32 lines
1.2 KiB
C
32 lines
1.2 KiB
C
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// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 2
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// REQUIRES: bpf-registered-target
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// RUN: %clang -cc1 -triple bpfel -disable-llvm-passes -S -emit-llvm -o - %s \
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// RUN: | FileCheck %s
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// Check that call to preserve.static.offset is generated when bitfield
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// from a struct marked with __attribute__((preserve_static_offset)) is
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// accessed.
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#define __ctx __attribute__((preserve_static_offset))
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struct foo {
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unsigned a:1;
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} __ctx;
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// CHECK-LABEL: define dso_local void @lvalue_bitfield
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// CHECK-SAME: (ptr noundef [[P:%.*]]) #[[ATTR0:[0-9]+]] {
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[P_ADDR:%.*]] = alloca ptr, align 8
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// CHECK-NEXT: store ptr [[P]], ptr [[P_ADDR]], align 8
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// CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr [[P_ADDR]], align 8
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// CHECK-NEXT: [[TMP1:%.*]] = call ptr @llvm.preserve.static.offset(ptr [[TMP0]])
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// CHECK-NEXT: [[BF_LOAD:%.*]] = load i8, ptr [[TMP1]], align 4
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// CHECK-NEXT: [[BF_CLEAR:%.*]] = and i8 [[BF_LOAD]], -2
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// CHECK-NEXT: [[BF_SET:%.*]] = or i8 [[BF_CLEAR]], 1
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// CHECK-NEXT: store i8 [[BF_SET]], ptr [[TMP1]], align 4
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// CHECK-NEXT: ret void
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//
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void lvalue_bitfield(struct foo *p) {
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p->a = 1;
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}
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