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63 lines
1.8 KiB
LLVM
63 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the strcspn library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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@abcba = constant [6 x i8] c"abcba\00"
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@abc = constant [4 x i8] c"abc\00"
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@null = constant [1 x i8] zeroinitializer
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declare i64 @strcspn(i8*, i8*)
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; Check strcspn(s, "") -> strlen(s).
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define i64 @test_simplify1(i8* %str) {
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; CHECK-LABEL: @test_simplify1(
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; CHECK-NEXT: [[STRLEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[STR:%.*]])
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; CHECK-NEXT: ret i64 [[STRLEN]]
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;
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%pat = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
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%ret = call i64 @strcspn(i8* %str, i8* %pat)
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ret i64 %ret
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}
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; Check strcspn("", s) -> 0.
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define i64 @test_simplify2(i8* %pat) {
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; CHECK-LABEL: @test_simplify2(
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; CHECK-NEXT: ret i64 0
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;
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%str = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
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%ret = call i64 @strcspn(i8* %str, i8* %pat)
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ret i64 %ret
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}
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; Check strcspn(s1, s2), where s1 and s2 are constants.
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define i64 @test_simplify3() {
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; CHECK-LABEL: @test_simplify3(
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; CHECK-NEXT: ret i64 0
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;
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%str = getelementptr [6 x i8], [6 x i8]* @abcba, i32 0, i32 0
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%pat = getelementptr [4 x i8], [4 x i8]* @abc, i32 0, i32 0
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%ret = call i64 @strcspn(i8* %str, i8* %pat)
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ret i64 %ret
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}
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; Check cases that shouldn't be simplified.
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define i64 @test_no_simplify1(i8* %str, i8* %pat) {
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; CHECK-LABEL: @test_no_simplify1(
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; CHECK-NEXT: [[RET:%.*]] = call i64 @strcspn(i8* [[STR:%.*]], i8* [[PAT:%.*]])
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; CHECK-NEXT: ret i64 [[RET]]
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;
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%ret = call i64 @strcspn(i8* %str, i8* %pat)
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ret i64 %ret
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}
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