[SystemZ] Fix LLVM crash on unoptimized code
Compiling the following function with -O0 would crash, since LLVM would
hit an assertion in getTestUnderMaskCond:
int test(unsigned long x)
{
return x >= 0 && x <= 15;
}
Fixed by detecting the case in the caller of getTestUnderMaskCond.
llvm-svn: 233541
diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-50.ll b/llvm/test/CodeGen/SystemZ/int-cmp-50.ll
new file mode 100644
index 0000000..287ac2c
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-50.ll
@@ -0,0 +1,30 @@
+; Verify that we do not crash on always-true conditions
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 -O0
+;
+; This test was compiled using clang -O0 from the following source code:
+;
+; int test(unsigned long x)
+; {
+; return x >= 0 && x <= 15;
+; }
+
+define signext i32 @test(i64 %x) {
+entry:
+ %x.addr = alloca i64, align 8
+ store i64 %x, i64* %x.addr, align 8
+ %0 = load i64, i64* %x.addr, align 8
+ %cmp = icmp uge i64 %0, 0
+ br i1 %cmp, label %land.rhs, label %land.end
+
+land.rhs: ; preds = %entry
+ %1 = load i64, i64* %x.addr, align 8
+ %cmp1 = icmp ule i64 %1, 15
+ br label %land.end
+
+land.end: ; preds = %land.rhs, %entry
+ %2 = phi i1 [ false, %entry ], [ %cmp1, %land.rhs ]
+ %land.ext = zext i1 %2 to i32
+ ret i32 %land.ext
+}
+