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emit-rtl.c (gen_highpart): The high part of a CONST_INT is not zero if...

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* emit-rtl.c (gen_highpart): The high part of a CONST_INT is not zero
	if HOST_BITS_PER_WIDE_INT is larger than BITS_PER_WORD.
	* final.c (split_double): Sign extend both halves of a split CONST_INT.

From-SVN: r19375
This commit is contained in:
John Carr 1998-04-22 12:57:04 +00:00 committed by John Carr
parent 3f4ea1dee8
commit 27eef9cece
3 changed files with 19 additions and 13 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
Wed Apr 22 15:52:22 1998 John Carr <jfc@mit.edu>
* emit-rtl.c (gen_highpart): The high part of a CONST_INT is not zero
if HOST_BITS_PER_WIDE_INT is larger than BITS_PER_WORD.
* final.c (split_double): Sign extend both halves of a split CONST_INT.
Wed Apr 22 10:42:45 1998 Jeffrey A Law (law@cygnus.com)
* mips.c (compute_frame_size): Change only argument to a HOST_WIDE_INT.

13
gcc/emit-rtl.c
View File

@ -720,14 +720,13 @@ gen_lowpart_common (mode, x)
: GEN_INT (CONST_DOUBLE_LOW (x)));
else
{
/* MODE must be narrower than HOST_BITS_PER_INT. */
/* MODE must be narrower than HOST_BITS_PER_WIDE_INT. */
int width = GET_MODE_BITSIZE (mode);
HOST_WIDE_INT val = (GET_CODE (x) == CONST_INT ? INTVAL (x)
: CONST_DOUBLE_LOW (x));
if (((val & ((HOST_WIDE_INT) (-1) << (width - 1)))
!= ((HOST_WIDE_INT) (-1) << (width - 1))))
val &= ((HOST_WIDE_INT) 1 << width) - 1;
/* Sign extend to HOST_WIDE_INT. */
val = val << (HOST_BITS_PER_WIDE_INT - width) >> (HOST_BITS_PER_WIDE_INT - width);
return (GET_CODE (x) == CONST_INT && INTVAL (x) == val ? x
: GEN_INT (val));
@ -984,7 +983,11 @@ gen_highpart (mode, x)
)
return GEN_INT (CONST_DOUBLE_HIGH (x) & GET_MODE_MASK (mode));
else if (GET_CODE (x) == CONST_INT)
return const0_rtx;
{
if (HOST_BITS_PER_WIDE_INT <= BITS_PER_WORD)
return const0_rtx;
return GEN_INT (INTVAL (x) >> (HOST_BITS_PER_WIDE_INT - BITS_PER_WORD));
}
else if (GET_CODE (x) == MEM)
{
register int offset = 0;

12
gcc/final.c
View File

@ -3677,16 +3677,12 @@ split_double (value, first, second)
if (HOST_BITS_PER_WIDE_INT >= (2 * BITS_PER_WORD))
{
/* In this case the CONST_INT holds both target words.
Extract the bits from it into two word-sized pieces. */
Extract the bits from it into two word-sized pieces.
Sign extend each half to HOST_WIDE_INT. */
rtx low, high;
HOST_WIDE_INT word_mask;
/* Avoid warnings for shift count >= BITS_PER_WORD. */
int shift_count = BITS_PER_WORD - 1;
word_mask = (HOST_WIDE_INT) 1 << shift_count;
word_mask |= word_mask - 1;
low = GEN_INT (INTVAL (value) & word_mask);
high = GEN_INT ((INTVAL (value) >> (shift_count + 1)) & word_mask);
low = GEN_INT (INTVAL (value) << (HOST_BITS_PER_WIDE_INT - BITS_PER_WORD) >> (HOST_BITS_PER_WIDE_INT - BITS_PER_WORD));
high = GEN_INT (INTVAL (value) << (HOST_BITS_PER_WIDE_INT - 2 * BITS_PER_WORD) >> (HOST_BITS_PER_WIDE_INT - BITS_PER_WORD));
if (WORDS_BIG_ENDIAN)
{
*first = high;