(exp(x)) -> x, log2(exp2(x)) -> x Reviewers: spatel, hfinkel, davide Reviewed By: spatel, hfinkel, davide Subscribers: scanon, llvm-commits Differential Revision: https://reviews.llvm.org/D41381 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@321710 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.3 KiB
LLVM
72 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare double @llvm.log.f64(double)
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declare double @llvm.exp.f64(double)
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define double @log_exp(double %a) {
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; CHECK-LABEL: @log_exp(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call double @llvm.exp.f64(double %a)
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%2 = call double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_exp_fast(double %a) {
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; CHECK-LABEL: @log_exp_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.exp.f64(double %a)
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%2 = call fast double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_fast_exp_strict(double %a) {
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; CHECK-LABEL: @log_fast_exp_strict(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call double @llvm.exp.f64(double %a)
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%2 = call fast double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_strict_exp_fast(double %a) {
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; CHECK-LABEL: @log_strict_exp_fast(
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; CHECK-NEXT: [[TMP1:%.*]] = call fast double @llvm.exp.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log.f64(double [[TMP1]])
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; CHECK-NEXT: ret double [[TMP2]]
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;
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%1 = call fast double @llvm.exp.f64(double %a)
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%2 = call double @llvm.log.f64(double %1)
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ret double %2
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}
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define double @log_exp_log_exp(double %a) {
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; CHECK-LABEL: @log_exp_log_exp(
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; CHECK-NEXT: [[TMP1:%.*]] = call double @llvm.exp.f64(double [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = call double @llvm.log.f64(double [[TMP1]])
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; CHECK-NEXT: [[TMP3:%.*]] = call double @llvm.exp.f64(double [[TMP2]])
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; CHECK-NEXT: [[TMP4:%.*]] = call double @llvm.log.f64(double [[TMP3]])
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; CHECK-NEXT: ret double [[TMP4]]
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;
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%1 = call double @llvm.exp.f64(double %a)
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%2 = call double @llvm.log.f64(double %1)
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%3 = call double @llvm.exp.f64(double %2)
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%4 = call double @llvm.log.f64(double %3)
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ret double %4
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}
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define double @log_exp_log_exp_fast(double %a) {
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; CHECK-LABEL: @log_exp_log_exp_fast(
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; CHECK-NEXT: ret double [[A:%.*]]
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;
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%1 = call fast double @llvm.exp.f64(double %a)
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%2 = call fast double @llvm.log.f64(double %1)
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%3 = call fast double @llvm.exp.f64(double %2)
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%4 = call fast double @llvm.log.f64(double %3)
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ret double %4
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}
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