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| author | Chris Lattner <sabre@nondot.org> | 2007-04-17 19:03:21 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-04-17 19:03:21 +0000 |
| commit | 9ad5915559a97b7adc6d74b3f64eff5922487c6c (patch) | |
| tree | 3c9c5a1251b82bacf79b4120c27f67936ebecd20 /llvm/lib/Analysis/ValueNumbering.cpp | |
| parent | 2a4054bddb06cfcc71ab276157d14360a3f86c7d (diff) | |
| download | bcm5719-llvm-9ad5915559a97b7adc6d74b3f64eff5922487c6c.tar.gz bcm5719-llvm-9ad5915559a97b7adc6d74b3f64eff5922487c6c.zip | |
SIGN_EXTEND_INREG does not demand its top bits. Give SimplifyDemandedBits
a chance to hack on it. This compiles:
int baz(long long a) { return (short)(((int)(a >>24)) >> 9); }
into:
_baz:
slwi r2, r3, 8
srwi r2, r2, 9
extsh r3, r2
blr
instead of:
_baz:
srwi r2, r4, 24
rlwimi r2, r3, 8, 0, 23
srwi r2, r2, 9
extsh r3, r2
blr
This implements CodeGen/PowerPC/sign_ext_inreg1.ll
llvm-svn: 36212
Diffstat (limited to 'llvm/lib/Analysis/ValueNumbering.cpp')
0 files changed, 0 insertions, 0 deletions
