diff options
| author | Nate Begeman <natebegeman@mac.com> | 2006-02-02 07:27:56 +0000 |
|---|---|---|
| committer | Nate Begeman <natebegeman@mac.com> | 2006-02-02 07:27:56 +0000 |
| commit | 93c740bbbb47280cee38872eb58bfad70f93be66 (patch) | |
| tree | c19a8cf76c2c2f0e295fcffd8c3879191678bb80 | |
| parent | 3603cd62aed5cc54ec626848d0195eed2958312a (diff) | |
Update the README
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25902 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/README.txt | 22 |
1 files changed, 3 insertions, 19 deletions
diff --git a/lib/Target/PowerPC/README.txt b/lib/Target/PowerPC/README.txt index eccdae71e0..d77d20d85a 100644 --- a/lib/Target/PowerPC/README.txt +++ b/lib/Target/PowerPC/README.txt @@ -94,19 +94,6 @@ more than one use. Itanium will want this too. ===-------------------------------------------------------------------------=== -int foo(int a, int b) { return a == b ? 16 : 0; } -_foo: - cmpw cr7, r3, r4 - mfcr r2 - rlwinm r2, r2, 31, 31, 31 - slwi r3, r2, 4 - blr - -If we exposed the srl & mask ops after the MFCR that we are doing to select -the correct CR bit, then we could fold the slwi into the rlwinm before it. - -===-------------------------------------------------------------------------=== - #define ARRAY_LENGTH 16 union bitfield { @@ -451,16 +438,13 @@ _test: cntlzw r2, r2 cntlzw r3, r3 srwi r2, r2, 5 - srwi r3, r3, 5 - li r4, 0 + srwi r4, r3, 5 + li r3, 0 cmpwi cr0, r2, 0 bne cr0, LBB1_2 ; LBB1_1: - or r4, r3, r3 + or r3, r4, r4 LBB1_2: - cmplw cr7, r4, r3 - mfcr r2, 1 - rlwinm r3, r2, 29, 31, 31 blr noticed in 2005-05-11-Popcount-ffs-fls.c. |