[llvm-branch-commits] [llvm] d720e58 - Add test for PR47322 (NFC)

[Hans Wennborg via llvm-branch-commits]

Author: Nikita Popov
Date: 2020-09-15T10:21:08+02:00
New Revision: d720e5855dcf57b5b88ee6a4147ccd762115278a

URL: https://github.com/llvm/llvm-project/commit/d720e5855dcf57b5b88ee6a4147ccd762115278a
DIFF: https://github.com/llvm/llvm-project/commit/d720e5855dcf57b5b88ee6a4147ccd762115278a.diff

LOG: Add test for PR47322 (NFC)

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/select.ll

Removed: 
    


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diff  --git a/llvm/test/Transforms/InstCombine/select.ll b/llvm/test/Transforms/InstCombine/select.ll
index 185ff838b819..abdb36ab7bd4 100644
--- a/llvm/test/Transforms/InstCombine/select.ll
+++ b/llvm/test/Transforms/InstCombine/select.ll
@@ -2487,3 +2487,19 @@ define <2 x i32> @true_undef_vec(i1 %cond, <2 x i32> %x) {
   %s = select i1 %cond, <2 x i32> undef, <2 x i32> %x
   ret <2 x i32> %s
 }
+
+; FIXME: This is a miscompile!
+define i32 @pr47322_more_poisonous_replacement(i32 %arg) {
+; CHECK-LABEL: @pr47322_more_poisonous_replacement(
+; CHECK-NEXT:    [[TRAILING:%.*]] = call i32 @llvm.cttz.i32(i32 [[ARG:%.*]], i1 immarg true), [[RNG0:!range !.*]]
+; CHECK-NEXT:    [[SHIFTED:%.*]] = lshr i32 [[ARG]], [[TRAILING]]
+; CHECK-NEXT:    ret i32 [[SHIFTED]]
+;
+  %cmp = icmp eq i32 %arg, 0
+  %trailing = call i32 @llvm.cttz.i32(i32 %arg, i1 immarg true)
+  %shifted = lshr i32 %arg, %trailing
+  %r1.sroa.0.1 = select i1 %cmp, i32 0, i32 %shifted
+  ret i32 %r1.sroa.0.1
+}
+
+declare i32 @llvm.cttz.i32(i32, i1 immarg)