real.c (real_hash): New.

        * real.c (real_hash): New.
        * real.h: Declare it.
        * cse.c (canon_hash): Use it.
        * cselib.c (hash_rtx): Likewise.
        * emit-rtl.c (const_double_htab_hash): Likewise.
        * rtl.h (CONST_DOUBLE_REAL_VALUE): New.
        * varasm.c (struct rtx_const): Reduce vector size; separate
        integer and fp vectors.
        (HASHBITS): Remove.
        (const_hash_1): Rename from const_hash.  Use real_hash.  Do not
        take modulus MAX_HASH_TABLE.
        (const_hash): New.  Do take modulus MAX_HASH_TABLE.
        (output_constant_def): Do not take modulus MAX_HASH_TABLE.
        (SYMHASH): Don't use HASHBITS.
        (decode_rtx_const): Copy only active bits from REAL_VALUE_TYPE.
        Fix CONST_VECTOR thinko wrt fp vectors.  Fix kind comparison.
        (simplify_subtraction): Fix kind comparison.
        (const_hash_rtx): Return unsigned int.  Don't use HASHBITS.
        Use a union to pun integer array.
        * config/rs6000/rs6000.c (rs6000_hash_constant): Use real_hash;
        only hash two words of integral CONST_DOUBLE.

From-SVN: r57356

1 files changed, 5 insertions, 4 deletions

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index 4a8b9e3..bfcc289 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -221,12 +221,13 @@ static hashval_t
 const_double_htab_hash (x)
      const void *x;
 {
-  hashval_t h = 0;
-  size_t i;
   rtx value = (rtx) x;
+  hashval_t h;
 
-  for (i = 0; i < sizeof(CONST_DOUBLE_FORMAT)-1; i++)
-    h ^= XWINT (value, i);
+  if (GET_MODE (value) == VOIDmode)
+    h = CONST_DOUBLE_LOW (value) ^ CONST_DOUBLE_HIGH (value);
+  else
+    h = real_hash (CONST_DOUBLE_REAL_VALUE (value));
   return h;
 }