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.
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);
--- /dev/null
+/* 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);
+}
--- /dev/null
+/* 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;
+}