optabs.c (prepare_cmp_insn): Use correct biasing for fixed-point comparison helpers.

	* optabs.c (prepare_cmp_insn): Use correct biasing for fixed-point
	comparison helpers.

From-SVN: r177015

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8bb0898dbc2a7011bda1cdfdfeda25fa8cfd3972..da6e982b712a1342bccd67331f528677afff0d57 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2011-08-01  Julian Brown  <julian@codesourcery.com>
+
+       * optabs.c (prepare_cmp_insn): Use correct biasing for fixed-point
+       comparison helpers.
+
 2011-07-31  Richard Henderson  <rth@redhat.com>
 
        * config/h8300/crti.asm: Add flags to .section directive.

diff --git a/gcc/optabs.c b/gcc/optabs.c
index 12717b67ab7b6d6fed3e1a3e91d901ccd9fe8914..99228f36d8f14058f7b9a65038a894de7e6924bc 100644 (file)
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -3959,11 +3959,13 @@ prepare_cmp_insn (rtx x, rtx y, enum rtx_code comparison, rtx size,
         result against 1 in the biased case, and zero in the unbiased
         case. For unsigned comparisons always compare against 1 after
         biasing the unbiased result by adding 1. This gives us a way to
-        represent LTU. */
+        represent LTU.
+        The comparisons in the fixed-point helper library are always
+        biased.  */
       x = result;
       y = const1_rtx;
 
-      if (!TARGET_LIB_INT_CMP_BIASED)
+      if (!TARGET_LIB_INT_CMP_BIASED && !ALL_FIXED_POINT_MODE_P (mode))
        {
          if (unsignedp)
            x = plus_constant (result, 1);