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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 | e31328319912be4aee3fd575e82bf5b370c08bc5 (patch) | |
| tree | 47b011273a96c3d6c2d9cd362eee03c8469ef944 /llvm/lib/CodeGen/PseudoSourceValue.cpp | |
| parent | f653c2e18eed1c9d92d14387fdb890032c6fc7c2 (diff) | |
| download | bcm5719-llvm-e31328319912be4aee3fd575e82bf5b370c08bc5.tar.gz bcm5719-llvm-e31328319912be4aee3fd575e82bf5b370c08bc5.zip | |
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
llvm-svn: 66351
Diffstat (limited to 'llvm/lib/CodeGen/PseudoSourceValue.cpp')
0 files changed, 0 insertions, 0 deletions
