[Patch 2/2 PR78561] Recalculate constant pool size before emitting it

gcc/

	PR rtl-optimization/78561
	* varasm.c (recompute_pool_offsets): New.
	(output_constant_pool): Call it.

gcc/testsuite/

	PR rtl-optimization/78561
	* gcc.target/aarch64/pr78561.c: New.

From-SVN: r243183

1 files changed, 28 insertions, 0 deletions

diff --git a/gcc/varasm.c b/gcc/varasm.c
index f8af0c1..f3cd70a 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -3942,6 +3942,29 @@ output_constant_pool_1 (struct constant_descriptor_rtx *desc,
   return;
 }
 
+/* Recompute the offsets of entries in POOL, and the overall size of
+   POOL.  Do this after calling mark_constant_pool to ensure that we
+   are computing the offset values for the pool which we will actually
+   emit.  */
+
+static void
+recompute_pool_offsets (struct rtx_constant_pool *pool)
+{
+  struct constant_descriptor_rtx *desc;
+  pool->offset = 0;
+
+  for (desc = pool->first; desc ; desc = desc->next)
+    if (desc->mark)
+      {
+	  /* Recalculate offset.  */
+	unsigned int align = desc->align;
+	pool->offset += (align / BITS_PER_UNIT) - 1;
+	pool->offset &= ~ ((align / BITS_PER_UNIT) - 1);
+	desc->offset = pool->offset;
+	pool->offset += GET_MODE_SIZE (desc->mode);
+      }
+}
+
 /* Mark all constants that are referenced by SYMBOL_REFs in X.
    Emit referenced deferred strings.  */
 
@@ -4060,6 +4083,11 @@ output_constant_pool (const char *fnname ATTRIBUTE_UNUSED,
      case we do not need to output the constant.  */
   mark_constant_pool ();
 
+  /* Having marked the constant pool entries we'll actually emit, we
+     now need to rebuild the offset information, which may have become
+     stale.  */
+  recompute_pool_offsets (pool);
+
 #ifdef ASM_OUTPUT_POOL_PROLOGUE
   ASM_OUTPUT_POOL_PROLOGUE (asm_out_file, fnname, fndecl, pool->offset);
 #endif