120 lines
3.5 KiB
LLVM
120 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify that strlen calls with elements of constant arrays are folded.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare i32 @strcmp(ptr, ptr)
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@a5 = constant [5 x [4 x i8]] [[4 x i8] c"123\00", [4 x i8] c"123\00", [4 x i8] c"12\00\00", [4 x i8] zeroinitializer, [4 x i8] zeroinitializer]
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; Fold strcmp(a5[0], a5[1]) to '1' - '1'.
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define i32 @fold_strcmp_a5i0_a5i1_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_a5i1_to_0(
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; CHECK-NEXT: ret i32 0
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 0
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Do not fold strcmp(a5[0], a5[I]) where the index I is not constant.
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define i32 @call_strcmp_a5i0_a5iI(i64 %I) {
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; CHECK-LABEL: @call_strcmp_a5i0_a5iI(
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; CHECK-NEXT: [[Q:%.*]] = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 [[I:%.*]], i64 0
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(4) @a5, ptr noundef nonnull dereferenceable(1) [[Q]])
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 %I, i64 0
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Same as above but for strcmp(a5[I], a5[0]).
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define i32 @call_strcmp_a5iI_a5i0(i64 %I) {
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; CHECK-LABEL: @call_strcmp_a5iI_a5i0(
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; CHECK-NEXT: [[P:%.*]] = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 [[I:%.*]], i64 0
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(1) [[P]], ptr noundef nonnull dereferenceable(4) @a5)
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%p = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 %I, i64 0
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%cmp = call i32 @strcmp(ptr %p, ptr @a5)
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ret i32 %cmp
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}
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; Fold strcmp(a5[0], &a5[1][1]) to '1' - '2'.
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define i32 @fold_strcmp_a5i0_a5i1_p1_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_a5i1_p1_to_0(
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; CHECK-NEXT: ret i32 -1
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 1
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Do not fold strcmp(a5[0], &a5[1][I]) when the index I is not constant.
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define i32 @call_strcmp_a5i0_a5i1_pI(i64 %I) {
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; CHECK-LABEL: @call_strcmp_a5i0_a5i1_pI(
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; CHECK-NEXT: [[Q:%.*]] = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 [[I:%.*]]
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @strcmp(ptr noundef nonnull dereferenceable(4) @a5, ptr noundef nonnull dereferenceable(1) [[Q]])
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 %I
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Fold strcmp(&a5[0][1], a5[1]) to '2' - '1'.
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define i32 @fold_strcmp_a5i0_p1_a5i1_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_p1_a5i1_to_0(
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; CHECK-NEXT: ret i32 1
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;
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%p = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 0, i64 1
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 1, i64 0
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%cmp = call i32 @strcmp(ptr %p, ptr %q)
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ret i32 %cmp
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}
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; Fold strcmp(a5[0], a5[2]) to a5[0][2] - a5[2][2] or 1.
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define i32 @fold_strcmp_a5i0_a5i2_to_0() {
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; CHECK-LABEL: @fold_strcmp_a5i0_a5i2_to_0(
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; CHECK-NEXT: ret i32 1
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 2, i64 0
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%cmp = call i32 @strcmp(ptr @a5, ptr %q)
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ret i32 %cmp
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}
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; Fold strcmp(a5[2], a5[0]) to a5[0][2] - a5[2][2] or 1.
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define i32 @fold_strcmp_a5i2_a5i0_to_m1() {
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; CHECK-LABEL: @fold_strcmp_a5i2_a5i0_to_m1(
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; CHECK-NEXT: ret i32 -1
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;
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%q = getelementptr [5 x [4 x i8]], ptr @a5, i64 0, i64 2, i64 0
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%cmp = call i32 @strcmp(ptr %q, ptr @a5)
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ret i32 %cmp
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}
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