Tighten ARM's CANNOT_CHANGE_MODE_CLASS

[Richard Sandiford]

Richard Earnshaw <rearnsha@arm.com> writes:
> On Thu, 2011-03-24 at 15:40 +0000, Richard Sandiford wrote:
>> gcc/
>> 	* config/arm/arm.h (CANNOT_CHANGE_MODE_CLASS): Restrict FPA_REGS
>> 	case to VFPv1.
>> 
>
> GCC doesn't support VFPv1 (see the all_fpus table), and I don't think
> many chips based on that ever escaped into the wild world, so I'm not
> worried about trying to add that now.
>
> So it's probably safe to just kill that check for VFP entirely.

Even better. :-)  How does this look?  Tested on arm-linux-gnueabi,
no regressions.

Richard


gcc/
	* config/arm/arm.h (CANNOT_CHANGE_MODE_CLASS): Restrict FPA_REGS
	case to VFPv1.

Index: gcc/config/arm/arm.h
===================================================================
--- gcc/config/arm/arm.h	2011-03-24 17:21:52.000000000 +0000
+++ gcc/config/arm/arm.h	2011-03-24 18:39:09.000000000 +0000
@@ -1167,12 +1167,10 @@ #define IRA_COVER_CLASSES						     \
 }
 
 /* FPA registers can't do subreg as all values are reformatted to internal
-   precision.  VFP registers may only be accessed in the mode they
-   were set.  */
-#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS)	\
-  (GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO)		\
-   ? reg_classes_intersect_p (FPA_REGS, (CLASS))	\
-     || reg_classes_intersect_p (VFP_REGS, (CLASS))	\
+   precision.  */
+#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS)		\
+  (GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO)			\
+   ? reg_classes_intersect_p (FPA_REGS, (CLASS))		\
    : 0)
 
 /* The class value for index registers, and the one for base regs.  */