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llvm-project/clang/test/CodeGen/arm-byval-align.c

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ARM: Correct alignment of structs passed as byval pointer When a struct has bitfields overlapping with other members (as required by the AAPCS), clang uses a packed struct to represent this. If such a struct is large enough for clang to pass it as a byval pointer (>64 bytes), we need to set the alignment of the argument to match the original type. llvm-svn: 203660
2014-03-12 22:02:50 +08:00
// RUN: %clang_cc1 -triple=armv7-none-eabi < %s -S -emit-llvm | FileCheck %s
struct foo {
long long a;
char b;
int c:16;
int d[16];
};
LLVM IR: Generate new-style byval-with-Type from Clang LLVM IR recently added a Type parameter to the byval Attribute, so that when pointers become opaque and no longer have an element type the information will still be present in IR. For now the Type parameter is optional (which is why Clang didn't need this change at the time), but it will become mandatory soon. llvm-svn: 362652
2019-06-06 05:12:14 +08:00
// CHECK: %struct.foo* byval(%struct.foo) align 8 %z
ARM: Correct alignment of structs passed as byval pointer When a struct has bitfields overlapping with other members (as required by the AAPCS), clang uses a packed struct to represent this. If such a struct is large enough for clang to pass it as a byval pointer (>64 bytes), we need to set the alignment of the argument to match the original type. llvm-svn: 203660
2014-03-12 22:02:50 +08:00
long long bar(int a, int b, int c, int d, int e,
struct foo z) {
return z.a;
}