34 changes: 34 additions & 0 deletions llvm/test/Transforms/InstCombine/mul-pow2.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -102,3 +102,37 @@ define <2 x i8> @mul_x_selectp2_vec(<2 x i8> %xx, i1 %c) {
%r = mul <2 x i8> %x, %s
ret <2 x i8> %r
}


define i8 @shl_add_log_may_cause_poison_pr62175_fail(i8 %x, i8 %y) {
; CHECK-LABEL: @shl_add_log_may_cause_poison_pr62175_fail(
; CHECK-NEXT: [[SHL:%.*]] = shl i8 4, [[X:%.*]]
; CHECK-NEXT: [[MUL:%.*]] = mul i8 [[SHL]], [[Y:%.*]]
; CHECK-NEXT: ret i8 [[MUL]]
;
%shl = shl i8 4, %x
%mul = mul i8 %y, %shl
ret i8 %mul
}

define i8 @shl_add_log_may_cause_poison_pr62175_with_nuw(i8 %x, i8 %y) {
; CHECK-LABEL: @shl_add_log_may_cause_poison_pr62175_with_nuw(
; CHECK-NEXT: [[TMP1:%.*]] = add i8 [[X:%.*]], 2
; CHECK-NEXT: [[MUL:%.*]] = shl i8 [[Y:%.*]], [[TMP1]]
; CHECK-NEXT: ret i8 [[MUL]]
;
%shl = shl nuw i8 4, %x
%mul = mul i8 %y, %shl
ret i8 %mul
}

define i8 @shl_add_log_may_cause_poison_pr62175_with_nsw(i8 %x, i8 %y) {
; CHECK-LABEL: @shl_add_log_may_cause_poison_pr62175_with_nsw(
; CHECK-NEXT: [[TMP1:%.*]] = add i8 [[X:%.*]], 2
; CHECK-NEXT: [[MUL:%.*]] = shl i8 [[Y:%.*]], [[TMP1]]
; CHECK-NEXT: ret i8 [[MUL]]
;
%shl = shl nsw i8 4, %x
%mul = mul i8 %y, %shl
ret i8 %mul
}