1 files changed, 24 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fast-isel-constant.ll b/test/CodeGen/X86/fast-isel-constant.ll
new file mode 100644
index 0000000..6f9240a
--- /dev/null
+++ b/test/CodeGen/X86/fast-isel-constant.ll
@@ -0,0 +1,24 @@
+; RUN: llc < %s -march=x86-64 -O0 | FileCheck %s
+; Make sure fast-isel doesn't reset the materialised constant map
+; across an intrinsic call.
+
+; CHECK: movl	$100000
+; CHECK-NOT: movl	$100000
+define i1 @test1(i32 %v1, i32 %v2, i32* %X) nounwind {
+entry:
+  %a = shl i32 100000, %v1
+  %t = call {i32, i1} @llvm.sadd.with.overflow.i32(i32 %a, i32 %v2)
+  %ext = extractvalue {i32, i1} %t, 0
+  %sum = shl i32 100000, %ext
+  %obit = extractvalue {i32, i1} %t, 1
+  br i1 %obit, label %overflow, label %normal
+
+normal:
+  store i32 %sum, i32* %X
+  br label %overflow
+
+overflow:
+  ret i1 false
+}
+
+declare {i32, i1} @llvm.sadd.with.overflow.i32(i32, i32)