[PATCH v2 9/9] aarch64: Handle alignment when it is bigger than BIGGEST_ALIGNMENT

[Evgeny Karpov]

In some cases, the alignment can be bigger than BIGGEST_ALIGNMENT.

The issue was detected while building FFmpeg.
It creates structures, most likely for AVX optimization.

For instance:
float __attribute__((aligned (32))) large_aligned_array[3];

BIGGEST_ALIGNMENT could be up to 512 bits on x64.
This patch has been added to cover this case without needing to
change the FFmpeg code.

gcc/ChangeLog:

        * config/aarch64/aarch64-coff.h (ASM_OUTPUT_ALIGNED_LOCAL):
        Change alignment.
---
 gcc/config/aarch64/aarch64-coff.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gcc/config/aarch64/aarch64-coff.h 
b/gcc/config/aarch64/aarch64-coff.h
index 17f346fe540..bf8e30b9c08 100644
--- a/gcc/config/aarch64/aarch64-coff.h
+++ b/gcc/config/aarch64/aarch64-coff.h
@@ -58,6 +58,16 @@
   assemble_name ((FILE), (NAME)),              \
   fprintf ((FILE), ",%lu\n", (ROUNDED)))
 
+#define ASM_OUTPUT_ALIGNED_LOCAL(FILE, NAME, SIZE, ALIGNMENT)  \
+  { \
+    unsigned HOST_WIDE_INT rounded = MAX ((SIZE), 1); \
+    unsigned HOST_WIDE_INT alignment = MAX ((ALIGNMENT), BIGGEST_ALIGNMENT); \
+    rounded += (alignment / BITS_PER_UNIT) - 1; \
+    rounded = (rounded / (alignment / BITS_PER_UNIT) \
+      * (alignment / BITS_PER_UNIT)); \
+    ASM_OUTPUT_LOCAL (FILE, NAME, SIZE, rounded); \
+  }
+
 #define ASM_OUTPUT_SKIP(STREAM, NBYTES)        \
   fprintf (STREAM, "\t.space\t%d  // skip\n", (int) (NBYTES))
 
-- 
2.34.1