Add support for sadd.with.overflow and uadd.with.overflow intrinsics to the CBackend by emitting definitions for each intrinsic that occurs in the module.

llvm-svn: 133522

1 files changed, 35 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/CBackend/2011-06-08-addWithOverflow.ll b/llvm/test/CodeGen/CBackend/2011-06-08-addWithOverflow.ll
new file mode 100644
index 00000000000..0ae480dcfdb
--- /dev/null
+++ b/llvm/test/CodeGen/CBackend/2011-06-08-addWithOverflow.ll
@@ -0,0 +1,35 @@
+; RUN: llc < %s -march=c
+; Check that uadd and sadd with overflow are handled by C Backend.
+
+%0 = type { i32, i1 }        ; type %0
+
+define i1 @func1(i32 zeroext %v1, i32 zeroext %v2) nounwind {
+entry:
+    %t = call %0 @llvm.uadd.with.overflow.i32(i32 %v1, i32 %v2)     ; <%0> [#uses=1]
+    %obit = extractvalue %0 %t, 1       ; <i1> [#uses=1]
+    br i1 %obit, label %carry, label %normal
+
+normal:     ; preds = %entry
+    ret i1 true
+
+carry:      ; preds = %entry
+    ret i1 false
+}
+
+define i1 @func2(i32 signext %v1, i32 signext %v2) nounwind {
+entry:
+    %t = call %0 @llvm.sadd.with.overflow.i32(i32 %v1, i32 %v2)     ; <%0> [#uses=1]
+    %obit = extractvalue %0 %t, 1       ; <i1> [#uses=1]
+    br i1 %obit, label %carry, label %normal
+
+normal:     ; preds = %entry
+    ret i1 true
+
+carry:      ; preds = %entry
+    ret i1 false
+}
+
+declare %0 @llvm.sadd.with.overflow.i32(i32, i32) nounwind
+
+declare %0 @llvm.uadd.with.overflow.i32(i32, i32) nounwind
+