+2009-06-29 Daniel Jacobowitz <dan@codesourcery.com>
+
+ * config/arm/arm.h (REGISTER_MOVE_COST): Increase VFP register
+ move cost.
+
2009-06-29 Uros Bizjak <ubizjak@gmail.com>
* doc/extend.texi (Additional Floating Types): __float128 is also
/* If defined, gives a class of registers that cannot be used as the
operand of a SUBREG that changes the mode of the object illegally. */
-/* Moves between FPA_REGS and GENERAL_REGS are two memory insns. */
+/* Moves between FPA_REGS and GENERAL_REGS are two memory insns.
+ Moves between VFP_REGS and GENERAL_REGS are a single insn, but
+ it is typically more expensive than a single memory access. We set
+ the cost to less than two memory accesses so that floating
+ point to integer conversion does not go through memory. */
#define REGISTER_MOVE_COST(MODE, FROM, TO) \
(TARGET_32BIT ? \
((FROM) == FPA_REGS && (TO) != FPA_REGS ? 20 : \
(FROM) != FPA_REGS && (TO) == FPA_REGS ? 20 : \
- IS_VFP_CLASS (FROM) && !IS_VFP_CLASS (TO) ? 10 : \
- !IS_VFP_CLASS (FROM) && IS_VFP_CLASS (TO) ? 10 : \
+ IS_VFP_CLASS (FROM) && !IS_VFP_CLASS (TO) ? 15 : \
+ !IS_VFP_CLASS (FROM) && IS_VFP_CLASS (TO) ? 15 : \
(FROM) == IWMMXT_REGS && (TO) != IWMMXT_REGS ? 4 : \
(FROM) != IWMMXT_REGS && (TO) == IWMMXT_REGS ? 4 : \
(FROM) == IWMMXT_GR_REGS || (TO) == IWMMXT_GR_REGS ? 20 : \