FreeChainXenon/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Permit doloop treatment for preconditioned loops.

Browse source 
From-SVN: r57902
This commit is contained in:
Dale Johannesen 2002-10-07 17:55:46 +00:00 • committed by Dale Johannesen
parent 0c59cbfaf6
commit dad482e6ee
5 changed files with 13 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
gcc/ChangeLog
View file

@ -1,3 +1,9 @@
2002-10-07 Dale Johannesen <dalej@apple.com>
* rtl.h: Add NOTE_PRECONDITIONED.
* unroll.c: Set it.
* loop.c: Set loop_info->preconditioned from it.
* doloop.c: Permit doloop treatment when loop_info->preconditoned.
2002-10-07 Richard Henderson <rth@redhat.com> 2002-10-07 Richard Henderson <rth@redhat.com>
* config/i960/i960.c (i960_setup_incoming_varargs): Create a * config/i960/i960.c (i960_setup_incoming_varargs): Create a

1
gcc/doloop.c
View file

@ -339,6 +339,7 @@ doloop_valid_p (loop, jump_insn)
condition at run-time and have an additional jump around the loop condition at run-time and have an additional jump around the loop
to ensure an infinite loop. */ to ensure an infinite loop. */
if (loop_info->comparison_code == NE if (loop_info->comparison_code == NE
&& !loop_info->preconditioned
&& INTVAL (loop_info->increment) != -1 && INTVAL (loop_info->increment) != -1
&& INTVAL (loop_info->increment) != 1) && INTVAL (loop_info->increment) != 1)
{ {

3
gcc/loop.c
View file

@ -2475,7 +2475,8 @@ prescan_loop (loop)
loop_info->first_loop_store_insn = NULL_RTX; loop_info->first_loop_store_insn = NULL_RTX;
loop_info->mems_idx = 0; loop_info->mems_idx = 0;
loop_info->num_mem_sets = 0; loop_info->num_mem_sets = 0;
/* If loop opts run twice, this was set on 1st pass for 2nd. */
loop_info->preconditioned = NOTE_PRECONDITIONED (end);
for (insn = start; insn && GET_CODE (insn) != CODE_LABEL; for (insn = start; insn && GET_CODE (insn) != CODE_LABEL;
insn = PREV_INSN (insn)) insn = PREV_INSN (insn))

1
gcc/rtl.h
View file

@ -787,6 +787,7 @@ extern const char * const reg_note_name[];
#define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE) #define NOTE_BASIC_BLOCK(INSN) XCBBDEF (INSN, 4, NOTE)
#define NOTE_EXPECTED_VALUE(INSN) XCEXP (INSN, 4, NOTE) #define NOTE_EXPECTED_VALUE(INSN) XCEXP (INSN, 4, NOTE)
#define NOTE_PREDICTION(INSN) XCINT (INSN, 4, NOTE) #define NOTE_PREDICTION(INSN) XCINT (INSN, 4, NOTE)
#define NOTE_PRECONDITIONED(INSN) XCINT (INSN, 4, NOTE)
/* In a NOTE that is a line number, this is the line number. /* In a NOTE that is a line number, this is the line number.
Other kinds of NOTEs are identified by negative numbers here. */ Other kinds of NOTEs are identified by negative numbers here. */

3
gcc/unroll.c
View file

@ -1136,6 +1136,9 @@ unroll_loop (loop, insn_count, strength_reduce_p)
/* And whether the loop has been preconditioned. */ /* And whether the loop has been preconditioned. */
loop_info->preconditioned = loop_preconditioned; loop_info->preconditioned = loop_preconditioned;
/* Remember whether it was preconditioned for the second loop pass. */
NOTE_PRECONDITIONED (loop->end) = loop_preconditioned;
/* For each biv and giv, determine whether it can be safely split into /* For each biv and giv, determine whether it can be safely split into
a different variable for each unrolled copy of the loop body. a different variable for each unrolled copy of the loop body.
We precalculate and save this info here, since computing it is We precalculate and save this info here, since computing it is