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94473f4db6
Generate nuw GEPs for struct member accesses, as inbounds + non-negative implies nuw. Regression tests are updated using update scripts where possible, and by find + replace where not.
28 lines
1.1 KiB
C
28 lines
1.1 KiB
C
// 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 bpf -disable-llvm-passes -emit-llvm -o - %s | FileCheck %s
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// Check that call to preserve.static.offset is generated when field of
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// a struct marked with __attribute__((preserve_static_offset)) is accessed.
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#define __ctx __attribute__((preserve_static_offset))
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struct foo {
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int a;
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} __ctx;
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// CHECK-LABEL: define dso_local void @lvalue
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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: [[A:%.*]] = getelementptr inbounds nuw [[STRUCT_FOO:%.*]], ptr [[TMP1]], i32 0, i32 0
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// CHECK-NEXT: store i32 42, ptr [[A]], align 4
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// CHECK-NEXT: ret void
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//
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void lvalue(struct foo *p) {
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p->a = 42;
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}
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