llvm-6502/test/CodeGen/X86/copysign-zero.ll

; RUN: llvm-as < %s | llc | not grep orpd
; RUN: llvm-as < %s | llc | grep andpd | count 1

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-apple-darwin8"

define double @test(double %X) nounwind  {
entry:
	%tmp2 = tail call double @copysign( double 0.000000e+00, double %X ) nounwind readnone 		; <double> [#uses=1]
	ret double %tmp2
}

declare double @copysign(double, double) nounwind readnone
Add target-specific dag combines for FAND(x,0) and FOR(x,0). This allows us to compile: double test(double X) { return copysign(0.0, X); } into: _test: andpd LCPI1_0(%rip), %xmm0 ret instead of: _test: pxor %xmm1, %xmm1 andpd LCPI1_0(%rip), %xmm1 movapd %xmm0, %xmm2 andpd LCPI1_1(%rip), %xmm2 movapd %xmm1, %xmm0 orpd %xmm2, %xmm0 ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46344 91177308-0d34-0410-b5e6-96231b3b80d8 2008-01-25 05:46:26 +00:00			`; RUN: llvm-as < %s \| llc \| not grep orpd`
			`; RUN: llvm-as < %s \| llc \| grep andpd \| count 1`

			`target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"`
			`target triple = "x86_64-apple-darwin8"`

			`define double @test(double %X) nounwind {`
			`entry:`
			`%tmp2 = tail call double @copysign( double 0.000000e+00, double %X ) nounwind readnone ; <double> [#uses=1]`
			`ret double %tmp2`
			`}`

			`declare double @copysign(double, double) nounwind readnone`