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2a2847823f
Target-dependent constant folding will fold these down to simple constants (or at least, expressions that don't involve a GEP). We don't need heroics to try to optimize the form of the expression before that happens. Fixes https://bugs.llvm.org/show_bug.cgi?id=51232 . Differential Revision: https://reviews.llvm.org/D107116
26 lines
830 B
C++
26 lines
830 B
C++
// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py
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// RUN: %clang_cc1 -x c++ -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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// RUN: %clang_cc1 -x c++ -fsanitize=pointer-overflow -fno-sanitize-recover=pointer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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#include <stdint.h>
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struct S {
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int x, y;
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};
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// CHECK-LABEL: @_Z23get_offset_of_y_naivelyv(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: ret i64 ptrtoint (i32* getelementptr inbounds ([[STRUCT_S:%.*]], %struct.S* null, i32 0, i32 1) to i64)
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//
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uintptr_t get_offset_of_y_naively() {
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return ((uintptr_t)(&(((S *)nullptr)->y)));
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}
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// CHECK-LABEL: @_Z27get_offset_of_y_via_builtinv(
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// CHECK-NEXT: entry:
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// CHECK-NEXT: ret i64 4
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//
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uintptr_t get_offset_of_y_via_builtin() {
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return __builtin_offsetof(S, y);
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}
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