[llvm] d515211 - [InstCombine] Relax test to avoid Darwin failure.

[Martin Sebor via llvm-commits]

Author: Martin Sebor
Date: 2022-06-29T10:51:27-06:00
New Revision: d515211a0ce184e967310ec8b9541c77ef776dda

URL: https://github.com/llvm/llvm-project/commit/d515211a0ce184e967310ec8b9541c77ef776dda
DIFF: https://github.com/llvm/llvm-project/commit/d515211a0ce184e967310ec8b9541c77ef776dda.diff

LOG: [InstCombine] Relax test to avoid Darwin failure.

Avoid testing folding of atoi calls with out-of-bounds pointers.

Added: 
    

Modified: 
    llvm/test/Transforms/InstCombine/str-int-3.ll

Removed: 
    


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diff  --git a/llvm/test/Transforms/InstCombine/str-int-3.ll b/llvm/test/Transforms/InstCombine/str-int-3.ll
index 916d3fed5b45..0ebbc8299450 100644
--- a/llvm/test/Transforms/InstCombine/str-int-3.ll
+++ b/llvm/test/Transforms/InstCombine/str-int-3.ll
@@ -57,20 +57,21 @@ define void @fold_atoi_member(i32* %pi) {
 }
 
 
-; Fold atoi with an excessive offset.  It's undefined so folding it to zero
-; is valid and might prevent crashes or returning a bogus value, even though
-; it prevents detecting the bug by sanitizers.
-
-define void @call_atoi_offset_out_of_bounds(i32* %pi) {
-; CHECK-LABEL: @call_atoi_offset_out_of_bounds(
-; CHECK-NEXT:    store i32 0, i32* [[PI:%.*]], align 4
-; CHECK-NEXT:    [[IA_0_0_33:%.*]] = call i32 @atoi(i8* getelementptr ([2 x %struct.A], [2 x %struct.A]* @a, i64 1, i64 0, i32 0, i64 1))
-; CHECK-NEXT:    store i32 [[IA_0_0_33]], i32* [[PI]], align 4
-; CHECK-NEXT:    ret void
+; TODO: Fold atoi with an excessive offset.  It's undefined so folding it
+; to zero is valid and might prevent crashes or returning a bogus value,
+; even though it prevents detecting the bug by sanitizers.
+; This is not fully implemented because the out-of-bounds offset results
+; in the empty string which atoi (via strtol) is required to interpret as
+; a zero but for which it may set errno to EINVAL.  To fold only
+; the undefined calls the folder would have to 
diff erentiate between
+; the empty string an out-of-bounds pointer.
+
+define void @fold_atoi_offset_out_of_bounds(i32* %pi) {
+; CHECK-LABEL: @fold_atoi_offset_out_of_bounds(
+; TODO: Check folding.
 ;
 ; Fold atoi((const char*)a + sizeof a) to zero.
-  %pa_0_0_32 = getelementptr [2 x %struct.A], [2 x %struct.A]* @a, i64 0, i64 0, i32 0, i64 32
-  %ia_0_0_32 = call i32 @atoi(i8* %pa_0_0_32)
+  %ia_0_0_32 = call i32 @atoi(i8* getelementptr inbounds ([2 x %struct.A], [2 x %struct.A]* @a, i64 1, i64 0, i32 0, i64 0))
   %pia_0_0_32 = getelementptr i32, i32* %pi, i32 0
   store i32 %ia_0_0_32, i32* %pia_0_0_32