cc2ce81bd8
Add tests exercising the future enancement of folding library function calls with arguments involving subobjects such as elements of arrays or struct members.
79 lines
2.8 KiB
LLVM
79 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify that strlen calls with variable offsets into elements of constant
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; arrays are folded.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare i64 @strlen(i8*)
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@a5_4 = constant [5 x [4 x i8]] [[4 x i8] c"123\00", [4 x i8] c"12\00\00", [4 x i8] c"1\00\00\00", [4 x i8] zeroinitializer, [4 x i8] zeroinitializer]
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; Fold strlen(&a5_4[0][I]) to I <= 3 ? 3 - I : 0.
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define i64 @fold_a5_4_i0_pI(i64 %I) {
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; CHECK-LABEL: @fold_a5_4_i0_pI(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 0, i64 [[I:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 0, i64 %I
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%len = call i64 @strlen(i8* %ptr)
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ret i64 %len
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}
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; Fold strlen(&a5_4[1][I]) to I <= 2 ? 2 - I : 0.
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define i64 @fold_a5_4_i1_pI(i64 %I) {
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; CHECK-LABEL: @fold_a5_4_i1_pI(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 1, i64 [[I:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 1, i64 %I
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%len = call i64 @strlen(i8* %ptr)
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ret i64 %len
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}
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; Fold strlen(&a5_4[2][I]) to i <= 1 ? 1 - I : 0.
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define i64 @fold_a5_4_i2_pI(i64 %I) {
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; CHECK-LABEL: @fold_a5_4_i2_pI(
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 2, i64 1))
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 2, i64 1
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%len = call i64 @strlen(i8* %ptr)
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ret i64 %len
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}
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; Fold strlen(&a5_4[3][I]) to 0.
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define i64 @fold_a5_4_i3_pI_to_0(i64 %I) {
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; CHECK-LABEL: @fold_a5_4_i3_pI_to_0(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 3, i64 [[I:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 3, i64 %I
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%len = call i64 @strlen(i8* %ptr)
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ret i64 %len
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}
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; Fold strlen(&a5_4[4][I]) to 0.
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define i64 @fold_a5_4_i4_pI_to_0(i64 %I) {
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; CHECK-LABEL: @fold_a5_4_i4_pI_to_0(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 4, i64 [[I:%.*]]
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 4, i64 %I
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%len = call i64 @strlen(i8* %ptr)
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ret i64 %len
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}
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