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arm.h (CANNOT_CHANGE_MODE_CLASS): Avoid subreg'ing VFP D registers in big-endian mode.

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* config/arm/arm.h (CANNOT_CHANGE_MODE_CLASS): Avoid subreg'ing
	VFP D registers in big-endian mode.

From-SVN: r192687
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Julian Brown 2012-10-22 11:32:37 +00:00 committed by Julian Brown
parent 09246494b3
commit e81bf2ce3b
2 changed files with 14 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2012-10-22 Julian Brown <julian@codesourcery.com>
* config/arm/arm.h (CANNOT_CHANGE_MODE_CLASS): Avoid subreg'ing
VFP D registers in big-endian mode.
2012-10-22 Georg-Johann Lay <avr@gjlay.de>
* doc/invoke.texi (AVR Options): Document __AVR_ARCH__.

11
gcc/config/arm/arm.h
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@ -1205,8 +1205,15 @@ enum reg_class
/* In VFPv1, VFP registers could only be accessed in the mode they
were set, so subregs would be invalid there. However, we don't
support VFPv1 at the moment, and the restriction was lifted in
VFPv2. */
#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) 0
VFPv2.
In big-endian mode, modes greater than word size (i.e. DFmode) are stored in
VFP registers in little-endian order. We can't describe that accurately to
GCC, so avoid taking subregs of such values. */
#define CANNOT_CHANGE_MODE_CLASS(FROM, TO, CLASS) \
(TARGET_VFP && TARGET_BIG_END \
&& (GET_MODE_SIZE (FROM) > UNITS_PER_WORD \
|| GET_MODE_SIZE (TO) > UNITS_PER_WORD) \
&& reg_classes_intersect_p (VFP_REGS, (CLASS)))
/* The class value for index registers, and the one for base regs. */
#define INDEX_REG_CLASS (TARGET_THUMB1 ? LO_REGS : GENERAL_REGS)