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authorChris Lattner <sabre@nondot.org>2008-01-16 05:56:59 +0000
committerChris Lattner <sabre@nondot.org>2008-01-16 05:56:59 +0000
commit7ff79c2d9d5e0c014ca8283cd38f5fbf3dd67790 (patch)
tree9fa33b732507848b56458b5d43d0a75f3ed48fcf /test/CodeGen
parent142fb3fee8ebdcf5a501f6fc7d4dfe909e9c478e (diff)
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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
Diffstat (limited to 'test/CodeGen')
-rw-r--r--test/CodeGen/X86/fp-stack-retcopy.ll12
1 files changed, 12 insertions, 0 deletions
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 ; <double> [#uses=1]
+ ret double %tmp5
+}
+