If ADD, SUB, or MUL have an overflow bit that's used, don't do transformation on
them. The DAG combiner expects that nodes that are transformed have one value
result.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60857 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/add-with-overflow.ll b/test/CodeGen/X86/add-with-overflow.ll
index baf5771..4b9aa98 100644
--- a/test/CodeGen/X86/add-with-overflow.ll
+++ b/test/CodeGen/X86/add-with-overflow.ll
@@ -1,7 +1,7 @@
-; RUN: llvm-as < %s | llc -march=x86 | grep {jo} | count 1
-; RUN: llvm-as < %s | llc -march=x86 | grep {jc} | count 1
-; RUN: llvm-as < %s | llc -march=x86 -fast | grep {jo} | count 1
-; RUN: llvm-as < %s | llc -march=x86 -fast | grep {jc} | count 1
+; RUN: llvm-as < %s | llc -march=x86 | grep {jo} | count 2
+; RUN: llvm-as < %s | llc -march=x86 | grep {jc} | count 2
+; RUN: llvm-as < %s | llc -march=x86 -fast | grep {jo} | count 2
+; RUN: llvm-as < %s | llc -march=x86 -fast | grep {jc} | count 2
@ok = internal constant [4 x i8] c"%d\0A\00"
@no = internal constant [4 x i8] c"no\0A\00"
@@ -38,6 +38,38 @@
ret i1 false
}
+define i1 @func3() nounwind {
+entry:
+ %t = call {i32, i1} @llvm.sadd.with.overflow.i32(i32 0, i32 0)
+ %sum = extractvalue {i32, i1} %t, 0
+ %obit = extractvalue {i32, i1} %t, 1
+ br i1 %obit, label %carry, label %normal
+
+normal:
+ %t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum ) nounwind
+ ret i1 true
+
+carry:
+ %t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
+ ret i1 false
+}
+
+define i1 @func4() nounwind {
+entry:
+ %t = call {i32, i1} @llvm.uadd.with.overflow.i32(i32 0, i32 0)
+ %sum = extractvalue {i32, i1} %t, 0
+ %obit = extractvalue {i32, i1} %t, 1
+ br i1 %obit, label %carry, label %normal
+
+normal:
+ %t1 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @ok, i32 0, i32 0), i32 %sum ) nounwind
+ ret i1 true
+
+carry:
+ %t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
+ ret i1 false
+}
+
declare i32 @printf(i8*, ...) nounwind
declare {i32, i1} @llvm.sadd.with.overflow.i32(i32, i32)
declare {i32, i1} @llvm.uadd.with.overflow.i32(i32, i32)