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(simplify_rtx, case SUBREG): Fix direction of test when calling operand_subword... 

(simplify_rtx, case SUBREG): Fix direction of test when calling
operand_subword; use inline code intead of subreg_lowpart_p.

From-SVN: r13698
This commit is contained in:
Richard Kenner 1997-03-10 16:10:20 -05:00
parent a3a03040fb
commit 3c99d5ffb6
1 changed files with 11 additions and 3 deletions
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14
gcc/combine.c
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@ -3383,7 +3383,7 @@ simplify_rtx (x, op0_mode, last, in_dest)
if (CONSTANT_P (SUBREG_REG (x)) && op0_mode != VOIDmode
&& GET_MODE_SIZE (mode) == UNITS_PER_WORD
&& GET_MODE_SIZE (op0_mode) < UNITS_PER_WORD
&& GET_MODE_SIZE (op0_mode) > UNITS_PER_WORD
&& GET_MODE_CLASS (mode) == MODE_INT)
{
temp = operand_subword (SUBREG_REG (x), SUBREG_WORD (x),
@ -3395,8 +3395,16 @@ simplify_rtx (x, op0_mode, last, in_dest)
/* If we want a subreg of a constant, at offset 0,
take the low bits. On a little-endian machine, that's
always valid. On a big-endian machine, it's valid
only if the constant's mode fits in one word. */
if (CONSTANT_P (SUBREG_REG (x)) && subreg_lowpart_p (x)
only if the constant's mode fits in one word. Note that we
cannot use subreg_lowpart_p since we SUBREG_REG may be VOIDmode. */
if (CONSTANT_P (SUBREG_REG (x))
&& ((GET_MODE_SIZE (op0_mode) <= UNITS_PER_WORD
|| ! WORDS_BIG_ENDIAN)
? SUBREG_WORD (x) == 0
: (SUBREG_WORD (x)
== ((GET_MODE_SIZE (op0_mode)
- MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD))
/ UNITS_PER_WORD)))
&& GET_MODE_SIZE (mode) <= GET_MODE_SIZE (op0_mode)
&& (! WORDS_BIG_ENDIAN
|| GET_MODE_BITSIZE (op0_mode) <= BITS_PER_WORD))