llvm-6502/test/CodeGen/X86/fp-stack-retcopy.ll at aeaf245db33fa8bccdd14bb8899ee0585a75a7b1 - llvm-6502 - Applefritter: Git

6502/llvm-6502

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Chris Lattner 7ff79c2d9d 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

13 lines

352 B

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 ; 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
 }