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(convert_move): Truncate via word_mode only if to_mode fits in one word.

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Truncate by referring in TO_MODE for any FROM, but force_reg if nec.

From-SVN: r3553
This commit is contained in:
Richard Stallman 1993-02-27 19:04:24 +00:00
parent 0df69870f1
commit d3c64ee3f3
1 changed files with 12 additions and 9 deletions
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21
gcc/expr.c
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@ -833,7 +833,9 @@ convert_move (to, from, unsignedp)
return;
}
if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD)
/* Truncating multi-word to a word or less. */
if (GET_MODE_BITSIZE (from_mode) > BITS_PER_WORD
&& GET_MODE_BITSIZE (to_mode) <= BITS_PER_WORD)
{
convert_move (to, gen_lowpart (word_mode, from), 0);
return;
@ -881,19 +883,20 @@ convert_move (to, from, unsignedp)
/* For truncation, usually we can just refer to FROM in a narrower mode. */
if (GET_MODE_BITSIZE (to_mode) < GET_MODE_BITSIZE (from_mode)
&& TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (to_mode),
GET_MODE_BITSIZE (from_mode))
&& ((GET_CODE (from) == MEM
&& ! MEM_VOLATILE_P (from)
&& direct_load[(int) to_mode]
&& ! mode_dependent_address_p (XEXP (from, 0)))
|| GET_CODE (from) == REG
|| GET_CODE (from) == SUBREG))
GET_MODE_BITSIZE (from_mode)))
{
if (!((GET_CODE (from) == MEM
&& ! MEM_VOLATILE_P (from)
&& direct_load[(int) to_mode]
&& ! mode_dependent_address_p (XEXP (from, 0)))
|| GET_CODE (from) == REG
|| GET_CODE (from) == SUBREG))
from = force_reg (from_mode, from);
emit_move_insn (to, gen_lowpart (to_mode, from));
return;
}
/* For truncation, usually we can just refer to FROM in a narrower mode. */
/* Handle extension. */
if (GET_MODE_BITSIZE (to_mode) > GET_MODE_BITSIZE (from_mode))
{
/* Convert directly if that works. */