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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 1996-10-23 18:16:59 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 1996-10-23 18:16:59 +0000 |
| commit | bbae0daaaa1a1d0a17cdf4262d47b26538cc9ac1 (patch) | |
| tree | 0e96ec5ba6106ee270356661df26d52921a39230 | |
| parent | 7cabe29ab965599dc81332031b95dbaeab285b73 (diff) | |
| download | gcc-bbae0daaaa1a1d0a17cdf4262d47b26538cc9ac1.zip gcc-bbae0daaaa1a1d0a17cdf4262d47b26538cc9ac1.tar.gz gcc-bbae0daaaa1a1d0a17cdf4262d47b26538cc9ac1.tar.bz2 | |
Don't use shifts for extendsidi2
From-SVN: r13008
| -rw-r--r-- | gcc/config/mips/mips.md | 34 |
1 files changed, 9 insertions, 25 deletions
diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md index 7db5dca..4c8cec7 100644 --- a/gcc/config/mips/mips.md +++ b/gcc/config/mips/mips.md @@ -2508,35 +2508,19 @@ move\\t%0,%z4\\n\\ ;; Extension insns. ;; Those for integer source operand are ordered widest source type first. -(define_expand "extendsidi2" - [(set (match_operand:DI 0 "register_operand" "") - (sign_extend:DI (match_operand:SI 1 "nonimmediate_operand" "")))] - "TARGET_64BIT" - " -{ - if (optimize && GET_CODE (operands[1]) == MEM) - operands[1] = force_not_mem (operands[1]); - - if (GET_CODE (operands[1]) != MEM) - { - rtx op1 = gen_lowpart (DImode, operands[1]); - rtx temp = gen_reg_rtx (DImode); - rtx shift = gen_rtx (CONST_INT, VOIDmode, 32); +;; In 64 bit mode, 32 bit values in general registers are always +;; correctly sign extended. That means that if the target is a +;; general register, we can sign extend from SImode to DImode just by +;; doing a move. - emit_insn (gen_ashldi3 (temp, op1, shift)); - emit_insn (gen_ashrdi3 (operands[0], temp, shift)); - DONE; - } -}") - -(define_insn "extendsidi2_internal" - [(set (match_operand:DI 0 "register_operand" "=d,d") - (sign_extend:DI (match_operand:SI 1 "memory_operand" "R,m")))] +(define_insn "extendsidi2" + [(set (match_operand:DI 0 "register_operand" "=d,d,d") + (sign_extend:DI (match_operand:SI 1 "nonimmediate_operand" "d,R,m")))] "TARGET_64BIT" "* return mips_move_1word (operands, insn, FALSE);" - [(set_attr "type" "load") + [(set_attr "type" "move,load,load") (set_attr "mode" "DI") - (set_attr "length" "1,2")]) + (set_attr "length" "1,1,2")]) ;; These patterns originally accepted general_operands, however, slightly ;; better code is generated by only accepting register_operands, and then |