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rtlanal.c (subreg_regno_offset): Return correct offset for big endian paradoxical subregs. 

* rtlanal.c (subreg_regno_offset): Return correct offset for
	big endian paradoxical subregs.

From-SVN: r55650
This commit is contained in:
J"orn Rennecke 2002-07-22 14:29:28 +00:00 committed by Joern Rennecke
parent 0e902d98ae
commit eab2120d5e
2 changed files with 14 additions and 1 deletions
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5
gcc/ChangeLog
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@ -1,4 +1,7 @@
Mon Jul 22 15:21:41 2002 J"orn Rennecke <joern.rennecke@superh.com>
Mon Jul 22 15:27:25 2002 J"orn Rennecke <joern.rennecke@superh.com>
* rtlanal.c (subreg_regno_offset): Return correct offset for
big endian paradoxical subregs.
* optabs.c (expand_vector_unop): Don't expand using sub_optab
if we got the wrong mode.

10
gcc/rtlanal.c
View File

@ -3117,6 +3117,16 @@ subreg_regno_offset (xregno, xmode, offset, ymode)
nregs_xmode = HARD_REGNO_NREGS (xregno, xmode);
nregs_ymode = HARD_REGNO_NREGS (xregno, ymode);
/* If this is a big endian paradoxical subreg, which uses more actual
hard registers than the original register, we must return a negative
offset so that we find the proper highpart of the register. */
if (offset == 0
&& nregs_ymode > nregs_xmode
&& (GET_MODE_SIZE (ymode) > UNITS_PER_WORD
? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN))
return nregs_xmode - nregs_ymode;
if (offset == 0 || nregs_xmode == nregs_ymode)
return 0;