diff options
| author | David E. O'Brien <obrien@FreeBSD.org> | 1998-08-14 09:20:23 +0000 |
|---|---|---|
| committer | David E. O'Brien <obrien@FreeBSD.org> | 1998-08-14 09:20:23 +0000 |
| commit | b756e894fa794bf80c3a42120b75f982d6d0ea6f (patch) | |
| tree | 09e10eec2bcbbbd86e1de27a1f0080d4494b77cd /lang/gcc28 | |
| parent | Upgrade to 2.1.0 (diff) | |
* expmed.c (expand_mult): Use 0 as add_target if should preserve
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>
Notes
Notes:
svn path=/head/; revision=12515
Diffstat (limited to 'lang/gcc28')
| -rw-r--r-- | lang/gcc28/files/patch-11 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/lang/gcc28/files/patch-11 b/lang/gcc28/files/patch-11 new file mode 100644 index 000000000000..dd0bbe0f7fa1 --- /dev/null +++ b/lang/gcc28/files/patch-11 @@ -0,0 +1,37 @@ +--- expmed.c.dist Sat Nov 8 14:11:58 1997 ++++ expmed.c Thu Aug 13 11:18:13 1998 +@@ -2249,7 +2249,8 @@ + rtx shift_subtarget = preserve ? 0 : accum; + rtx add_target + = (opno == alg.ops - 1 && target != 0 && variant != add_variant +- ? target : 0); ++ && ! preserve) ++ ? target : 0; + rtx accum_target = preserve ? 0 : accum; + + switch (alg.op[opno]) +@@ -2716,6 +2717,7 @@ + optab optab1, optab2; + int op1_is_constant, op1_is_pow2; + int max_cost, extra_cost; ++ static HOST_WIDE_INT last_div_const = 0; + + op1_is_constant = GET_CODE (op1) == CONST_INT; + op1_is_pow2 = (op1_is_constant +@@ -2825,8 +2827,15 @@ + size = GET_MODE_BITSIZE (mode); + #endif + ++ /* Only deduct something for a REM if the last divide done was ++ for a different constant. Then set the constant of the last ++ divide. */ + max_cost = div_cost[(int) compute_mode] +- - (rem_flag ? mul_cost[(int) compute_mode] + add_cost : 0); ++ - (rem_flag && ! (last_div_const != 0 && op1_is_constant ++ && INTVAL (op1) == last_div_const) ++ ? mul_cost[(int) compute_mode] + add_cost : 0); ++ ++ last_div_const = ! rem_flag && op1_is_constant ? INTVAL (op1) : 0; + + /* Now convert to the best mode to use. */ + if (compute_mode != mode) |