From db8ec2d75a90ef7f0b8ab8b0e5bc78075c4dbe5c Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 9 Dec 2008 22:08:41 +0000
Subject: Add sub/mul overflow intrinsics. This currently doesn't have a
 target-independent way of determining overflow on multiplication. It's very
 tricky. Patch by Zoltan Varga!

llvm-svn: 60800
---
 llvm/test/CodeGen/X86/mul-with-overflow.ll | 41 ++++++++++++++++++++++++++++++
 llvm/test/CodeGen/X86/sub-with-overflow.ll | 41 ++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 llvm/test/CodeGen/X86/mul-with-overflow.ll
 create mode 100644 llvm/test/CodeGen/X86/sub-with-overflow.ll

(limited to 'llvm/test/CodeGen')

diff --git a/llvm/test/CodeGen/X86/mul-with-overflow.ll b/llvm/test/CodeGen/X86/mul-with-overflow.ll
new file mode 100644
index 00000000000..107d54714e2
--- /dev/null
+++ b/llvm/test/CodeGen/X86/mul-with-overflow.ll
@@ -0,0 +1,41 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep {jo} | count 1
+; RUN: llvm-as < %s | llc -march=x86 | grep {jc} | count 1
+
+@ok = internal constant [4 x i8] c"%d\0A\00"
+@no = internal constant [4 x i8] c"no\0A\00"
+
+define i1 @func1(i32 %v1, i32 %v2) nounwind {
+entry:
+  %t = call {i32, i1} @llvm.smul.with.overflow.i32(i32 %v1, i32 %v2)
+  %sum = extractvalue {i32, i1} %t, 0
+  %obit = extractvalue {i32, i1} %t, 1
+  br i1 %obit, label %overflow, 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
+
+overflow:
+  %t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
+  ret i1 false
+}
+
+define i1 @func2(i32 %v1, i32 %v2) nounwind {
+entry:
+  %t = call {i32, i1} @llvm.umul.with.overflow.i32(i32 %v1, i32 %v2)
+  %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.smul.with.overflow.i32(i32, i32)
+declare {i32, i1} @llvm.umul.with.overflow.i32(i32, i32)
diff --git a/llvm/test/CodeGen/X86/sub-with-overflow.ll b/llvm/test/CodeGen/X86/sub-with-overflow.ll
new file mode 100644
index 00000000000..f51fc210819
--- /dev/null
+++ b/llvm/test/CodeGen/X86/sub-with-overflow.ll
@@ -0,0 +1,41 @@
+; RUN: llvm-as < %s | llc -march=x86 | grep {jo} | count 1
+; RUN: llvm-as < %s | llc -march=x86 | grep {jc} | count 1
+
+@ok = internal constant [4 x i8] c"%d\0A\00"
+@no = internal constant [4 x i8] c"no\0A\00"
+
+define i1 @func1(i32 %v1, i32 %v2) nounwind {
+entry:
+  %t = call {i32, i1} @llvm.ssub.with.overflow.i32(i32 %v1, i32 %v2)
+  %sum = extractvalue {i32, i1} %t, 0
+  %obit = extractvalue {i32, i1} %t, 1
+  br i1 %obit, label %overflow, 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
+
+overflow:
+  %t2 = tail call i32 (i8*, ...)* @printf( i8* getelementptr ([4 x i8]* @no, i32 0, i32 0) ) nounwind
+  ret i1 false
+}
+
+define i1 @func2(i32 %v1, i32 %v2) nounwind {
+entry:
+  %t = call {i32, i1} @llvm.usub.with.overflow.i32(i32 %v1, i32 %v2)
+  %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.ssub.with.overflow.i32(i32, i32)
+declare {i32, i1} @llvm.usub.with.overflow.i32(i32, i32)
-- 
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