llvm/test/CodeGen/X86/fp-stack-retcopy.ll

; This should not copy the result of foo into an xmm register.
; RUN: llvm-as < %s | llc -march=x86 -mcpu=yonah -mtriple=i686-apple-darwin9 | not grep xmm
; rdar://5689903

declare double @foo()

define double @carg({ double, double }* byval  %z) nounwind  {
entry:
	%tmp5 = tail call double @foo() nounwind 		; <double> [#uses=1]
	ret double %tmp5
}
My previous commit had an incomplete message, it should have been: make the 'fp return in ST(0)' optimization smart enough to look through token factor nodes. THis allows us to compile testcases like CodeGen/X86/fp-stack-retcopy.ll into: _carg: subl $12, %esp call L_foo$stub fstpl (%esp) fldl (%esp) addl $12, %esp ret instead of: _carg: subl $28, %esp call L_foo$stub fstpl 16(%esp) movsd 16(%esp), %xmm0 movsd %xmm0, 8(%esp) fldl 8(%esp) addl $28, %esp ret Still not optimal, but much better and this is a trivial patch. Fixing the rest requires invasive surgery that is is not llvm 2.2 material. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46054 91177308-0d34-0410-b5e6-96231b3b80d8 2008-01-16 05:56:59 +00:00			`; This should not copy the result of foo into an xmm register.`
			`; RUN: llvm-as < %s \| llc -march=x86 -mcpu=yonah -mtriple=i686-apple-darwin9 \| not grep xmm`
			`; rdar://5689903`

			`declare double @foo()`

			`define double @carg({ double, double }* byval %z) nounwind {`
			`entry:`
			`%tmp5 = tail call double @foo() nounwind ; <double> [#uses=1]`
			`ret double %tmp5`
			`}`