llvm-mirror/test/CodeGen/X86/powi.ll

; RUN: llc %s -march=x86 -mcpu=yonah -o - | grep mulsd | count 6
; Ideally this would compile to 5 multiplies.

define double @_Z3f10d(double %a) nounwind readonly ssp noredzone {
entry:
  %0 = tail call double @llvm.powi.f64(double %a, i32 15) nounwind ; <double> [#uses=1]
  ret double %0
}

declare double @llvm.powi.f64(double, i32) nounwind readonly
Teach codegen to lower llvm.powi to an efficient (but not optimal) multiply sequence when the power is a constant integer. Before, our codegen for std::pow(.., int) always turned into a libcall, which was really inefficient. This should also make many gfortran programs happier I'd imagine. llvm-svn: 92388 2010-01-01 04:32:16 +01:00			`; RUN: llc %s -march=x86 -mcpu=yonah -o - \| grep mulsd \| count 6`
			`; Ideally this would compile to 5 multiplies.`

			`define double @_Z3f10d(double %a) nounwind readonly ssp noredzone {`
			`entry:`
			`%0 = tail call double @llvm.powi.f64(double %a, i32 15) nounwind ; <double> [#uses=1]`
			`ret double %0`
			`}`

			`declare double @llvm.powi.f64(double, i32) nounwind readonly`