[ConstProp] add test for miscompile from bitcast transform; NFC

This problem goes with the fix in D51215.

llvm-svn: 353883

1 files changed, 16 insertions, 2 deletions

diff --git a/llvm/test/Transforms/ConstProp/bitcast.ll b/llvm/test/Transforms/ConstProp/bitcast.ll
index 5e1581d801c..353062ee3fe 100644
--- a/llvm/test/Transforms/ConstProp/bitcast.ll
+++ b/llvm/test/Transforms/ConstProp/bitcast.ll
@@ -1,10 +1,24 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -constprop -S | FileCheck %s
 ; PR2165
 
 define <1 x i64> @test1() {
+; CHECK-LABEL: @test1(
+; CHECK-NEXT:    ret <1 x i64> <i64 63>
+;
   %A = bitcast i64 63 to <1 x i64>
   ret <1 x i64> %A
-; CHECK-LABEL: @test1(
-; CHECK: ret <1 x i64> <i64 63>
 }
 
+; FIXME: Don't try to propagate an FP source operand to an icmp.
+
+@a = external global i16, align 1
+@b = external global i16, align 1
+
+define i1 @bad_icmp_constexpr_bitcast() {
+; CHECK-LABEL: @bad_icmp_constexpr_bitcast(
+; CHECK-NEXT:    ret i1 icmp eq (float bitcast (i32 ptrtoint (i16* @a to i32) to float), float fadd (float bitcast (i32 ptrtoint (i16* @b to i32) to float), float 2.000000e+00))
+;
+  %cmp = icmp eq i32 ptrtoint (i16* @a to i32), bitcast (float fadd (float bitcast (i32 ptrtoint (i16* @b to i32) to float), float 2.0) to i32)
+  ret i1 %cmp
+}