diff options
| author | Hans-Peter Nilsson <hp@axis.com> | 2020-01-28 00:59:41 +0100 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@axis.com> | 2020-05-09 03:48:52 +0200 |
| commit | 12bdaa7d3e94cf30f8ce1750325a245175bdbee5 (patch) | |
| tree | f943b7fe887870eb89d3e1bf05c5b06bf0072545 /gcc/config | |
| parent | e49cee5c8dce341f688741e5b093f6b5560c8090 (diff) | |
cris.md: Post-reload, split/generate clobberless zero source moves
A separated follow-up to the previous change: Also emit moves
from zero as not clobbering condition-codes.
(note: actually folded into the previous ChangeLog-entry)
gcc:
* config/cris/cris.md ("movsi"): For a zero-source post-reload,
generate a clobberless variant.
("*mov_fromzero<mode>_split"): New split.
("*mov_fromzero<mode>"): New insn.
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/cris/cris.md | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/gcc/config/cris/cris.md b/gcc/config/cris/cris.md index 3de2f5a136f..bf2cf966387 100644 --- a/gcc/config/cris/cris.md +++ b/gcc/config/cris/cris.md @@ -449,8 +449,9 @@ /* At post-reload time, we'll get here for e.g. split multi-mode insns with a memory destination. Go directly to the clobber-less variant. - FIXME: Also applies to zero source. */ - if (MEM_P (operands[0]) && reload_completed) + FIXME: Also applies to special-register source or destination. */ + if (reload_completed + && (MEM_P (operands[0]) || operands[1] == const0_rtx)) { emit_insn (gen_rtx_SET (operands[0], operands[1])); DONE; @@ -697,6 +698,20 @@ move %1,%0" [(set_attr "slottable" "yes,yes,yes,no,no,no") (set_attr "enabled" "<mov_tomem_enabled>")]) + +(define_split ;; "*mov_fromzero<mode>_split" + [(set (match_operand:BWD 0 "register_operand") (const_int 0)) + (clobber (reg:CC CRIS_CC0_REGNUM))] + "reload_completed + && REGNO(operands[0]) <= CRIS_LAST_GENERAL_REGISTER" + [(set (match_dup 0) (const_int 0))] + "") + +(define_insn "*mov_fromzero<mode>" + [(set (match_operand:BWD 0 "register_operand" "=r") (const_int 0))] + "reload_completed" + "clear<m> %0" + [(set_attr "slottable" "yes")]) ;; Movem patterns. Primarily for use in function prologue and epilogue. ;; Unfortunately, movem stores R0 in the highest memory location, thus |