b756e894fa
subexpressions.
* expmed.c (expand_divmod): Save last divison constant and
if rem is same as div, don't adjust rem cost.
Submitted by: Peter Jeremy <peter.jeremy@auss2.alcatel.com.au>
38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
--- expmed.c.dist Sat Nov 8 14:11:58 1997
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+++ expmed.c Thu Aug 13 11:18:13 1998
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@@ -2249,7 +2249,8 @@
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rtx shift_subtarget = preserve ? 0 : accum;
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rtx add_target
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= (opno == alg.ops - 1 && target != 0 && variant != add_variant
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- ? target : 0);
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+ && ! preserve)
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+ ? target : 0;
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rtx accum_target = preserve ? 0 : accum;
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switch (alg.op[opno])
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@@ -2716,6 +2717,7 @@
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optab optab1, optab2;
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int op1_is_constant, op1_is_pow2;
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int max_cost, extra_cost;
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+ static HOST_WIDE_INT last_div_const = 0;
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op1_is_constant = GET_CODE (op1) == CONST_INT;
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op1_is_pow2 = (op1_is_constant
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@@ -2825,8 +2827,15 @@
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size = GET_MODE_BITSIZE (mode);
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#endif
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+ /* Only deduct something for a REM if the last divide done was
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+ for a different constant. Then set the constant of the last
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+ divide. */
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max_cost = div_cost[(int) compute_mode]
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- - (rem_flag ? mul_cost[(int) compute_mode] + add_cost : 0);
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+ - (rem_flag && ! (last_div_const != 0 && op1_is_constant
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+ && INTVAL (op1) == last_div_const)
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+ ? mul_cost[(int) compute_mode] + add_cost : 0);
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+
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+ last_div_const = ! rem_flag && op1_is_constant ? INTVAL (op1) : 0;
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/* Now convert to the best mode to use. */
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if (compute_mode != mode)
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