derek.holloway
7502bf64a4
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63 lines
2.2 KiB
LLVM
63 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify the strrchr("", c) to (unsigned char)c ? "" : 0 transformetion.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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@s10 = constant [11 x i8] c"0123456789\00"
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declare ptr @strrchr(ptr, i32)
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; Fold strrchr(s + 10, c) to (unsigned char)c ? 0 : s + 10.
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define ptr @fold_strrchr_sp10_x(i32 %c) {
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; CHECK-LABEL: @fold_strrchr_sp10_x(
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[MEMRCHR_CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], 0
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; CHECK-NEXT: [[MEMRCHR_SEL:%.*]] = select i1 [[MEMRCHR_CHAR0CMP]], ptr getelementptr inbounds nuw (i8, ptr @s10, i64 10), ptr null
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; CHECK-NEXT: ret ptr [[MEMRCHR_SEL]]
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;
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%psp10 = getelementptr [11 x i8], ptr @s10, i32 0, i32 10
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%pc = call ptr @strrchr(ptr %psp10, i32 %c)
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ret ptr %pc
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}
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; Transform strrchr(s + 9, c) to [the equivalent of] memrchr(s + 9, c, 2).
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define ptr @call_strrchr_sp9_x(i32 %c) {
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; CHECK-LABEL: @call_strrchr_sp9_x(
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; CHECK-NEXT: [[MEMRCHR:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(2) getelementptr inbounds nuw (i8, ptr @s10, i64 9), i32 [[C:%.*]], i64 2)
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; CHECK-NEXT: ret ptr [[MEMRCHR]]
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;
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%psp9 = getelementptr [11 x i8], ptr @s10, i32 0, i32 9
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%pc = call ptr @strrchr(ptr %psp9, i32 %c)
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ret ptr %pc
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}
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; Do not transform strrchr(s + 2, c) (for short strings this could be
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; folded into a chain of OR expressions ala D128011).
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define ptr @call_strrchr_sp2_x(i32 %c) {
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; CHECK-LABEL: @call_strrchr_sp2_x(
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; CHECK-NEXT: [[MEMRCHR:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(9) getelementptr inbounds nuw (i8, ptr @s10, i64 2), i32 [[C:%.*]], i64 9)
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; CHECK-NEXT: ret ptr [[MEMRCHR]]
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;
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%psp2 = getelementptr [11 x i8], ptr @s10, i32 0, i32 2
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%pc = call ptr @strrchr(ptr %psp2, i32 %c)
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ret ptr %pc
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}
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; Do not transform strrchr(s + 1, c).
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define ptr @call_strrchr_sp1_x(i32 %c) {
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; CHECK-LABEL: @call_strrchr_sp1_x(
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; CHECK-NEXT: [[MEMRCHR:%.*]] = call ptr @memrchr(ptr noundef nonnull dereferenceable(10) getelementptr inbounds nuw (i8, ptr @s10, i64 1), i32 [[C:%.*]], i64 10)
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; CHECK-NEXT: ret ptr [[MEMRCHR]]
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;
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%psp1 = getelementptr [11 x i8], ptr @s10, i32 0, i32 1
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%pc = call ptr @strrchr(ptr %psp1, i32 %c)
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ret ptr %pc
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}
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