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