gas: xtensa: limit size of auto litpools
Literal movement code may grow auto litpool so big that it won't be possible to jump around it. Limit the size of auto litpools by 1/2 of the jump range. gas/ 2018-02-20 Max Filippov <jcmvbkbc@gmail.com> * config/tc-xtensa.c (struct litpool_frag): Add new field literal_count. (MAX_AUTO_POOL_LITERALS, MAX_EXPLICIT_POOL_LITERALS) (MAX_POOL_LITERALS): New macro definitions. (auto_litpool_limit): Initialize to 0. (md_parse_option): Set auto_litpool_limit in the presence of --auto-litpools option. (xtensa_maybe_create_literal_pool_frag): Zero-initialize literal_count field. (xg_find_litpool): New function. Make sure that found literal pool size is within the limit. (xtensa_move_literals): Extract literal pool search code into the new function. * testsuite/gas/xtensa/all.exp: Add auto-litpools-2 test. * testsuite/gas/xtensa/auto-litpools-2.d: New file. * testsuite/gas/xtensa/auto-litpools-2.s: New file. * testsuite/gas/xtensa/auto-litpools.d: Fix up changed addresses. * testsuite/gas/xtensa/auto-litpools.s: Change literal value so that objdump doesn't get out of sync.
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@ -1,3 +1,26 @@
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2018-02-20 Max Filippov <jcmvbkbc@gmail.com>
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* config/tc-xtensa.c (struct litpool_frag): Add new field
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literal_count.
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(MAX_AUTO_POOL_LITERALS, MAX_EXPLICIT_POOL_LITERALS)
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(MAX_POOL_LITERALS): New macro definitions.
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(auto_litpool_limit): Initialize to 0.
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(md_parse_option): Set auto_litpool_limit in the presence of
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--auto-litpools option.
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(xtensa_maybe_create_literal_pool_frag): Zero-initialize
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literal_count field.
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(xg_find_litpool): New function. Make sure that found literal
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pool size is within the limit.
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(xtensa_move_literals): Extract literal pool search code into
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the new function.
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* testsuite/gas/xtensa/all.exp: Add auto-litpools-2 test.
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* testsuite/gas/xtensa/auto-litpools-2.d: New file.
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* testsuite/gas/xtensa/auto-litpools-2.s: New file.
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* testsuite/gas/xtensa/auto-litpools.d: Fix up changed
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addresses.
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* testsuite/gas/xtensa/auto-litpools.s: Change literal value so
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that objdump doesn't get out of sync.
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2018-02-20 Thomas Preud'homme <thomas.preudhomme@arm.com>
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* doc/c-arm.texi (.arch_extension): Mention extensions it accepts are
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@ -438,6 +438,7 @@ struct litpool_frag
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addressT addr;
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short priority; /* 1, 2, or 3 -- 1 is highest */
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short original_priority;
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int literal_count;
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};
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/* Map a segment to its litpool_frag list. */
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@ -451,6 +452,14 @@ struct litpool_seg
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static struct litpool_seg litpool_seg_list;
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/* Limit maximal size of auto litpool by half of the j range. */
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#define MAX_AUTO_POOL_LITERALS 16384
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/* Limit maximal size of explicit literal pool by l32r range. */
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#define MAX_EXPLICIT_POOL_LITERALS 65536
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#define MAX_POOL_LITERALS \
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(auto_litpools ? MAX_AUTO_POOL_LITERALS : MAX_EXPLICIT_POOL_LITERALS)
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/* Directive functions. */
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@ -488,7 +497,7 @@ static int init_trampoline_frag (fragS *);
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static fixS *xg_append_jump (fragS *fragP, symbolS *sym, offsetT offset);
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static void xtensa_maybe_create_literal_pool_frag (bfd_boolean, bfd_boolean);
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static bfd_boolean auto_litpools = FALSE;
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static int auto_litpool_limit = 10000;
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static int auto_litpool_limit = 0;
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/* Alignment Functions. */
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@ -984,6 +993,8 @@ md_parse_option (int c, const char *arg)
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case option_auto_litpools:
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auto_litpools = TRUE;
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use_literal_section = FALSE;
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if (auto_litpool_limit <= 0)
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auto_litpool_limit = MAX_AUTO_POOL_LITERALS / 2;
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return 1;
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case option_no_auto_litpools:
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@ -7912,6 +7923,7 @@ xtensa_maybe_create_literal_pool_frag (bfd_boolean create,
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lpf->fragP = fragP;
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lpf->priority = (needed) ? (only_if_needed) ? 3 : 2 : 1;
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lpf->original_priority = lpf->priority;
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lpf->literal_count = 0;
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lps->frag_count = 0;
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}
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@ -11188,6 +11200,66 @@ xg_promote_candidate_litpool (struct litpool_seg *lps,
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/* Rest is done in xtensa_relax_frag. */
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}
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static struct litpool_frag *xg_find_litpool (struct litpool_seg *lps,
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struct litpool_frag *lpf,
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addressT addr)
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{
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struct litpool_frag *lp = lpf->prev;
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gas_assert (lp->fragP);
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while (lp->fragP->fr_subtype == RELAX_LITERAL_POOL_CANDIDATE_BEGIN)
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{
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lp = lp->prev;
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if (lp->fragP == NULL)
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{
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/* End of list; have to bite the bullet.
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Take the nearest. */
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lp = lpf->prev;
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break;
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}
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/* Does it (conservatively) reach? */
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if (addr - lp->addr <= 128 * 1024)
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{
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if (lp->fragP->fr_subtype == RELAX_LITERAL_POOL_BEGIN &&
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lp->literal_count < MAX_POOL_LITERALS)
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{
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/* Found a good one. */
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break;
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}
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else if (lp->prev->fragP &&
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addr - lp->prev->addr > 128 * 1024 &&
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lp->prev->literal_count < MAX_POOL_LITERALS)
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{
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/* This is still a "candidate" but the next one
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will be too far away, so revert to the nearest
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one, convert it and add the jump around. */
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lp = lpf->prev;
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break;
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}
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}
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}
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if (lp->literal_count >= MAX_POOL_LITERALS)
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{
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lp = lpf->prev;
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while (lp && lp->fragP && lp->literal_count >= MAX_POOL_LITERALS)
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{
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lp = lp->prev;
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}
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gas_assert (lp);
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}
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gas_assert (lp && lp->fragP && lp->literal_count < MAX_POOL_LITERALS);
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++lp->literal_count;
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/* Convert candidate and add the jump around. */
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if (lp->fragP->fr_subtype == RELAX_LITERAL_POOL_CANDIDATE_BEGIN)
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xg_promote_candidate_litpool (lps, lp);
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return lp;
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}
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static void
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xtensa_move_literals (void)
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{
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@ -11245,49 +11317,12 @@ xtensa_move_literals (void)
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preferring non-"candidate" positions to avoid
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the jump-around. */
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fragS *litfrag = fragP->tc_frag_data.literal_frags[slot];
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struct litpool_frag *lp = lpf->prev;
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if (!lp->fragP)
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{
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break;
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}
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while (lp->fragP->fr_subtype ==
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RELAX_LITERAL_POOL_CANDIDATE_BEGIN)
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{
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lp = lp->prev;
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if (lp->fragP == NULL)
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{
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/* End of list; have to bite the bullet.
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Take the nearest. */
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lp = lpf->prev;
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break;
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}
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/* Does it (conservatively) reach? */
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if (addr - lp->addr <= 128 * 1024)
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{
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if (lp->fragP->fr_subtype == RELAX_LITERAL_POOL_BEGIN)
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{
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/* Found a good one. */
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break;
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}
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else if (lp->prev->fragP &&
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addr - lp->prev->addr > 128 * 1024)
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{
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/* This is still a "candidate" but the next one
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will be too far away, so revert to the nearest
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one, convert it and add the jump around. */
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lp = lpf->prev;
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break;
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}
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}
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}
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/* Convert candidate and add the jump around. */
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if (lp->fragP->fr_subtype ==
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RELAX_LITERAL_POOL_CANDIDATE_BEGIN)
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xg_promote_candidate_litpool (lps, lp);
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if (!litfrag->tc_frag_data.literal_frag)
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{
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struct litpool_frag *lp;
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lp = xg_find_litpool (lps, lpf, addr);
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/* Take earliest use of this literal to avoid
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forward refs. */
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litfrag->tc_frag_data.literal_frag = lp->fragP;
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@ -102,6 +102,7 @@ if [istarget xtensa*-*-*] then {
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run_list_test "trampoline-2"
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run_dump_test "first_frag_align"
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run_dump_test "auto-litpools"
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run_dump_test "auto-litpools-2"
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run_dump_test "auto-litpools-first1"
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run_dump_test "auto-litpools-first2"
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run_dump_test "loc"
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@ -0,0 +1,6 @@
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#as: --auto-litpools
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#objdump: -d
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#name: auto litpool size limitation
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.*: +file format .*xtensa.*
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#...
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@ -0,0 +1,9 @@
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.text
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.global _start
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_start:
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j 1f
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.rep 33000
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movi a2, 0xf03df03d
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.endr
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1:
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ret
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@ -6,7 +6,7 @@
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#...
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.*8:.*l32r.a2, 4 .*
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#...
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.*3e43b:.*j.3e444 .*
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.*3f029:.*j.3f030 .*
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#...
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.*40754:.*l32r.a2, 3e440 .*
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.*40752:.*l32r.a2, 3f02c .*
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#...
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@ -1,7 +1,7 @@
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.text
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.align 4
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.literal .L0, 0x12345
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.literal .L1, 0x12345
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.literal .L1, 0x78f078f0
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f:
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l32r a2, .L0
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