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(simplify_set): Use rtx_equal_p to compare cc_use and its setter. 

(make_extraction): Don't put a subreg around a register if it is already in
the correct mode.

From-SVN: r7322
This commit is contained in:
Richard Kenner 1994-05-17 18:12:05 -04:00
parent 10670d47c6
commit c0d3ac4db6
1 changed files with 15 additions and 9 deletions
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10
gcc/combine.c
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@ -4210,7 +4210,7 @@ simplify_set (x)
&& (cc_use = find_single_use (dest, subst_insn, &other_insn)) != 0
&& (undobuf.other_insn == 0 || other_insn == undobuf.other_insn)
&& GET_RTX_CLASS (GET_CODE (*cc_use)) == '<'
&& XEXP (*cc_use, 0) == dest)
&& rtx_equal_p (XEXP (*cc_use, 0), dest))
{
enum rtx_code old_code = GET_CODE (*cc_use);
enum rtx_code new_code;
@ -5071,14 +5071,20 @@ make_extraction (mode, inner, pos, pos_rtx, len,
MEM_IN_STRUCT_P (new) = MEM_IN_STRUCT_P (inner);
}
else if (GET_CODE (inner) == REG)
{
/* We can't call gen_lowpart_for_combine here since we always want
a SUBREG and it would sometimes return a new hard register. */
if (tmode != inner_mode)
new = gen_rtx (SUBREG, tmode, inner,
(WORDS_BIG_ENDIAN
&& GET_MODE_SIZE (inner_mode) > UNITS_PER_WORD
? ((GET_MODE_SIZE (inner_mode) - GET_MODE_SIZE (tmode))
? ((GET_MODE_SIZE (inner_mode)
- GET_MODE_SIZE (tmode))
/ UNITS_PER_WORD)
: 0));
else
new = inner;
}
else
new = force_to_mode (inner, tmode,
len >= HOST_BITS_PER_WIDE_INT