diff options
| author | Sanjay Patel <spatel@rotateright.com> | 2016-10-19 16:58:59 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2016-10-19 16:58:59 +0000 |
| commit | 85745f9561b7f54e75d40b8e35245c4b9e6ecd65 (patch) | |
| tree | 17f325342764c9f3ce710f189b2c09076b4299dd /test/CodeGen/SystemZ/risbg-01.ll | |
| parent | 8b3f7e86b154f57cfd2209d9b0c66da36070df2e (diff) | |
[DAG] optimize negation of bool
Use mask and negate for legalization of i1 source type with SIGN_EXTEND_INREG.
With the mask, this should be no worse than 2 shifts. The mask can be eliminated
in some cases, so that should be better than 2 shifts.
This change exposed some missing folds related to negation:
https://reviews.llvm.org/rL284239
https://reviews.llvm.org/rL284395
There may be others, so please let me know if you see any regressions.
Differential Revision: https://reviews.llvm.org/D25485
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284611 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/SystemZ/risbg-01.ll')
| -rw-r--r-- | test/CodeGen/SystemZ/risbg-01.ll | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/test/CodeGen/SystemZ/risbg-01.ll b/test/CodeGen/SystemZ/risbg-01.ll index 1c4315343de..6a146fab82c 100644 --- a/test/CodeGen/SystemZ/risbg-01.ll +++ b/test/CodeGen/SystemZ/risbg-01.ll @@ -472,9 +472,9 @@ define i64 @f41(i32 %a) { ; when testing whether the shifted-in bits of the shift right were significant. define i64 @f42(i1 %x) { ; CHECK-LABEL: f42: -; CHECK: sll %r2, 31 -; CHECK: sra %r2, 31 -; CHECK: llgcr %r2, %r2 +; CHECK: nilf %r2, 1 +; CHECK: lcr %r0, %r2 +; CHECK: llgcr %r2, %r0 ; CHECK: br %r14 %ext = sext i1 %x to i8 %ext2 = zext i8 %ext to i64 |