From 7ff79c2d9d5e0c014ca8283cd38f5fbf3dd67790 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 16 Jan 2008 05:56:59 +0000 Subject: 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 --- test/CodeGen/X86/fp-stack-retcopy.ll | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 test/CodeGen/X86/fp-stack-retcopy.ll (limited to 'test/CodeGen/X86/fp-stack-retcopy.ll') diff --git a/test/CodeGen/X86/fp-stack-retcopy.ll b/test/CodeGen/X86/fp-stack-retcopy.ll new file mode 100644 index 0000000..997f8df --- /dev/null +++ b/test/CodeGen/X86/fp-stack-retcopy.ll @@ -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 ; [#uses=1] + ret double %tmp5 +} + -- cgit v1.1