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| author | Sjoerd Meijer <sjoerd.meijer@arm.com> | 2018-03-07 09:10:44 +0000 |
|---|---|---|
| committer | Sjoerd Meijer <sjoerd.meijer@arm.com> | 2018-03-07 09:10:44 +0000 |
| commit | af30f06d5c56b556f8b1b055ffec9f40604733d3 (patch) | |
| tree | 7558688dc20c8657e7facdc28cb3c22eb6f95b3c /llvm/test | |
| parent | 91c853a79d68761c610b7ac2f183f0a401b48df3 (diff) | |
| download | bcm5719-llvm-af30f06d5c56b556f8b1b055ffec9f40604733d3.tar.gz bcm5719-llvm-af30f06d5c56b556f8b1b055ffec9f40604733d3.zip | |
[ARM] Fix for PR36577
Don't PerformSHLSimplify if the given node is used by a node that also uses a
constant because we may get stuck in an infinite combine loop.
bugzilla: https://bugs.llvm.org/show_bug.cgi?id=36577
Patch by Sam Parker.
Differential Revision: https://reviews.llvm.org/D44097
llvm-svn: 326882
Diffstat (limited to 'llvm/test')
| -rw-r--r-- | llvm/test/CodeGen/ARM/pr36577.ll | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/pr36577.ll b/llvm/test/CodeGen/ARM/pr36577.ll new file mode 100644 index 00000000000..2309ce21292 --- /dev/null +++ b/llvm/test/CodeGen/ARM/pr36577.ll @@ -0,0 +1,28 @@ +; RUN: llc -mtriple armv6t2 %s -o - | FileCheck %s +; RUN: llc -mtriple thumbv6t2 %s -o - | FileCheck %s --check-prefix=CHECK-T2 +; RUN: llc -mtriple armv7 %s -o - | FileCheck %s +; RUN: llc -mtriple thumbv7 %s -o - | FileCheck %s --check-prefix=CHECK-T2 +; RUN: llc -mtriple thumbv7m %s -o - | FileCheck %s --check-prefix=CHECK-T2 +; RUN: llc -mtriple thumbv8m.main %s -o - | FileCheck %s --check-prefix=CHECK-T2 + +@a = common dso_local local_unnamed_addr global i16 0, align 2 + +; CHECK-LABEL: pr36577 +; CHECK: ldrh r0, [r0] +; CHECK: bic r0, r1, r0, lsr #5 +; CHECK: mvn r1, #7 +; CHECK: orr r0, r0, r1 +; CHECK-T2: ldrh r0, [r0] +; CHECK-T2: bic.w r0, r1, r0, lsr #5 +; CHECK-T2: orn r0, r0, #7 +define dso_local arm_aapcscc i32** @pr36577() { +entry: + %0 = load i16, i16* @a, align 2 + %1 = lshr i16 %0, 7 + %2 = and i16 %1, 1 + %3 = zext i16 %2 to i32 + %4 = xor i32 %3, -1 + %add.ptr = getelementptr inbounds i32*, i32** null, i32 %4 + ret i32** %add.ptr +} + |
