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
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 0000000..4e3146d
--- /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)