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| author | Chris Lattner <sabre@nondot.org> | 2009-03-07 23:32:02 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-03-07 23:32:02 +0000 |
| commit | e1d0fa1c2288e7141ee86c0c82093d75500ea144 (patch) | |
| tree | 93ae22bf054a1b089894325d6d6118d32a10af44 /lib/CompilerDriver/CompilationGraph.cpp | |
| parent | aca7e1c1fec05b4d818ac5867fce8e269b59680b (diff) | |
| download | external_llvm-e1d0fa1c2288e7141ee86c0c82093d75500ea144.zip external_llvm-e1d0fa1c2288e7141ee86c0c82093d75500ea144.tar.gz external_llvm-e1d0fa1c2288e7141ee86c0c82093d75500ea144.tar.bz2 | |
fix a serious pessimization that Tron on IRC pointed out where we would
"boolify" pointers, generating really awful code because getting the pointer
value requires a load itself. Before:
_foo:
movb $1, _X.b
ret
_get:
xorl %ecx, %ecx
movb _X.b, %al
testb %al, %al
movl $_Y, %eax
cmove %ecx, %eax
ret
With the xform disabled:
_foo:
movl $_Y, _X
ret
_get:
movl _X, %eax
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66351 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CompilerDriver/CompilationGraph.cpp')
0 files changed, 0 insertions, 0 deletions