derek.holloway
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86 lines
3.0 KiB
LLVM
86 lines
3.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Verify that strnlen calls with conditional expressions involving constant
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; string arguments with nonconstant bounds are folded correctly.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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declare i64 @strnlen(ptr, i64)
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@sx = external global [0 x i8]
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@s3 = constant [4 x i8] c"123\00"
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@s5 = constant [6 x i8] c"12345\00"
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@s5_3 = constant [10 x i8] c"12345\00abc\00"
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; Fold strnlen (C ? s3 + i : s5, %n) to min(C ? 3 : 5, i) when
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; s3 + i is guaranteed to be within the bounds of s3.
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define i64 @fold_strnlen_s3_pi_s5_n(i1 %C, i64 %i, i64 %n) {
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; CHECK-LABEL: @fold_strnlen_s3_pi_s5_n(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i8, ptr @s3, i64 [[I:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C:%.*]], ptr [[PTR]], ptr @s5
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr nonnull [[SEL]], i64 [[N:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [4 x i8], ptr @s3, i64 0, i64 %i
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%sel = select i1 %C, ptr %ptr, ptr @s5
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%len = call i64 @strnlen(ptr %sel, i64 %n)
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ret i64 %len
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}
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; Do not fold the same expression as above when s3 + i is not guaranteed
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; to be within the bounds of s3. Also verify that the call is not marked
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; noundef, nonnull, or dereferenceable because a zero bound implies no
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; access.
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define i64 @call_strnlen_s3_pi_xbounds_s5_n(i1 %C, i64 %i, i64 %n) {
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; CHECK-LABEL: @call_strnlen_s3_pi_xbounds_s5_n(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr i8, ptr @s3, i64 [[I:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C:%.*]], ptr [[PTR]], ptr @s5
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr [[SEL]], i64 [[N:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr [4 x i8], ptr @s3, i64 0, i64 %i
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%sel = select i1 %C, ptr %ptr, ptr @s5
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%len = call i64 @strnlen(ptr %sel, i64 %n)
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ret i64 %len
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}
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; Do not fold strnlen(C ? s3 + i : sx, n) when sx's length and size
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; are unknown. This also verifies that the folder cleans up the IR after
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; successfully folding the first subexpression IR when folding the second
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; subexpression fails.
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define i64 @call_strnlen_s3_pi_sx_n(i1 %C, i64 %i, i64 %n) {
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; CHECK-LABEL: @call_strnlen_s3_pi_sx_n(
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; CHECK-NEXT: [[PTR:%.*]] = getelementptr inbounds i8, ptr @s3, i64 [[I:%.*]]
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; CHECK-NEXT: [[SEL:%.*]] = select i1 [[C:%.*]], ptr [[PTR]], ptr @sx
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr nonnull [[SEL]], i64 [[N:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = getelementptr inbounds [4 x i8], ptr @s3, i64 0, i64 %i
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%sel = select i1 %C, ptr %ptr, ptr @sx
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%len = call i64 @strnlen(ptr %sel, i64 %n)
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ret i64 %len
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}
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; Fold strnlen (C ? s3 : s5 + i, n) to min(C ? 3 : 5, i).
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define i64 @fold_strnlen_s3_s5_pi_n(i1 %C, i64 %i, i64 %n) {
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; CHECK-LABEL: @fold_strnlen_s3_s5_pi_n(
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; CHECK-NEXT: [[PTR:%.*]] = select i1 [[C:%.*]], ptr @s5, ptr @s3
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; CHECK-NEXT: [[LEN:%.*]] = call i64 @strnlen(ptr nonnull [[PTR]], i64 [[I:%.*]])
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; CHECK-NEXT: ret i64 [[LEN]]
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;
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%ptr = select i1 %C, ptr @s5, ptr @s3
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%len = call i64 @strnlen(ptr %ptr, i64 %i)
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ret i64 %len
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}
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