diff options
| author | Ray Essick <essick@ddna.labs.mot.com> | 2000-08-18 21:11:23 +0000 |
|---|---|---|
| committer | Nick Clifton <nickc@gcc.gnu.org> | 2000-08-18 21:11:23 +0000 |
| commit | 477d303f84bcf6da0c51c2aea9fbe213d04803d1 (patch) | |
| tree | 25614ba13be37ceb968c37226e5bcc8833028044 | |
| parent | 7d2950e52384ed32ca712f28460645d8ca35c97f (diff) | |
| download | gcc-477d303f84bcf6da0c51c2aea9fbe213d04803d1.zip gcc-477d303f84bcf6da0c51c2aea9fbe213d04803d1.tar.gz gcc-477d303f84bcf6da0c51c2aea9fbe213d04803d1.tar.bz2 | |
Only allow allow rotations by a constant amount.
Do not generate ROTL instruction.
From-SVN: r35797
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/mcore/mcore.md | 26 |
2 files changed, 23 insertions, 8 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 2b97062..53183a0 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2000-08-18 Ray Essick <essick@ddna.labs.mot.com> & Nick Clifton <nickc@redhat.com> + + * config/mcore/mcore.md (rotlsi3): Allow allow rotations by a + constant amount. Do not generate ROTL instruction. + Fri Aug 18 16:22:20 2000 Alexandre Oliva <aoliva@redhat.com> * config/sh/elf.h: Do not include sh/sh.h. diff --git a/gcc/config/mcore/mcore.md b/gcc/config/mcore/mcore.md index 6c64561..fa659a3 100644 --- a/gcc/config/mcore/mcore.md +++ b/gcc/config/mcore/mcore.md @@ -505,15 +505,25 @@ ;; Shifts and rotates ;; ------------------------------------------------------------------------- -;;; ??? The reg case may never match. -(define_insn "rotlsi3" - [(set (match_operand:SI 0 "mcore_arith_reg_operand" "=r,r") - (rotate:SI (match_operand:SI 1 "mcore_arith_reg_operand" "0,0") - (match_operand:SI 2 "mcore_arith_K_operand_not_0" "r,K")))] +;; Only allow these if the shift count is a convenient constant. +(define_expand "rotlsi3" + [(set (match_operand:SI 0 "mcore_arith_reg_operand" "") + (rotate:SI (match_operand:SI 1 "mcore_arith_reg_operand" "") + (match_operand:SI 2 "nonmemory_operand" "")))] + "" + "if (! mcore_literal_K_operand (operands[2], SImode)) + FAIL; + ") + +;; We can only do constant rotates, which is what this pattern provides. +;; The combiner will put it together for us when we do: +;; (x << N) | (x >> (32 - N)) +(define_insn "" + [(set (match_operand:SI 0 "mcore_arith_reg_operand" "=r") + (rotate:SI (match_operand:SI 1 "mcore_arith_reg_operand" "0") + (match_operand:SI 2 "mcore_literal_K_operand" "K")))] "" - "@ - rotl %0,%2 - rotli %0,%2" + "rotli %0,%2" [(set_attr "type" "shift")]) (define_insn "ashlsi3" |