derek.holloway
7502bf64a4
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84 lines
2.4 KiB
LLVM
84 lines
2.4 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 memchr calls with past-the-end pointers used
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; in equality expressions don't cause trouble and either are folded when
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; they might be valid or not when they're provably undefined.
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declare ptr @memchr(ptr, i32, i64)
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@a5 = constant [5 x i8] c"12345"
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; Fold memchr(a5 + 5, c, 1) == a5 + 5 to an arbitrary constrant.
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; The call is transformed to a5[5] == c by the memchr simplifier, with
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; a5[5] being indeterminate. The equality then is the folded with
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; an undefined/arbitrary result.
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define i1 @call_memchr_ap5_c_1_eq_a(i32 %c, i64 %n) {
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; CHECK-LABEL: @call_memchr_ap5_c_1_eq_a(
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; CHECK-NEXT: ret i1 poison
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;
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%pap5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%qap5 = getelementptr [5 x i8], ptr @a5, i32 1, i32 0
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%q = call ptr @memchr(ptr %pap5, i32 %c, i64 1)
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%cmp = icmp eq ptr %q, %qap5
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ret i1 %cmp
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}
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; Fold memchr(a5 + 5, c, 5) == a5 + 5 to an arbitrary constant.
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define i1 @call_memchr_ap5_c_5_eq_a(i32 %c, i64 %n) {
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; CHECK-LABEL: @call_memchr_ap5_c_5_eq_a(
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; CHECK-NEXT: ret i1 poison
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;
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%pap5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%qap5 = getelementptr [5 x i8], ptr @a5, i32 1, i32 0
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%q = call ptr @memchr(ptr %pap5, i32 %c, i64 5)
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%cmp = icmp eq ptr %q, %qap5
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ret i1 %cmp
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}
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; Fold memchr(a5 + 5, c, n) == a5 to false.
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define i1 @fold_memchr_ap5_c_n_eq_a(i32 %c, i64 %n) {
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; CHECK-LABEL: @fold_memchr_ap5_c_n_eq_a(
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; CHECK-NEXT: ret i1 false
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;
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%pap5 = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%q = call ptr @memchr(ptr %pap5, i32 %c, i64 %n)
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%cmp = icmp eq ptr %q, @a5
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ret i1 %cmp
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}
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; Fold memchr(a5 + 5, c, n) == null to true on the basis that n must
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; be zero in order for the call to be valid.
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define i1 @fold_memchr_ap5_c_n_eqz(i32 %c, i64 %n) {
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; CHECK-LABEL: @fold_memchr_ap5_c_n_eqz(
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; CHECK-NEXT: ret i1 true
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;
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%p = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%q = call ptr @memchr(ptr %p, i32 %c, i64 %n)
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%cmp = icmp eq ptr %q, null
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ret i1 %cmp
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}
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; Fold memchr(a5 + 5, '\0', n) == null to true on the basis that n must
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; be zero in order for the call to be valid.
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define i1 @fold_memchr_a_nul_n_eqz(i64 %n) {
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; CHECK-LABEL: @fold_memchr_a_nul_n_eqz(
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; CHECK-NEXT: ret i1 true
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;
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%p = getelementptr [5 x i8], ptr @a5, i32 0, i32 5
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%q = call ptr @memchr(ptr %p, i32 0, i64 %n)
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%cmp = icmp eq ptr %q, null
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ret i1 %cmp
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}
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