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re PR middle-end/22067 (Inconsistent multiply by immediate) 

PR middle-end/22067
        * expmed.c (expand_mult): Substitute simple register for op0 when
        computing max_cost.

From-SVN: r104373
This commit is contained in:
David Edelsohn 2005-09-17 20:17:54 +00:00 committed by David Edelsohn
parent 31043f6cfc
commit 53c4ca47ae
2 changed files with 9 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-09-17 David Edelsohn <edelsohn@gnu.org>
PR middle-end/22067
* expmed.c (expand_mult): Substitute simple register for op0 when
computing max_cost.
2005-09-17 Richard Henderson <rth@redhat.com>
* expr.c (emit_move_via_integer): Add force argument, pass it on

5
gcc/expmed.c
View File

@ -3022,6 +3022,7 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
&& (unsignedp || !flag_trapv))
{
HOST_WIDE_INT coeff = 0;
rtx reg = gen_raw_REG (mode, LAST_VIRTUAL_REGISTER + 1);
/* synth_mult does an `unsigned int' multiply. As long as the mode is
less than or equal in size to `unsigned int' this doesn't matter.
@ -3040,7 +3041,7 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
{
/* Its safe to use -INTVAL (op1) even for INT_MIN, as the
result is interpreted as an unsigned coefficient. */
max_cost = rtx_cost (gen_rtx_MULT (mode, op0, op1), SET)
max_cost = rtx_cost (gen_rtx_MULT (mode, reg, op1), SET)
- neg_cost[mode];
if (max_cost > 0
&& choose_mult_variant (mode, -INTVAL (op1), &algorithm,
@ -3083,7 +3084,7 @@ expand_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target,
build_int_cst (NULL_TREE, floor_log2 (coeff)),
target, unsignedp);
max_cost = rtx_cost (gen_rtx_MULT (mode, op0, op1), SET);
max_cost = rtx_cost (gen_rtx_MULT (mode, reg, op1), SET);
if (choose_mult_variant (mode, coeff, &algorithm, &variant,
max_cost))
return expand_mult_const (mode, op0, coeff, target,