[llvm] 3836559 - [InstCombine] Test for regession with trunc in foldSelectICmpAnd

[Andreas Jonson via llvm-commits]

Author: Andreas Jonson
Date: 2025-02-19T21:45:41+01:00
New Revision: 3836559e65b002579e2c6697969557ffbbb8cc7d

URL: https://github.com/llvm/llvm-project/commit/3836559e65b002579e2c6697969557ffbbb8cc7d
DIFF: https://github.com/llvm/llvm-project/commit/3836559e65b002579e2c6697969557ffbbb8cc7d.diff

LOG: [InstCombine] Test for regession with trunc in foldSelectICmpAnd

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/select-icmp-and.ll

Removed: 
    


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diff  --git a/llvm/test/Transforms/InstCombine/select-icmp-and.ll b/llvm/test/Transforms/InstCombine/select-icmp-and.ll
index e49c2f6214114..16fb3f34047ee 100644
--- a/llvm/test/Transforms/InstCombine/select-icmp-and.ll
+++ b/llvm/test/Transforms/InstCombine/select-icmp-and.ll
@@ -900,3 +900,15 @@ define i8 @neg_select_trunc_bittest_to_shl_extra_use(i8 %x) {
   %ret = select i1 %trunc, i8 4, i8 0
   ret i8 %ret
 }
+
+define i16 @select_trunc_nuw_bittest_or(i8 %x) {
+; CHECK-LABEL: @select_trunc_nuw_bittest_or(
+; CHECK-NEXT:    [[TMP1:%.*]] = trunc nuw i8 [[X:%.*]] to i1
+; CHECK-NEXT:    [[RES:%.*]] = select i1 [[TMP1]], i16 20, i16 4
+; CHECK-NEXT:    ret i16 [[RES]]
+;
+  %trunc = trunc nuw i8 %x to i1
+  %select = select i1 %trunc, i16 16, i16 0
+  %res = or i16 4, %select
+  ret i16 %res
+}