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| author | Bernd Schmidt <bernds@redhat.com> | 2016-04-26 12:57:50 +0000 |
|---|---|---|
| committer | Bernd Schmidt <bernds@gcc.gnu.org> | 2016-04-26 12:57:50 +0000 |
| commit | a84454dc451034e76d05f0b23ad2bffceb8cac05 (patch) | |
| tree | 5d44aa1e17872c627a63a5f97048ef2f74ef4e35 /gcc | |
| parent | 1d776c5f1b922f1416a87ef9f1210a279e44c3d1 (diff) | |
| download | gcc-a84454dc451034e76d05f0b23ad2bffceb8cac05.zip gcc-a84454dc451034e76d05f0b23ad2bffceb8cac05.tar.gz gcc-a84454dc451034e76d05f0b23ad2bffceb8cac05.tar.bz2 | |
i386: Add a variant peephole for lea rather than ops that clobber CC.
* config/i386/i386.md (operation on memory peephole): Duplicate an
existing peephole and adapt it to match lea rather than an operation
that clobbers CC.
From-SVN: r235443
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/i386/i386.md | 32 |
2 files changed, 36 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index f439345..5dc4c74 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,9 @@ 2016-04-26 Bernd Schmidt <bschmidt@redhat.com> + * config/i386/i386.md (operation on memory peephole): Duplicate an + existing peephole and adapt it to match lea rather than an operation + that clobbers CC. + PR rtl-optimization/57193 * opts.c (default_options_table): Add OPT_frename_registers at -O2 and above. diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index b1f8461..30764c9 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -18018,6 +18018,38 @@ operands[5], const0_rtx); }) +;; Likewise for instances where we have a lea pattern. +(define_peephole2 + [(set (match_operand:SWI 0 "register_operand") + (match_operand:SWI 1 "memory_operand")) + (set (match_operand:SWI 3 "register_operand") + (plus (match_dup 0) + (match_operand:SWI 2 "<nonmemory_operand>"))) + (set (match_dup 1) (match_dup 3)) + (set (reg FLAGS_REG) (compare (match_dup 3) (const_int 0)))] + "(TARGET_READ_MODIFY_WRITE || optimize_insn_for_size_p ()) + && peep2_reg_dead_p (4, operands[3]) + && (rtx_equal_p (operands[0], operands[3]) + || peep2_reg_dead_p (2, operands[0])) + && !reg_overlap_mentioned_p (operands[0], operands[1]) + && !reg_overlap_mentioned_p (operands[3], operands[1]) + && !reg_overlap_mentioned_p (operands[0], operands[2]) + && (<MODE>mode != QImode + || immediate_operand (operands[2], QImode) + || any_QIreg_operand (operands[2], QImode)) + && ix86_match_ccmode (peep2_next_insn (3), CCGOCmode)" + [(parallel [(set (match_dup 4) (match_dup 5)) + (set (match_dup 1) (plus:SWI (match_dup 1) + (match_dup 2)))])] +{ + operands[4] = SET_DEST (PATTERN (peep2_next_insn (3))); + operands[5] = gen_rtx_PLUS (<MODE>mode, + copy_rtx (operands[1]), + copy_rtx (operands[2])); + operands[5] = gen_rtx_COMPARE (GET_MODE (operands[4]), + operands[5], const0_rtx); +}) + (define_peephole2 [(parallel [(set (match_operand:SWI 0 "register_operand") (match_operator:SWI 2 "plusminuslogic_operator" |