99 lines
3.3 KiB
LLVM
99 lines
3.3 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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;
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; Verify that memrchr calls with a string consisting of all the same
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; characters are folded and those with mixed strings are not.
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declare ptr @memrchr(ptr, i32, i64)
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@a11111 = constant [5 x i8] c"\01\01\01\01\01"
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@a1110111 = constant [7 x i8] c"\01\01\01\00\01\01\01"
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; Fold memrchr(a11111, C, 5) to *a11111 == C ? a11111 + 5 - 1 : null.
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define ptr @fold_memrchr_a11111_c_5(i32 %C) {
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; CHECK-LABEL: @fold_memrchr_a11111_c_5(
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 1
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; CHECK-NEXT: [[MEMRCHR_SEL:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds ([5 x i8], ptr @a11111, i64 0, i64 4), ptr null
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; CHECK-NEXT: ret ptr [[MEMRCHR_SEL]]
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;
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%ret = call ptr @memrchr(ptr @a11111, i32 %C, i64 5)
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ret ptr %ret
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}
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; Fold memrchr(a11111, C, N) to N && *a11111 == C ? a11111 + N - 1 : null,
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; on the assumption that N is in bounds.
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define ptr @fold_memrchr_a11111_c_n(i32 %C, i64 %N) {
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; CHECK-LABEL: @fold_memrchr_a11111_c_n(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP2]], 1
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; CHECK-NEXT: [[TMP4:%.*]] = select i1 [[TMP1]], i1 [[TMP3]], i1 false
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; CHECK-NEXT: [[TMP5:%.*]] = getelementptr i8, ptr @a11111, i64 [[N]]
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; CHECK-NEXT: [[MEMRCHR_PTR_PLUS:%.*]] = getelementptr i8, ptr [[TMP5]], i64 -1
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; CHECK-NEXT: [[MEMRCHR_SEL:%.*]] = select i1 [[TMP4]], ptr [[MEMRCHR_PTR_PLUS]], ptr null
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; CHECK-NEXT: ret ptr [[MEMRCHR_SEL]]
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;
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%ret = call ptr @memrchr(ptr @a11111, i32 %C, i64 %N)
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ret ptr %ret
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}
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; Fold memrchr(a1110111, C, 3) to a1110111[2] == C ? a1110111 + 2 : null.
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define ptr @fold_memrchr_a1110111_c_3(i32 %C) {
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; CHECK-LABEL: @fold_memrchr_a1110111_c_3(
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 1
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; CHECK-NEXT: [[MEMRCHR_SEL:%.*]] = select i1 [[TMP2]], ptr getelementptr inbounds ([7 x i8], ptr @a1110111, i64 0, i64 2), ptr null
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; CHECK-NEXT: ret ptr [[MEMRCHR_SEL]]
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;
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%ret = call ptr @memrchr(ptr @a1110111, i32 %C, i64 3)
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ret ptr %ret
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}
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; Don't fold memrchr(a1110111, C, 4).
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define ptr @call_memrchr_a1110111_c_4(i32 %C) {
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; CHECK-LABEL: @call_memrchr_a1110111_c_4(
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; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(4) @a1110111, i32 [[C:%.*]], i64 4)
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; CHECK-NEXT: ret ptr [[RET]]
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;
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%ret = call ptr @memrchr(ptr @a1110111, i32 %C, i64 4)
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ret ptr %ret
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}
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; Don't fold memrchr(a1110111, C, 7).
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define ptr @call_memrchr_a1110111_c_7(i32 %C) {
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; CHECK-LABEL: @call_memrchr_a1110111_c_7(
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; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(7) @a1110111, i32 [[C:%.*]], i64 7)
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; CHECK-NEXT: ret ptr [[RET]]
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;
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%ret = call ptr @memrchr(ptr @a1110111, i32 %C, i64 7)
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ret ptr %ret
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}
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; Don't fold memrchr(a1110111, C, N).
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define ptr @call_memrchr_a1110111_c_n(i32 %C, i64 %N) {
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; CHECK-LABEL: @call_memrchr_a1110111_c_n(
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; CHECK-NEXT: [[RET:%.*]] = call ptr @memrchr(ptr nonnull @a1110111, i32 [[C:%.*]], i64 [[N:%.*]])
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; CHECK-NEXT: ret ptr [[RET]]
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;
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%ret = call ptr @memrchr(ptr @a1110111, i32 %C, i64 %N)
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ret ptr %ret
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}
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