diff options
| author | Bob Wilson <bob.wilson@apple.com> | 2011-04-19 18:11:49 +0000 |
|---|---|---|
| committer | Bob Wilson <bob.wilson@apple.com> | 2011-04-19 18:11:49 +0000 |
| commit | 5dde893c2bac9e1569c38429f756c1d723e8edf2 (patch) | |
| tree | c50cc65135cde589cb7ccb40f829b18e1c9b3454 /test | |
| parent | f6a4d3c2f3e1029af252a0f6999edfa3c2f326ee (diff) | |
| download | llvm-5dde893c2bac9e1569c38429f756c1d723e8edf2.tar.gz llvm-5dde893c2bac9e1569c38429f756c1d723e8edf2.tar.bz2 llvm-5dde893c2bac9e1569c38429f756c1d723e8edf2.tar.xz | |
Avoid some 's' 16-bit instruction which partially update CPSR
(and add false dependency) when it isn't dependent on last CPSR defining
instruction. rdar://8928208
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129773 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/CodeGen/ARM/avoid-cpsr-rmw.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/avoid-cpsr-rmw.ll b/test/CodeGen/ARM/avoid-cpsr-rmw.ll new file mode 100644 index 0000000000..d0c4f3ae9d --- /dev/null +++ b/test/CodeGen/ARM/avoid-cpsr-rmw.ll @@ -0,0 +1,16 @@ +; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a9 | FileCheck %s +; Avoid some 's' 16-bit instruction which partially update CPSR (and add false +; dependency) when it isn't dependent on last CPSR defining instruction. +; rdar://8928208 + +define i32 @t(i32 %a, i32 %b, i32 %c, i32 %d) nounwind readnone { + entry: +; CHECK: t: +; CHECK: muls r2, r3, r2 +; CHECK-NEXT: mul r0, r0, r1 +; CHECK-NEXT: muls r0, r2, r0 + %0 = mul nsw i32 %a, %b + %1 = mul nsw i32 %c, %d + %2 = mul nsw i32 %0, %1 + ret i32 %2 +} |