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| author | Tim Northover <tnorthover@apple.com> | 2017-06-20 15:01:38 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2017-06-20 15:01:38 +0000 |
| commit | 208ddc5bdc554ed7c90d4515a04bb8f720b82213 (patch) | |
| tree | 9f082aa9bd97f94712a7b0b9d14ecd02b527184c /llvm/test/CodeGen/ARM/v6m-umul-with-overflow.ll | |
| parent | 2e4159801d8588b50b126af4e3233e03f6725f2e (diff) | |
| download | bcm5719-llvm-208ddc5bdc554ed7c90d4515a04bb8f720b82213.tar.gz bcm5719-llvm-208ddc5bdc554ed7c90d4515a04bb8f720b82213.zip | |
DAG: correctly legalize UMULO.
We were incorrectly sign extending into the high word (as you would for
SMULO) when legalizing UMULO in terms of a wider full multiplication.
Patch by James Duley.
llvm-svn: 305800
Diffstat (limited to 'llvm/test/CodeGen/ARM/v6m-umul-with-overflow.ll')
| -rw-r--r-- | llvm/test/CodeGen/ARM/v6m-umul-with-overflow.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/v6m-umul-with-overflow.ll b/llvm/test/CodeGen/ARM/v6m-umul-with-overflow.ll new file mode 100644 index 00000000000..4e3146d7110 --- /dev/null +++ b/llvm/test/CodeGen/ARM/v6m-umul-with-overflow.ll @@ -0,0 +1,16 @@ +; RUN: llc < %s -mtriple=thumbv6m-none-eabi | FileCheck %s + +define i1 @unsigned_multiplication_did_overflow(i32, i32) { +; CHECK-LABEL: unsigned_multiplication_did_overflow: +entry-block: + %2 = tail call { i32, i1 } @llvm.umul.with.overflow.i32(i32 %0, i32 %1) + %3 = extractvalue { i32, i1 } %2, 1 + ret i1 %3 + +; CHECK: mov{{s?}} r2, r1 +; CHECK: mov{{s?}} r1, #0 +; CHECK: mov{{s?}} r3, {{#0|r1}} +; CHECK: bl __aeabi_lmul +} + +declare { i32, i1 } @llvm.umul.with.overflow.i32(i32, i32) |
