derek.holloway
7502bf64a4
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127 lines
3.2 KiB
LLVM
127 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Verify that memchr calls with constant arrays, or constant characters,
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; or constant bounds are folded (or not) as expected.
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declare ptr @memchr(ptr, i32, i64)
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@ax = external global [0 x i8]
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@a12345 = constant [5 x i8] c"\01\02\03\04\05"
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@a123f45 = constant [5 x i8] c"\01\02\03\f4\05"
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; Fold memchr(a12345, '\06', n) to null.
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define ptr @fold_memchr_a12345_6_n(i64 %n) {
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; CHECK-LABEL: @fold_memchr_a12345_6_n(
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; CHECK-NEXT: ret ptr null
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;
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%res = call ptr @memchr(ptr @a12345, i32 6, i64 %n)
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ret ptr %res
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}
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; Fold memchr(a12345, '\04', 2) to null.
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define ptr @fold_memchr_a12345_4_2() {
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; CHECK-LABEL: @fold_memchr_a12345_4_2(
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; CHECK-NEXT: ret ptr null
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;
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%res = call ptr @memchr(ptr @a12345, i32 4, i64 2)
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ret ptr %res
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}
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; Fold memchr(a12345, '\04', 3) to null.
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define ptr @fold_memchr_a12345_4_3() {
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; CHECK-LABEL: @fold_memchr_a12345_4_3(
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; CHECK-NEXT: ret ptr null
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;
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%res = call ptr @memchr(ptr @a12345, i32 4, i64 3)
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ret ptr %res
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}
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; Fold memchr(a12345, '\03', 3) to a12345 + 2.
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define ptr @fold_memchr_a12345_3_3() {
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; CHECK-LABEL: @fold_memchr_a12345_3_3(
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; CHECK-NEXT: ret ptr getelementptr inbounds nuw (i8, ptr @a12345, i64 2)
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;
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%res = call ptr @memchr(ptr @a12345, i32 3, i64 3)
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ret ptr %res
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}
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; Fold memchr(a12345, '\03', 9) to a12345 + 2.
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define ptr @fold_memchr_a12345_3_9() {
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; CHECK-LABEL: @fold_memchr_a12345_3_9(
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; CHECK-NEXT: ret ptr getelementptr inbounds nuw (i8, ptr @a12345, i64 2)
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;
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%res = call ptr @memchr(ptr @a12345, i32 3, i64 9)
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ret ptr %res
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}
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; Fold memchr(a123f45, 500, 9) to a123f45 + 3 (verify that 500 is
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; truncated to (unsigned char)500 == '\xf4')
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define ptr @fold_memchr_a123f45_500_9() {
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; CHECK-LABEL: @fold_memchr_a123f45_500_9(
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; CHECK-NEXT: ret ptr getelementptr inbounds nuw (i8, ptr @a123f45, i64 3)
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;
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%res = call ptr @memchr(ptr @a123f45, i32 500, i64 9)
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ret ptr %res
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}
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; Fold memchr(a12345, '\03', n) to n < 3 ? null : a12345 + 2.
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define ptr @fold_a12345_3_n(i64 %n) {
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; CHECK-LABEL: @fold_a12345_3_n(
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; CHECK-NEXT: [[MEMCHR_CMP:%.*]] = icmp ult i64 [[N:%.*]], 3
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; CHECK-NEXT: [[RES:%.*]] = select i1 [[MEMCHR_CMP]], ptr null, ptr getelementptr inbounds nuw (i8, ptr @a12345, i64 2)
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; CHECK-NEXT: ret ptr [[RES]]
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;
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%res = call ptr @memchr(ptr @a12345, i32 3, i64 %n)
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ret ptr %res
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}
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; Fold memchr(a12345, 259, n) to n < 3 ? null : a12345 + 2
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; to verify the constant 259 is converted to unsigned char (yielding 3).
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define ptr @fold_a12345_259_n(i64 %n) {
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; CHECK-LABEL: @fold_a12345_259_n(
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; CHECK-NEXT: [[MEMCHR_CMP:%.*]] = icmp ult i64 [[N:%.*]], 3
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; CHECK-NEXT: [[RES:%.*]] = select i1 [[MEMCHR_CMP]], ptr null, ptr getelementptr inbounds nuw (i8, ptr @a12345, i64 2)
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; CHECK-NEXT: ret ptr [[RES]]
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;
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%res = call ptr @memchr(ptr @a12345, i32 259, i64 %n)
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ret ptr %res
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}
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; Do no fold memchr(ax, 1, n).
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define ptr @call_ax_1_n(i64 %n) {
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; CHECK-LABEL: @call_ax_1_n(
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; CHECK-NEXT: [[RES:%.*]] = call ptr @memchr(ptr nonnull @ax, i32 1, i64 [[N:%.*]])
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; CHECK-NEXT: ret ptr [[RES]]
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;
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%res = call ptr @memchr(ptr @ax, i32 1, i64 %n)
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ret ptr %res
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}
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