attribute ((aligned)) should align to the minimum of BIGGEST_ALIGNMENT,
which is 4 bytes for -miamcu.
Tested on Linux/x86-64. OK for trunk?
Thanks.
H.J.
---
gcc/
PR target/66818
* config/i386/i386.h (ATTRIBUTE_ALIGNED_VALUE): Defined to 32
for IA MCU.
gcc/testsuite/
PR target/66818
* gcc.target/i386/pr66818.c: New test.
---
gcc/config/i386/i386.h | 2 +-
gcc/testsuite/gcc.target/i386/pr66818.c | 5 +++++
2 files changed, 6 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr66818.c
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index f357e79..74334ff 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -811,7 +811,7 @@ extern const char *host_detect_local_cpu (int argc, const
char **argv);
/* Alignment value for attribute ((aligned)). It is a constant since
it is the part of the ABI. We shouldn't change it with -mavx. */
-#define ATTRIBUTE_ALIGNED_VALUE 128
+#define ATTRIBUTE_ALIGNED_VALUE (TARGET_IAMCU ? 32 : 128)
/* Decide whether a variable of mode MODE should be 128 bit aligned. */
#define ALIGN_MODE_128(MODE) \
diff --git a/gcc/testsuite/gcc.target/i386/pr66818.c
b/gcc/testsuite/gcc.target/i386/pr66818.c
new file mode 100644
index 0000000..d90394c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66818.c
@@ -0,0 +1,5 @@
+/* { dg-do compile { target ia32 } } */
+/* { dg-options "-O2 -mno-sse -mno-mmx -miamcu" } */
+
+struct dummy { int x __attribute__((aligned)); };
+int array[__alignof__(struct dummy) == 4 ? 1 : -1];
--
2.4.3
