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llvm-project/llvm/test/Transforms/InstCombine/pow-sqrt.ll

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[SimplifyLibCalls] New trick: pow(x, 0.5) -> sqrt(x) under -ffast-math. Differential Revision: http://reviews.llvm.org/D14466 llvm-svn: 253521
2015-11-19 07:21:32 +08:00
; RUN: opt < %s -instcombine -S | FileCheck %s
[LibCallSimplifier] use instruction-level fast-math-flags to transform pow(x, 0.5) calls Also, propagate the FMF to the newly created sqrt() call. llvm-svn: 257503
2016-01-13 03:06:35 +08:00
define double @pow_half(double %x) {
%pow = call fast double @llvm.pow.f64(double %x, double 5.000000e-01)
[SimplifyLibCalls] New trick: pow(x, 0.5) -> sqrt(x) under -ffast-math. Differential Revision: http://reviews.llvm.org/D14466 llvm-svn: 253521
2015-11-19 07:21:32 +08:00
ret double %pow
}
[LibCallSimplifier] use instruction-level fast-math-flags to transform pow(x, 0.5) calls Also, propagate the FMF to the newly created sqrt() call. llvm-svn: 257503
2016-01-13 03:06:35 +08:00
; CHECK-LABEL: define double @pow_half(
[SimplifyLibCalls] Restore the old behaviour, emit a libcall. Hal pointed out that the semantic of our intrinsic and the libc call are slightly different. Add a comment while I'm here to explain why we can't emit an intrinsic. Thanks Hal! llvm-svn: 278200
2016-08-10 14:33:32 +08:00
; CHECK-NEXT: %sqrt = call fast double @sqrt(double %x)
[LibCallSimplifier] use instruction-level fast-math-flags to transform pow(x, 0.5) calls Also, propagate the FMF to the newly created sqrt() call. llvm-svn: 257503
2016-01-13 03:06:35 +08:00
; CHECK-NEXT: ret double %sqrt
[SimplifyLibCalls] New trick: pow(x, 0.5) -> sqrt(x) under -ffast-math. Differential Revision: http://reviews.llvm.org/D14466 llvm-svn: 253521
2015-11-19 07:21:32 +08:00
declare double @llvm.pow.f64(double, double)
[LibCallSimplifier] use instruction-level fast-math-flags to transform pow(x, 0.5) calls Also, propagate the FMF to the newly created sqrt() call. llvm-svn: 257503
2016-01-13 03:06:35 +08:00