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| author | Evan Cheng <evan.cheng@apple.com> | 2009-03-01 02:03:43 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-03-01 02:03:43 +0000 |
| commit | 870b80722f7ce3232dd45e95cff663d177e0acc0 (patch) | |
| tree | a0a428b5e0b242fc7933c68473a838892e767434 /test/CodeGen/X86/twoaddr-coalesce-2.ll | |
| parent | 890484984bd0d3a5f9d80808b0d251424c7ddf7a (diff) | |
Minor optimization:
Look for situations like this:
%reg1024<def> = MOV r1
%reg1025<def> = MOV r0
%reg1026<def> = ADD %reg1024, %reg1025
r0 = MOV %reg1026
Commute the ADD to hopefully eliminate an otherwise unavoidable copy.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65752 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/X86/twoaddr-coalesce-2.ll')
| -rw-r--r-- | test/CodeGen/X86/twoaddr-coalesce-2.ll | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/test/CodeGen/X86/twoaddr-coalesce-2.ll b/test/CodeGen/X86/twoaddr-coalesce-2.ll new file mode 100644 index 0000000000..9a011f7bac --- /dev/null +++ b/test/CodeGen/X86/twoaddr-coalesce-2.ll @@ -0,0 +1,15 @@ +; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -stats |& \ +; RUN: grep {twoaddrinstr} | grep {Number of instructions aggressively commuted} +; rdar://6480363 + +target triple = "i386-apple-darwin9.6" + +define <2 x double> @t(<2 x double> %A, <2 x double> %B, <2 x double> %C) nounwind readnone { +entry: + %tmp.i3 = bitcast <2 x double> %B to <2 x i64> ; <<2 x i64>> [#uses=1] + %tmp2.i = or <2 x i64> %tmp.i3, <i64 4607632778762754458, i64 4607632778762754458> ; <<2 x i64>> [#uses=1] + %tmp3.i = bitcast <2 x i64> %tmp2.i to <2 x double> ; <<2 x double>> [#uses=1] + %tmp.i2 = add <2 x double> %tmp3.i, %A ; <<2 x double>> [#uses=1] + %tmp.i = add <2 x double> %tmp.i2, %C ; <<2 x double>> [#uses=1] + ret <2 x double> %tmp.i +} |