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emit-rtl.c (gen_lowpart): When requesting the low-part of a MEM... 

* emit-rtl.c (gen_lowpart): When requesting the low-part of a
	MEM, try loading the MEM into a register and taking the low-part
	of that, to help CSE see the use of the MEM in its true mode.

From-SVN: r63907
This commit is contained in:
Roger Sayle 2003-03-06 21:59:09 +00:00 committed by Roger Sayle
parent 0768112136
commit 37f5242b58
2 changed files with 12 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2003-03-06 Roger Sayle <roger@eyesopen.com>
* emit-rtl.c (gen_lowpart): When requesting the low-part of a
MEM, try loading the MEM into a register and taking the low-part
of that, to help CSE see the use of the MEM in its true mode.
2002-03-05 Tom Tromey <tromey@redhat.com>
* config/stormy16/stormy16.h (DWARF_LINE_MIN_INSTR_LENGTH):

6
gcc/emit-rtl.c
View File

@ -1371,6 +1371,12 @@ gen_lowpart (mode, x)
{
/* The only additional case we can do is MEM. */
int offset = 0;
/* The following exposes the use of "x" to CSE. */
if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD
&& ! no_new_pseudos)
return gen_lowpart (mode, force_reg (GET_MODE (x), x));
if (WORDS_BIG_ENDIAN)
offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
- MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));