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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
--- gcc-4.3.2/gcc/config/arm/cirrus.md.old 2008-11-21 19:06:37.000000000 +0000
+++ gcc-4.3.2/gcc/config/arm/cirrus.md 2008-12-03 12:13:08.000000000 +0000
@@ -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\";
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