diff options
| author | Tim Northover <tnorthover@apple.com> | 2014-07-07 09:06:35 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2014-07-07 09:06:35 +0000 |
| commit | 55beb64bd063196acda5dd51e7e63f2ceae48ee7 (patch) | |
| tree | bf843e8d0c020fb8cbf167c850432b2e133392b9 /llvm/test/Transforms | |
| parent | 03376dc2c525c725323993fe0a17fd5d7313a9e7 (diff) | |
| download | bcm5719-llvm-55beb64bd063196acda5dd51e7e63f2ceae48ee7.tar.gz bcm5719-llvm-55beb64bd063196acda5dd51e7e63f2ceae48ee7.zip | |
CodeGen: it turns out that NAND is not the same thing as BIC. At all.
We've been performing the wrong operation on ARM for "atomicrmw nand" for
years, since "a NAND b" is "~(a & b)" rather than ARM's very tempting "a & ~b".
This bled over into the generic expansion pass.
So I assume no-one has ever actually tried to do an atomic nand in the real
world. Oh well.
llvm-svn: 212443
Diffstat (limited to 'llvm/test/Transforms')
| -rw-r--r-- | llvm/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll b/llvm/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll index f2f5b925163..6a93016fc26 100644 --- a/llvm/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll +++ b/llvm/test/Transforms/AtomicExpandLoadLinked/ARM/atomic-expansion-v7.ll @@ -80,8 +80,8 @@ define i16 @test_atomic_nand_i16(i16* %ptr, i16 %nandend) { ; CHECK: [[LOOP]]: ; CHECK: [[OLDVAL32:%.*]] = call i32 @llvm.arm.ldrex.p0i16(i16* %ptr) ; CHECK: [[OLDVAL:%.*]] = trunc i32 [[OLDVAL32]] to i16 -; CHECK: [[NEWVAL_TMP:%.*]] = xor i16 %nandend, -1 -; CHECK: [[NEWVAL:%.*]] = and i16 [[OLDVAL]], [[NEWVAL_TMP]] +; CHECK: [[NEWVAL_TMP:%.*]] = and i16 [[OLDVAL]], %nandend +; CHECK: [[NEWVAL:%.*]] = xor i16 [[NEWVAL_TMP]], -1 ; CHECK: [[NEWVAL32:%.*]] = zext i16 [[NEWVAL]] to i32 ; CHECK: [[TRYAGAIN:%.*]] = call i32 @llvm.arm.strex.p0i16(i32 [[NEWVAL32]], i16* %ptr) ; CHECK: [[TST:%.*]] = icmp ne i32 [[TRYAGAIN]], 0 |
