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re PR target/56351 (ARM Big-Endian: storing local double to packed variable causes corruption) 

PR target/56351
	Backport from mainline
	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.

From-SVN: r196664
This commit is contained in:
Seth LaForge 2013-03-14 18:52:18 +00:00 committed by Eric Botcazou
parent a4c0821aa4
commit 10f38bada9
2 changed files with 20 additions and 4 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2013-03-14 Seth LaForge <sethml@google.com>
PR target/56351
Backport from mainline
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.
2013-03-08 Joey Ye <joey.ye@arm.com>
Backport from mainline

15
gcc/config/arm/arm.h
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@ -1126,11 +1126,18 @@ enum reg_class
/* FPA registers can't do subreg as all values are reformatted to internal
precision. In VFPv1, VFP registers could only be accessed in the mode
they were set, so subregs would be invalid there too. However, we don't
support VFPv1 at the moment, and the restriction was lifted in VFPv2. */
support VFPv1 at the moment, and the restriction was lifted in 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) \
(GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO) \
? reg_classes_intersect_p (FPA_REGS, (CLASS)) \
: 0)
(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)) \
: GET_MODE_SIZE (FROM) != GET_MODE_SIZE (TO) \
&& reg_classes_intersect_p (FPA_REGS, (CLASS)))
/* The class value for index registers, and the one for base regs. */
#define INDEX_REG_CLASS (TARGET_THUMB1 ? LO_REGS : GENERAL_REGS)