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My previous commit had an incomplete message, it should have been:

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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
This commit is contained in:
Chris Lattner 2008-01-16 05:56:59 +00:00
parent 142fb3fee8
commit 7ff79c2d9d
2 changed files with 13 additions and 1 deletions
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12
test/CodeGen/X86/fp-stack-retcopy.ll Normal file
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@ -0,0 +1,12 @@
; 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
}