Add some generic expansion logic for SMULO and UMULO. Fixes UMULO
support for x86, and UMULO/SMULO for many architectures, including PPC
(PR4201), ARM, and Cell. The resulting expansion isn't perfect, but it's
not bad.
llvm-svn: 73477
diff --git a/llvm/test/CodeGen/X86/umul-with-overflow.ll b/llvm/test/CodeGen/X86/umul-with-overflow.ll
new file mode 100644
index 0000000..9e69154
--- /dev/null
+++ b/llvm/test/CodeGen/X86/umul-with-overflow.ll
@@ -0,0 +1,8 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep "\\\\\\\<mul"
+
+declare {i32, i1} @llvm.umul.with.overflow.i32(i32 %a, i32 %b)
+define i1 @a(i32 %x) zeroext nounwind {
+ %res = call {i32, i1} @llvm.umul.with.overflow.i32(i32 %x, i32 3)
+ %obil = extractvalue {i32, i1} %res, 1
+ ret i1 %obil
+}