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| author | Kyrylo Tkachov <kyrylo.tkachov@arm.com> | 2016-06-06 15:59:48 +0000 |
|---|---|---|
| committer | Kyrylo Tkachov <ktkachov@gcc.gnu.org> | 2016-06-06 15:59:48 +0000 |
| commit | 3295b529d2fa5affde11526f04248af8f62444ed (patch) | |
| tree | 91b52cae92e4c3bca4ffcd1182caa77e446b96ad /gcc | |
| parent | 5545a9071573a58e858860724cb47ed7a5ef440d (diff) | |
| download | gcc-3295b529d2fa5affde11526f04248af8f62444ed.zip gcc-3295b529d2fa5affde11526f04248af8f62444ed.tar.gz gcc-3295b529d2fa5affde11526f04248af8f62444ed.tar.bz2 | |
[1/3][ARM] Keep ctz expressions together until after reload
PR middle-end/37780
* config/arm/arm.md (ctzsi2): Convert to define_insn_and_split.
From-SVN: r237138
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/arm/arm.md | 25 |
2 files changed, 19 insertions, 11 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3bffb74..7d8e76b 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2016-06-06 Kyrylo Tkachov <kyrylo.tkachov@arm.com> + + PR middle-end/37780 + * config/arm/arm.md (ctzsi2): Convert to define_insn_and_split. + 2016-06-06 Bernd Edlinger <bernd.edlinger@hotmail.de> PR c/24414 diff --git a/gcc/config/arm/arm.md b/gcc/config/arm/arm.md index 451011d..04714a1 100644 --- a/gcc/config/arm/arm.md +++ b/gcc/config/arm/arm.md @@ -10822,19 +10822,22 @@ (set_attr "predicable_short_it" "no") (set_attr "type" "clz")]) -(define_expand "ctzsi2" - [(set (match_operand:SI 0 "s_register_operand" "") - (ctz:SI (match_operand:SI 1 "s_register_operand" "")))] +;; Keep this as a CTZ expression until after reload and then split +;; into RBIT + CLZ. Since RBIT is represented as an UNSPEC it is unlikely +;; to fold with any other expression. + +(define_insn_and_split "ctzsi2" + [(set (match_operand:SI 0 "s_register_operand" "=r") + (ctz:SI (match_operand:SI 1 "s_register_operand" "r")))] "TARGET_32BIT && arm_arch_thumb2" + "#" + "&& reload_completed" + [(const_int 0)] " - { - rtx tmp = gen_reg_rtx (SImode); - emit_insn (gen_rbitsi2 (tmp, operands[1])); - emit_insn (gen_clzsi2 (operands[0], tmp)); - } - DONE; - " -) + emit_insn (gen_rbitsi2 (operands[0], operands[1])); + emit_insn (gen_clzsi2 (operands[0], operands[0])); + DONE; +") ;; V5E instructions. |