derek.holloway
7502bf64a4
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79 lines
2.1 KiB
LLVM
79 lines
2.1 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 strchr calls used in equality expressions
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; with either the first argument or null are optimally folded.
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declare ptr @strchr(ptr, i32)
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; Fold strchr(s, c) == s to *s == c.
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define i1 @fold_strchr_s_c_eq_s(ptr %s, i32 %c) {
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; CHECK-LABEL: @fold_strchr_s_c_eq_s(
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; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[S:%.*]], align 1
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; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], [[TMP2]]
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; CHECK-NEXT: ret i1 [[CHAR0CMP]]
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;
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%p = call ptr @strchr(ptr %s, i32 %c)
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%cmp = icmp eq ptr %p, %s
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ret i1 %cmp
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}
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; Fold strchr(s, c) != s to *s != c.
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define i1 @fold_strchr_s_c_neq_s(ptr %s, i32 %c) {
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; CHECK-LABEL: @fold_strchr_s_c_neq_s(
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; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[S:%.*]], align 1
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; CHECK-NEXT: [[TMP2:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[CHAR0CMP:%.*]] = icmp ne i8 [[TMP1]], [[TMP2]]
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; CHECK-NEXT: ret i1 [[CHAR0CMP]]
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;
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%p = call ptr @strchr(ptr %s, i32 %c)
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%cmp = icmp ne ptr %p, %s
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ret i1 %cmp
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}
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; Fold strchr(s, '\0') == null to false. (A string must be nul-terminated,
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; otherwise the call would read past the end of the array.)
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define i1 @fold_strchr_s_nul_eqz(ptr %s) {
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; CHECK-LABEL: @fold_strchr_s_nul_eqz(
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; CHECK-NEXT: ret i1 false
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;
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%p = call ptr @strchr(ptr %s, i32 0)
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%cmp = icmp eq ptr %p, null
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ret i1 %cmp
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}
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; Fold strchr(s, '\0') != null to true.
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define i1 @fold_strchr_s_nul_nez(ptr %s) {
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; CHECK-LABEL: @fold_strchr_s_nul_nez(
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; CHECK-NEXT: ret i1 true
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;
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%p = call ptr @strchr(ptr %s, i32 0)
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%cmp = icmp ne ptr %p, null
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ret i1 %cmp
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}
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@a5 = constant [5 x i8] c"12345";
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; Fold strchr(a5, c) == a5 to *a5 == c.
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define i1 @fold_strchr_a_c_eq_a(i32 %c) {
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; CHECK-LABEL: @fold_strchr_a_c_eq_a(
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i32 [[C:%.*]] to i8
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; CHECK-NEXT: [[CHAR0CMP:%.*]] = icmp eq i8 [[TMP1]], 49
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; CHECK-NEXT: ret i1 [[CHAR0CMP]]
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;
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%q = call ptr @strchr(ptr @a5, i32 %c)
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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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