llvm-mirror/fp-stack-retcopy.ll at 482ea64f7b7df8d780b0314114a5657e76d3ac9c - llvm-mirror - Git.je (Gitea)

RPCS3/llvm-mirror

mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-22 12:33:33 +02:00

Chris Lattner 41e1fd13b2 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.

llvm-svn: 46054

2008-01-16 05:56:59 +00:00

13 lines

352 B

LLVM

Raw Blame History

 ; 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
 }