derek.holloway
7502bf64a4
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53 lines
1.7 KiB
LLVM
53 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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;
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; Verify that the result of memrchr calls with past-the-end pointers used
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; don't cause trouble and are optimally folded.
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declare i32 @memcmp(ptr, ptr, i64)
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@a5 = constant [5 x i8] c"12345";
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; Fold memcmp(a5, a5 + 5, n) to 0 on the assumption that n is 0 otherwise
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; the call would be undefined.
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define i32 @fold_memcmp_a5_a5p5_n(i64 %n) {
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; CHECK-LABEL: @fold_memcmp_a5_a5p5_n(
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; CHECK-NEXT: ret i32 0
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;
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%pa5_p5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%cmp = call i32 @memcmp(ptr @a5, ptr %pa5_p5, i64 %n)
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ret i32 %cmp
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}
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; Same as above but for memcmp(a5 + 5, a5 + 5, n).
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define i32 @fold_memcmp_a5p5_a5p5_n(i64 %n) {
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; CHECK-LABEL: @fold_memcmp_a5p5_a5p5_n(
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; CHECK-NEXT: ret i32 0
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;
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%pa5_p5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%qa5_p5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%cmp = call i32 @memcmp(ptr %pa5_p5, ptr %qa5_p5, i64 %n)
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ret i32 %cmp
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}
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; TODO: Likewise, fold memcmp(a5 + i, a5 + 5, n) to 0 on same basis.
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define i32 @fold_memcmp_a5pi_a5p5_n(i32 %i, i64 %n) {
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; CHECK-LABEL: @fold_memcmp_a5pi_a5p5_n(
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; CHECK-NEXT: [[TMP1:%.*]] = sext i32 [[I:%.*]] to i64
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; CHECK-NEXT: [[PA5_PI:%.*]] = getelementptr i8, ptr @a5, i64 [[TMP1]]
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; CHECK-NEXT: [[CMP:%.*]] = call i32 @memcmp(ptr [[PA5_PI]], ptr nonnull getelementptr inbounds nuw (i8, ptr @a5, i64 5), i64 [[N:%.*]])
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; CHECK-NEXT: ret i32 [[CMP]]
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;
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%pa5_pi = getelementptr [5 x i8], ptr @a5, i32 0, i32 %i
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%pa5_p5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%cmp = call i32 @memcmp(ptr %pa5_pi, ptr %pa5_p5, i64 %n)
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ret i32 %cmp
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}
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