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(subst): When moving operation inside IF_THEN_ELSE, make a new rtx

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instead of using SUBST due to sharing.

(simplify_comparison): Correct test for sign extension when trying to
widen comparison.

From-SVN: r1938
This commit is contained in:
Richard Kenner 1992-08-24 06:48:59 -04:00
parent c7d2d61d20
commit 5874448344
1 changed files with 19 additions and 18 deletions
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37
gcc/combine.c
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@ -2616,16 +2616,18 @@ subst (x, from, to, in_dest, unique_copy)
if ((GET_RTX_CLASS (code) == '2' || GET_RTX_CLASS (code) == 'c')
&& GET_CODE (XEXP (x, 0)) == IF_THEN_ELSE)
{
SUBST (XEXP (XEXP (x, 0), 1),
subst (gen_binary (code, mode, XEXP (XEXP (x, 0), 1),
XEXP (x, 1)),
pc_rtx, pc_rtx, 0));
SUBST (XEXP (XEXP (x, 0), 2),
subst (gen_binary (code, mode, XEXP (XEXP (x, 0), 2),
XEXP (x, 1)),
pc_rtx, pc_rtx, 0));
/* Don't do this by using SUBST inside X since we might be messing
up a shared expression. */
rtx cond = XEXP (XEXP (x, 0), 0);
rtx t_arm = subst (gen_binary (code, mode, XEXP (XEXP (x, 0), 1),
XEXP (x, 1)),
pc_rtx, pc_rtx, 0);
rtx f_arm = subst (gen_binary (code, mode, XEXP (XEXP (x, 0), 2),
XEXP (x, 1)),
pc_rtx, pc_rtx, 0);
x = XEXP (x, 0);
x = gen_rtx (IF_THEN_ELSE, mode, cond, t_arm, f_arm);
goto restart;
}
@ -2633,14 +2635,13 @@ subst (x, from, to, in_dest, unique_copy)
&& GET_CODE (XEXP (x, 0)) == IF_THEN_ELSE
&& GET_MODE (XEXP (x, 0)) == mode)
{
SUBST (XEXP (XEXP (x, 0), 1),
subst (gen_unary (code, mode, XEXP (XEXP (x, 0), 1)),
pc_rtx, pc_rtx, 0));
SUBST (XEXP (XEXP (x, 0), 2),
subst (gen_unary (code, mode, XEXP (XEXP (x, 0), 2)),
pc_rtx, pc_rtx, 0));
rtx cond = XEXP (XEXP (x, 0), 0);
rtx t_arm = subst (gen_unary (code, mode, XEXP (XEXP (x, 0), 1)),
pc_rtx, pc_rtx, 0);
rtx f_arm = subst (gen_unary (code, mode, XEXP (XEXP (x, 0), 2)),
pc_rtx, pc_rtx, 0);
x = XEXP (x, 0);
x = gen_rtx_combine (IF_THEN_ELSE, mode, cond, t_arm, f_arm);
goto restart;
}
@ -7956,9 +7957,9 @@ simplify_comparison (code, pop0, pop1)
|| ((code == EQ || code == NE
|| code == GE || code == GT || code == LE || code == LT)
&& (num_sign_bit_copies (op0, tmode)
>= GET_MODE_BITSIZE (tmode) - GET_MODE_BITSIZE (mode))
> GET_MODE_BITSIZE (tmode) - GET_MODE_BITSIZE (mode))
&& (num_sign_bit_copies (op1, tmode)
>= GET_MODE_BITSIZE (tmode) - GET_MODE_BITSIZE (mode))))
> GET_MODE_BITSIZE (tmode) - GET_MODE_BITSIZE (mode))))
{
op0 = gen_lowpart_for_combine (tmode, op0);
op1 = gen_lowpart_for_combine (tmode, op1);