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expmed.c (div_cost): Replace with...

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* expmed.c (div_cost): Replace with...
	(sdiv_cost, udiv_cost): New.
	(init_expmed): Initialize sdiv_cost and udiv_cost, not div_cost.
	Rename the div and mod fields, used to initialize sdiv_pow2_cheap
	and smod_pow2_cheap, to sdiv_32 and smod_32 to avoid confusion.
	(expand_divmod): Replace use of div_cost with either sdiv_cost
	or udiv_cost depending upon the signedness of the operation.

From-SVN: r107641
This commit is contained in:
Roger Sayle 2005-11-29 03:06:14 +00:00 committed by Roger Sayle
parent 0a6a4494e4
commit a28b2ac662
2 changed files with 44 additions and 25 deletions
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10
gcc/ChangeLog
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@ -1,3 +1,13 @@
2005-11-28 Roger Sayle <roger@eyesopen.com>
* expmed.c (div_cost): Replace with...
(sdiv_cost, udiv_cost): New.
(init_expmed): Initialize sdiv_cost and udiv_cost, not div_cost.
Rename the div and mod fields, used to initialize sdiv_pow2_cheap
and smod_pow2_cheap, to sdiv_32 and smod_32 to avoid confusion.
(expand_divmod): Replace use of div_cost with either sdiv_cost
or udiv_cost depending upon the signedness of the operation.
2005-11-28 Alexandre Oliva <aoliva@redhat.com>
PR libfortran/24991

59
gcc/expmed.c
View File

@ -103,7 +103,8 @@ static int shift_cost[NUM_MACHINE_MODES][MAX_BITS_PER_WORD];
static int shiftadd_cost[NUM_MACHINE_MODES][MAX_BITS_PER_WORD];
static int shiftsub_cost[NUM_MACHINE_MODES][MAX_BITS_PER_WORD];
static int mul_cost[NUM_MACHINE_MODES];
static int div_cost[NUM_MACHINE_MODES];
static int sdiv_cost[NUM_MACHINE_MODES];
static int udiv_cost[NUM_MACHINE_MODES];
static int mul_widen_cost[NUM_MACHINE_MODES];
static int mul_highpart_cost[NUM_MACHINE_MODES];
@ -115,11 +116,12 @@ init_expmed (void)
struct rtx_def reg; rtunion reg_fld[2];
struct rtx_def plus; rtunion plus_fld1;
struct rtx_def neg;
struct rtx_def udiv; rtunion udiv_fld1;
struct rtx_def mult; rtunion mult_fld1;
struct rtx_def div; rtunion div_fld1;
struct rtx_def mod; rtunion mod_fld1;
struct rtx_def sdiv; rtunion sdiv_fld1;
struct rtx_def udiv; rtunion udiv_fld1;
struct rtx_def zext;
struct rtx_def sdiv_32; rtunion sdiv_32_fld1;
struct rtx_def smod_32; rtunion smod_32_fld1;
struct rtx_def wide_mult; rtunion wide_mult_fld1;
struct rtx_def wide_lshr; rtunion wide_lshr_fld1;
struct rtx_def wide_trunc;
@ -155,21 +157,25 @@ init_expmed (void)
PUT_CODE (&all.neg, NEG);
XEXP (&all.neg, 0) = &all.reg;
PUT_CODE (&all.udiv, UDIV);
XEXP (&all.udiv, 0) = &all.reg;
XEXP (&all.udiv, 1) = &all.reg;
PUT_CODE (&all.mult, MULT);
XEXP (&all.mult, 0) = &all.reg;
XEXP (&all.mult, 1) = &all.reg;
PUT_CODE (&all.div, DIV);
XEXP (&all.div, 0) = &all.reg;
XEXP (&all.div, 1) = 32 < MAX_BITS_PER_WORD ? cint[32] : GEN_INT (32);
PUT_CODE (&all.sdiv, DIV);
XEXP (&all.sdiv, 0) = &all.reg;
XEXP (&all.sdiv, 1) = &all.reg;
PUT_CODE (&all.mod, MOD);
XEXP (&all.mod, 0) = &all.reg;
XEXP (&all.mod, 1) = XEXP (&all.div, 1);
PUT_CODE (&all.udiv, UDIV);
XEXP (&all.udiv, 0) = &all.reg;
XEXP (&all.udiv, 1) = &all.reg;
PUT_CODE (&all.sdiv_32, DIV);
XEXP (&all.sdiv_32, 0) = &all.reg;
XEXP (&all.sdiv_32, 1) = 32 < MAX_BITS_PER_WORD ? cint[32] : GEN_INT (32);
PUT_CODE (&all.smod_32, MOD);
XEXP (&all.smod_32, 0) = &all.reg;
XEXP (&all.smod_32, 1) = XEXP (&all.sdiv_32, 1);
PUT_CODE (&all.zext, ZERO_EXTEND);
XEXP (&all.zext, 0) = &all.reg;
@ -205,10 +211,11 @@ init_expmed (void)
PUT_MODE (&all.reg, mode);
PUT_MODE (&all.plus, mode);
PUT_MODE (&all.neg, mode);
PUT_MODE (&all.udiv, mode);
PUT_MODE (&all.mult, mode);
PUT_MODE (&all.div, mode);
PUT_MODE (&all.mod, mode);
PUT_MODE (&all.sdiv, mode);
PUT_MODE (&all.udiv, mode);
PUT_MODE (&all.sdiv_32, mode);
PUT_MODE (&all.smod_32, mode);
PUT_MODE (&all.wide_trunc, mode);
PUT_MODE (&all.shift, mode);
PUT_MODE (&all.shift_mult, mode);
@ -217,11 +224,14 @@ init_expmed (void)
add_cost[mode] = rtx_cost (&all.plus, SET);
neg_cost[mode] = rtx_cost (&all.neg, SET);
div_cost[mode] = rtx_cost (&all.udiv, SET);
mul_cost[mode] = rtx_cost (&all.mult, SET);
sdiv_cost[mode] = rtx_cost (&all.sdiv, SET);
udiv_cost[mode] = rtx_cost (&all.udiv, SET);
sdiv_pow2_cheap[mode] = (rtx_cost (&all.div, SET) <= 2 * add_cost[mode]);
smod_pow2_cheap[mode] = (rtx_cost (&all.mod, SET) <= 4 * add_cost[mode]);
sdiv_pow2_cheap[mode] = (rtx_cost (&all.sdiv_32, SET)
<= 2 * add_cost[mode]);
smod_pow2_cheap[mode] = (rtx_cost (&all.smod_32, SET)
<= 4 * add_cost[mode]);
wider_mode = GET_MODE_WIDER_MODE (mode);
if (wider_mode != VOIDmode)
@ -3911,11 +3921,10 @@ expand_divmod (int rem_flag, enum tree_code code, enum machine_mode mode,
/* 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[compute_mode]
- (rem_flag && ! (last_div_const != 0 && op1_is_constant
&& INTVAL (op1) == last_div_const)
? mul_cost[compute_mode] + add_cost[compute_mode]
: 0);
max_cost = unsignedp ? udiv_cost[compute_mode] : sdiv_cost[compute_mode];
if (rem_flag && ! (last_div_const != 0 && op1_is_constant
&& INTVAL (op1) == last_div_const))
max_cost -= mul_cost[compute_mode] + add_cost[compute_mode];
last_div_const = ! rem_flag && op1_is_constant ? INTVAL (op1) : 0;