[SCCP] Can't go from overdefined to constant

[oota-llvm.git] / test / Transforms / IPConstantProp / PR26044.ll

diff --git a/test/Transforms/IPConstantProp/PR26044.ll b/test/Transforms/IPConstantProp/PR26044.ll
new file mode 100644 (file)
index 0000000..9e8c61e
--- /dev/null
+++ b/test/Transforms/IPConstantProp/PR26044.ll
@@ -0,0 +1,31 @@
+; RUN: opt < %s -S -ipsccp | FileCheck %s
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @fn2() {
+entry:
+  br label %if.end
+
+for.cond1:                                        ; preds = %if.end, %for.end
+  br i1 undef, label %if.end, label %if.end
+
+if.end:                                           ; preds = %lbl, %for.cond1
+  %e.2 = phi i32* [ undef, %entry ], [ null, %for.cond1 ], [ null, %for.cond1 ]
+  %0 = load i32, i32* %e.2, align 4
+  %call = call i32 @fn1(i32 %0)
+  br label %for.cond1
+}
+
+define internal i32 @fn1(i32 %p1) {
+entry:
+  %tobool = icmp ne i32 %p1, 0
+  %cond = select i1 %tobool, i32 %p1, i32 %p1
+  ret i32 %cond
+}
+
+; CHECK-LABEL: define void @fn2(
+; CHECK: call i32 @fn1(i32 undef)
+
+; CHECK-LABEL: define internal i32 @fn1(
+; CHECK:%[[COND:.*]] = select i1 undef, i32 undef, i32 undef
+; CHECK: ret i32 %[[COND]]