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clang-p2996/llvm/test/Transforms/InstCombine/strcmp-3.ll
Martin Sebor cc2ce81bd8 [SimplifyLibcalls] Tests for libcall folding of subobjects [NFC] 
Add tests exercising the future enancement of folding library function
calls with arguments involving subobjects such as elements of arrays
or struct members.
2022-05-06 10:43:02 -06:00

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