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[InstCombine] Add additional memchr test (NFC) 

And fix some test names / comments.
This commit is contained in:
Martin Sebor 2022-04-04 10:32:40 +02:00 committed by Nikita Popov
parent 8cd1892725
commit 0f08875744
1 changed files with 21 additions and 6 deletions
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27
llvm/test/Transforms/InstCombine/memchr-2.ll
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@ -8,6 +8,7 @@ declare i8* @memchr(i8*, i32, i64)
@ax = external global [0 x i8]
@a12345 = constant [5 x i8] c"\01\02\03\04\05"
@a123f45 = constant [5 x i8] c"\01\02\03\f4\05"
; Fold memchr(a12345, '\06', n) to null.
@ -76,10 +77,24 @@ define i8* @fold_memchr_a12345_3_9() {
}
; Fold memchr(a12345, '\03', n) to n < 3 ? null : a12345 + 3.
; Fold memchr(a123f45, 500, 9) to a123f45 + 3 (verify that 500 is
; truncated to (unsigned char)500 == '\xf4')
define i8* @call_a12345_3_n(i64 %n) {
; CHECK-LABEL: @call_a12345_3_n(
define i8* @fold_memchr_a123f45_500_9() {
; CHECK-LABEL: @fold_memchr_a123f45_500_9(
; CHECK-NEXT: ret i8* getelementptr inbounds ([5 x i8], [5 x i8]* @a123f45, i64 0, i64 3)
;
%ptr = getelementptr [5 x i8], [5 x i8]* @a123f45, i32 0, i32 0
%res = call i8* @memchr(i8* %ptr, i32 500, i64 9)
ret i8* %res
}
; Fold memchr(a12345, '\03', n) to n < 3 ? null : a12345 + 2.
define i8* @fold_a12345_3_n(i64 %n) {
; CHECK-LABEL: @fold_a12345_3_n(
; CHECK-NEXT: [[RES:%.*]] = call i8* @memchr(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @a12345, i64 0, i64 0), i32 3, i64 [[N:%.*]])
; CHECK-NEXT: ret i8* [[RES]]
;
@ -90,11 +105,11 @@ define i8* @call_a12345_3_n(i64 %n) {
}
; Fold memchr(a12345, 259, n) to n < 4 ? null : a12345 + 3
; Fold memchr(a12345, 259, n) to n < 3 ? null : a12345 + 2
; to verify the constant 259 is converted to unsigned char (yielding 3).
define i8* @call_a12345_259_n(i64 %n) {
; CHECK-LABEL: @call_a12345_259_n(
define i8* @fold_a12345_259_n(i64 %n) {
; CHECK-LABEL: @fold_a12345_259_n(
; CHECK-NEXT: [[RES:%.*]] = call i8* @memchr(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @a12345, i64 0, i64 0), i32 259, i64 [[N:%.*]])
; CHECK-NEXT: ret i8* [[RES]]
;