| commit | 95a5e0507e07fa3ef7c61aade9eb0efd1d716a25 | [log] [tgz] |
|---|---|---|
| author | Chris Lattner <sabre@nondot.org> | Tue Apr 17 19:03:21 2007 +0000 |
| committer | Chris Lattner <sabre@nondot.org> | Tue Apr 17 19:03:21 2007 +0000 |
| tree | 5e0819e14bab28658a27d0ad6675ce695aaac06d | |
| parent | 84e8315aaaf558195c73f0c04e9a1b1bc4dbd293 [diff] |
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36212 91177308-0d34-0410-b5e6-96231b3b80d8