Add a testcase for my recent InstCombine fix, written by Nicholas.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45386 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/InstCombine/2007-12-28-IcmpSub2.ll b/test/Transforms/InstCombine/2007-12-28-IcmpSub2.ll
new file mode 100644 (file)
index 0000000..5e95993
--- /dev/null
+++ b/test/Transforms/InstCombine/2007-12-28-IcmpSub2.ll
@@ -0,0 +1,89 @@
+; RUN: llvm-as < %s | opt -mem2reg -instcombine | llvm-dis | grep "ret i32 1" | count 8
+
+define i32 @test1() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp ule i32 %sub, 0
+       %retval = select i1 %cmp, i32 0, i32 1
+       ret i32 %retval
+}
+
+define i32 @test2() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp ugt i32 %sub, 0
+       %retval = select i1 %cmp, i32 1, i32 0
+       ret i32 %retval
+}
+
+define i32 @test3() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp slt i32 %sub, 0
+       %retval = select i1 %cmp, i32 1, i32 0
+       ret i32 %retval
+}
+
+define i32 @test4() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp sle i32 %sub, 0
+       %retval = select i1 %cmp, i32 1, i32 0
+       ret i32 %retval
+}
+
+define i32 @test5() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp sge i32 %sub, 0
+       %retval = select i1 %cmp, i32 0, i32 1
+       ret i32 %retval
+}
+
+define i32 @test6() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp sgt i32 %sub, 0
+       %retval = select i1 %cmp, i32 0, i32 1
+       ret i32 %retval
+}
+
+define i32 @test7() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp eq i32 %sub, 0
+       %retval = select i1 %cmp, i32 0, i32 1
+       ret i32 %retval
+}
+
+define i32 @test8() {
+entry:
+       %z = alloca i32
+       store i32 0, i32* %z
+       %tmp = load i32* %z
+       %sub = sub i32 %tmp, 1
+       %cmp = icmp ne i32 %sub, 0
+       %retval = select i1 %cmp, i32 1, i32 0
+       ret i32 %retval
+}
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