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68b7cba2b0
Fixes the case where subsequent passes were unable to find and delete the invariant loop left over by the strlen idiom conversion. Since `loop-deletion` only operate on computable loops, we can update the loop condition to something more easily picked up by `loop-deletion` As pointed out in https://github.com/llvm/llvm-project/issues/134736
44 lines
2.1 KiB
LLVM
44 lines
2.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt < %s -S -passes=loop-idiom,loop-deletion | FileCheck %s
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define [2 x i64] @convert_null_terminated_to_bounded_ptr(ptr noundef %p) {
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; CHECK-LABEL: define [2 x i64] @convert_null_terminated_to_bounded_ptr(
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; CHECK-SAME: ptr noundef [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[WCSLEN:%.*]] = call i64 @wcslen(ptr [[P]])
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; CHECK-NEXT: br label %[[TERMINATED_BY_LOOP_END:.*]]
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; CHECK: [[TERMINATED_BY_LOOP_END]]:
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; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[WCSLEN]]
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; CHECK-NEXT: [[TERMINATED_BY_UPPER:%.*]] = getelementptr i8, ptr [[TMP0]], i64 4
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; CHECK-NEXT: [[TMP1:%.*]] = ptrtoint ptr [[P]] to i64
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; CHECK-NEXT: [[DOTFCA_0_INSERT:%.*]] = insertvalue [2 x i64] poison, i64 [[TMP1]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = ptrtoint ptr [[TERMINATED_BY_UPPER]] to i64
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; CHECK-NEXT: [[DOTFCA_1_INSERT:%.*]] = insertvalue [2 x i64] [[DOTFCA_0_INSERT]], i64 [[TMP2]], 1
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; CHECK-NEXT: ret [2 x i64] [[DOTFCA_1_INSERT]]
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;
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entry:
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br label %terminated_by.loop_cond
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terminated_by.loop_cond: ; preds = %terminated_by.loop_cond, %entry
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%terminated_by.len.0 = phi i64 [ 0, %entry ], [ %terminated_by.new_len, %terminated_by.loop_cond ]
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%0 = getelementptr inbounds i32, ptr %p, i64 %terminated_by.len.0
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%terminated_by.elem = load i32, ptr %0, align 4
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%terminted_by.check_terminator = icmp eq i32 %terminated_by.elem, 0
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%terminated_by.new_len = add i64 %terminated_by.len.0, 1
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br i1 %terminted_by.check_terminator, label %terminated_by.loop_end, label %terminated_by.loop_cond
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terminated_by.loop_end: ; preds = %terminated_by.loop_cond
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%1 = getelementptr inbounds i32, ptr %p, i64 %terminated_by.len.0
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%terminated_by.upper = getelementptr i8, ptr %1, i64 4
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%2 = ptrtoint ptr %p to i64
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%.fca.0.insert = insertvalue [2 x i64] poison, i64 %2, 0
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%3 = ptrtoint ptr %terminated_by.upper to i64
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%.fca.1.insert = insertvalue [2 x i64] %.fca.0.insert, i64 %3, 1
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ret [2 x i64] %.fca.1.insert
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 1, !"wchar_size", i32 4}
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