[PATCH] riscv: Cache the max alignment of output sections

[H.J. Lu]

Cache the max alignment of output sections instead of scanning all
output sections for each input section, which can take a very long
time if there are millions of input/output sections.

OK for master?

H.J.
---
	PR ld/22274
	* elfnn-riscv.c (riscv_elf_link_hash_table): Add max_alignment.
	(riscv_elf_link_hash_table_create): Initialize max_alignment to
	(bfd_vma) -1.
	(_bfd_riscv_relax_section): Cache the max alignment of output
	sections if possible.
---
 bfd/elfnn-riscv.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
index 59964ba163..d28cabded5 100644
--- a/bfd/elfnn-riscv.c
+++ b/bfd/elfnn-riscv.c
@@ -127,6 +127,9 @@ struct riscv_elf_link_hash_table
 
   /* Small local sym to section mapping cache.  */
   struct sym_cache sym_cache;
+
+  /* The max alignment of output sections.  */
+  bfd_vma max_alignment;
 };
 
 
@@ -274,6 +277,7 @@ riscv_elf_link_hash_table_create (bfd *abfd)
       return NULL;
     }
 
+  ret->max_alignment = (bfd_vma) -1;
   return &ret->elf.root;
 }
 
@@ -2976,7 +2980,17 @@ _bfd_riscv_relax_section (bfd *abfd, asection *sec,
 						 info->keep_memory)))
     goto fail;
 
-  max_alignment = _bfd_riscv_get_max_alignment (sec);
+  if (htab)
+    {
+      max_alignment = htab->max_alignment;
+      if (max_alignment == (bfd_vma) -1)
+	{
+	  max_alignment = _bfd_riscv_get_max_alignment (sec);
+	  htab->max_alignment = max_alignment;
+	}
+    }
+  else
+    max_alignment = _bfd_riscv_get_max_alignment (sec);
 
   /* Examine and consider relaxing each reloc.  */
   for (i = 0; i < sec->reloc_count; i++)
-- 
2.13.6