cfcpys and cfcpyd have hardware bugs which mean they truncate denormalized
values to zero and convert minus zero to plus zero.

A 64-bit shift with a shift count of 0 copies them bitwise.

    Martin Guy <martinwguy@yahoo.it>, December 2008

Index: gcc-4.2.4/gcc/config/arm/cirrus.md
===================================================================
--- gcc-4.2.4.orig/gcc/config/arm/cirrus.md	2009-08-09 15:43:46.000000000 +0100
+++ gcc-4.2.4/gcc/config/arm/cirrus.md	2009-08-09 15:45:03.000000000 +0100
@@ -485,7 +485,7 @@
    && (GET_CODE (operands[0]) != MEM
        || register_operand (operands[1], SFmode))"
   "@
-   cfcpys%?\\t%V0, %V1
+   cfsh64%?\\t%Z0, %Z1, #0\\t%@ float
    cfldrs%?\\t%V0, %1
    cfmvsr%?\\t%V0, %1
    cfmvrs%?\\t%0, %V1
@@ -514,7 +514,7 @@
     case 1: return \"stm%?ia\\t%m0, %M1\\t%@ double\";
     case 2: return \"#\";
     case 3: case 4: return output_move_double (operands);
-    case 5: return \"cfcpyd%?\\t%V0, %V1\";
+    case 5: return \"cfsh64%?\\t%Z0, %Z1, #0\\t%@ double\";
     case 6: return \"cfldrd%?\\t%V0, %1\";
     case 7: return \"cfmvdlr\\t%V0, %Q1\;cfmvdhr%?\\t%V0, %R1\";
     case 8: return \"cfmvrdl%?\\t%Q0, %V1\;cfmvrdh%?\\t%R0, %V1\";