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Reapply r134946 with fixes. Tested on Benjamin testcase and other test-suite failures. 

llvm-svn: 135091
This commit is contained in:
Bruno Cardoso Lopes 2011-07-13 21:58:55 +00:00
parent ad69e65a39
commit 98154a76fd
3 changed files with 27 additions and 4 deletions
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12
clang/lib/CodeGen/TargetInfo.cpp
View File

@ -1275,9 +1275,17 @@ void X86_64ABIInfo::classify(QualType Ty, uint64_t OffsetBase,
uint64_t Offset = OffsetBase + Layout.getFieldOffset(idx);
bool BitField = i->isBitField();
// AMD64-ABI 3.2.3p2: Rule 1. If ..., or it contains unaligned
// fields, it has class MEMORY.
// AMD64-ABI 3.2.3p2: Rule 1. If the size of an object is larger than
// four eightbytes, or it contains unaligned fields, it has class MEMORY.
//
// The only case a 256-bit wide vector could be used is when the struct
// contains a single 256-bit element. Since Lo and Hi logic isn't extended
// to work for sizes wider than 128, early check and fallback to memory.
//
if (Size > 128 && getContext().getTypeSize(i->getType()) != 256) {
Lo = Memory;
return;
}
// Note, skip this test for bit-fields, see below.
if (!BitField && Offset % getContext().getTypeAlign(i->getType())) {
Lo = Memory;

4
clang/test/CodeGen/x86_64-arguments.c
View File

@ -280,7 +280,7 @@ void f39() { f38(x38); f37(x37); }
// The two next tests make sure that the struct below is passed
// in the same way regardless of avx being used
// TOBECHECKED: declare void @func40(%struct.t128* byval align 16)
// CHECK: declare void @func40(%struct.t128* byval align 16)
typedef float __m128 __attribute__ ((__vector_size__ (16)));
typedef struct t128 {
__m128 m;
@ -292,7 +292,7 @@ void func41(two128 s) {
func40(s);
}
// TOBECHECKED: declare void @func42(%struct.t128_2* byval align 16)
// CHECK: declare void @func42(%struct.t128_2* byval align 16)
typedef struct xxx {
__m128 array[2];
} Atwo128;

15
clang/test/CodeGenCXX/x86_64-arguments.cpp
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@ -134,3 +134,18 @@ namespace test7 {
// CHECK: define void @_ZN5test71zENS_1AES0_S0_S0_S0_NS_12StringDoubleE({{.*}} byval align 8)
// CHECK: define void @_ZN5test72zzENS_1AES0_S0_S0_NS_12StringDoubleE({{.*}} i8*
}
namespace test8 {
// CHECK: declare void @_ZN5test83fooENS_1BE(%"class.test8::B"* byval align 8)
class A {
char big[17];
};
class B : public A {};
void foo(B b);
void bar() {
B b;
foo(b);
}
}