| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt < %s -passes=instcombine -S | FileCheck %s |
| ; |
| ; Verify that strchr calls with a string consisting of one or two sequences |
| ; of all the same characters are folded and those with mixed strings are not. |
| |
| @s1 = constant [2 x i8] c"\01\00" |
| @s11 = constant [3 x i8] c"\01\01\00" |
| @s111 = constant [4 x i8] c"\01\01\01\00" |
| @s000 = constant [4 x i8] c"\00\00\00\00" |
| @s11102 = constant [6 x i8] c"\01\01\01\00\02\00" |
| @s21111 = constant [6 x i8] c"\02\01\01\01\01\00" |
| |
| declare i8* @strchr(i8*, i32) |
| |
| |
| ; Fold strchr(S = "\01", C) to C == '\01' ? S : C == '\0' ? S + 1 : null. |
| |
| define i8* @fold_strchr_s1_C(i32 %C) { |
| ; CHECK-LABEL: @fold_strchr_s1_C( |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0 |
| ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @s1, i64 0, i64 1), i8* null |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1 |
| ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @s1, i64 0, i64 0), i8* [[MEMCHR_SEL1]] |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL2]] |
| ; |
| %ptr = getelementptr inbounds [2 x i8], [2 x i8]* @s1, i64 0, i64 0 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |
| |
| |
| ; Fold strchr(S = "\01\01", C) to C == '\01' ? S : C == '\0' ? S + 2 : null. |
| |
| define i8* @fold_strchr_s11_C(i32 %C) { |
| ; CHECK-LABEL: @fold_strchr_s11_C( |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0 |
| ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], i8* getelementptr inbounds ([3 x i8], [3 x i8]* @s11, i64 0, i64 2), i8* null |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1 |
| ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], i8* getelementptr inbounds ([3 x i8], [3 x i8]* @s11, i64 0, i64 0), i8* [[MEMCHR_SEL1]] |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL2]] |
| ; |
| %ptr = getelementptr inbounds [3 x i8], [3 x i8]* @s11, i64 0, i64 0 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |
| |
| |
| ; Fold strchr(S = "\01\01\01", C) to C == '\01' ? S : C == '\0' ? S + 3 : null. |
| |
| define i8* @fold_strchr_s111_C(i32 %C) { |
| ; CHECK-LABEL: @fold_strchr_s111_C( |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0 |
| ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], i8* getelementptr inbounds ([4 x i8], [4 x i8]* @s111, i64 0, i64 3), i8* null |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1 |
| ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], i8* getelementptr inbounds ([4 x i8], [4 x i8]* @s111, i64 0, i64 0), i8* [[MEMCHR_SEL1]] |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL2]] |
| ; |
| %ptr = getelementptr inbounds [4 x i8], [4 x i8]* @s111, i64 0, i64 0 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |
| |
| |
| ; Fold strchr(S = "\00\00\00", C) to C == '\0' ? S : null. |
| |
| define i8* @fold_strchr_s000_C(i32 %C) { |
| ; CHECK-LABEL: @fold_strchr_s000_C( |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 |
| ; CHECK-NEXT: [[MEMCHR_CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], 0 |
| ; CHECK-NEXT: [[MEMCHR_SEL:%.*]] = select i1 [[MEMCHR_CHAR0CMP]], i8* getelementptr inbounds ([4 x i8], [4 x i8]* @s000, i64 0, i64 0), i8* null |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL]] |
| ; |
| %ptr = getelementptr inbounds [4 x i8], [4 x i8]* @s000, i64 0, i64 0 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |
| |
| |
| ; Do not fold strchr(S = "\02\01\01\01\01", C). It's transformed to |
| ; memchr(S, C, 6). |
| |
| define i8* @xform_strchr_s21111_C(i32 %C) { |
| ; CHECK-LABEL: @xform_strchr_s21111_C( |
| ; CHECK-NEXT: [[MEMCHR:%.*]] = call i8* @memchr(i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([6 x i8], [6 x i8]* @s21111, i64 0, i64 0), i32 [[C:%.*]], i64 6) |
| ; CHECK-NEXT: ret i8* [[MEMCHR]] |
| ; |
| %ptr = getelementptr inbounds [6 x i8], [6 x i8]* @s21111, i64 0, i64 0 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |
| |
| |
| ; Fold strchr(S = "\02\01\01\01\01" + 1, C) to |
| ; C == '\01' ? S + 1 : C == '\0' ? S + 5 : null. |
| |
| define i8* @fold_strchr_s21111p1_C(i32 %C) { |
| ; CHECK-LABEL: @fold_strchr_s21111p1_C( |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0 |
| ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], i8* getelementptr inbounds ([6 x i8], [6 x i8]* @s21111, i64 0, i64 5), i8* null |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1 |
| ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], i8* getelementptr inbounds ([6 x i8], [6 x i8]* @s21111, i64 0, i64 1), i8* [[MEMCHR_SEL1]] |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL2]] |
| ; |
| %ptr = getelementptr inbounds [6 x i8], [6 x i8]* @s21111, i64 0, i64 1 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |
| |
| ; Fold strchr(S = "\01\01\01\00\02", C) to |
| ; C == '\01' ? S : C == '\0' ? S + 3 : null. |
| |
| define i8* @fold_strchr_s11102_C(i32 %C) { |
| ; CHECK-LABEL: @fold_strchr_s11102_C( |
| ; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8 |
| ; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i8 [[TMP1]], 0 |
| ; CHECK-NEXT: [[MEMCHR_SEL1:%.*]] = select i1 [[TMP2]], i8* getelementptr inbounds ([6 x i8], [6 x i8]* @s11102, i64 0, i64 3), i8* null |
| ; CHECK-NEXT: [[TMP3:%.*]] = icmp eq i8 [[TMP1]], 1 |
| ; CHECK-NEXT: [[MEMCHR_SEL2:%.*]] = select i1 [[TMP3]], i8* getelementptr inbounds ([6 x i8], [6 x i8]* @s11102, i64 0, i64 0), i8* [[MEMCHR_SEL1]] |
| ; CHECK-NEXT: ret i8* [[MEMCHR_SEL2]] |
| ; |
| %ptr = getelementptr inbounds [6 x i8], [6 x i8]* @s11102, i64 0, i64 0 |
| %ret = call i8* @strchr(i8* %ptr, i32 %C) |
| ret i8* %ret |
| } |