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loongarch: ignore zero-size fields in calling convention

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gcc/

	* config/loongarch/loongarch.cc
	(loongarch_flatten_aggregate_field): Ignore empty fields for
	RECORD_TYPE.

gcc/testsuite/

	* gcc.target/loongarch/zero-size-field-pass.c: New test.
	* gcc.target/loongarch/zero-size-field-ret.c: New test.
This commit is contained in:
Xi Ruoyao 2022-04-27 19:45:59 +08:00 committed by Lulu Cheng
parent ba949a6af4
commit d1ee29fd7f
3 changed files with 61 additions and 0 deletions
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3
gcc/config/loongarch/loongarch.cc
View File

@ -329,6 +329,9 @@ loongarch_flatten_aggregate_field (const_tree type,
if (!TYPE_P (TREE_TYPE (f)))
return -1;
if (DECL_SIZE (f) && integer_zerop (DECL_SIZE (f)))
continue;
HOST_WIDE_INT pos = offset + int_byte_position (f);
n = loongarch_flatten_aggregate_field (TREE_TYPE (f), fields, n,
pos);

30
gcc/testsuite/gcc.target/loongarch/zero-size-field-pass.c Normal file
View File

@ -0,0 +1,30 @@
/* Test that LoongArch backend ignores zero-sized fields of aggregates in
argument passing. */
/* { dg-do compile } */
/* { dg-options "-O2 -mdouble-float -mabi=lp64d" } */
/* { dg-final { scan-assembler "\\\$f1" } } */
struct test
{
int empty1[0];
double empty2[0];
int : 0;
float x;
long empty3[0];
long : 0;
float y;
unsigned : 0;
char empty4[0];
};
extern void callee (struct test);
void
caller (void)
{
struct test test;
test.x = 114;
test.y = 514;
callee (test);
}

28
gcc/testsuite/gcc.target/loongarch/zero-size-field-ret.c Normal file
View File

@ -0,0 +1,28 @@
/* Test that LoongArch backend ignores zero-sized fields of aggregates in
returning. */
/* { dg-do compile } */
/* { dg-options "-O2 -mdouble-float -mabi=lp64d" } */
/* { dg-final { scan-assembler-not "\\\$r4" } } */
struct test
{
int empty1[0];
double empty2[0];
int : 0;
float x;
long empty3[0];
long : 0;
float y;
unsigned : 0;
char empty4[0];
};
extern struct test callee (void);
float
caller (void)
{
struct test test = callee ();
return test.x + test.y;
}