From 39dc85b98561ea3de2b029f43a3a2db95c57afa3 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Thu, 4 Apr 2013 12:47:22 -0700 Subject: tcg-ppc64: Handle deposit of zero The TCG optimizer does great work when inserting constants, being able to fold the open-coded deposit expansion to just an AND or an OR. Avoid a bit the regression caused by having the deposit opcode by expanding deposit of zero as an AND. Reviewed-by: Aurelien Jarno Signed-off-by: Richard Henderson --- tcg/ppc64/tcg-target.c | 22 ++++++++++++++++------ 1 file changed, 16 insertions(+), 6 deletions(-) (limited to 'tcg') diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c index 0f33583..0fcf2b5 100644 --- a/tcg/ppc64/tcg-target.c +++ b/tcg/ppc64/tcg-target.c @@ -1928,12 +1928,22 @@ static void tcg_out_op (TCGContext *s, TCGOpcode opc, const TCGArg *args, break; case INDEX_op_deposit_i32: - tcg_out_rlw(s, RLWIMI, args[0], args[2], args[3], - 32 - args[3] - args[4], 31 - args[3]); + if (const_args[2]) { + uint32_t mask = ((2u << (args[4] - 1)) - 1) << args[3]; + tcg_out_andi32(s, args[0], args[0], ~mask); + } else { + tcg_out_rlw(s, RLWIMI, args[0], args[2], args[3], + 32 - args[3] - args[4], 31 - args[3]); + } break; case INDEX_op_deposit_i64: - tcg_out_rld(s, RLDIMI, args[0], args[2], args[3], - 64 - args[3] - args[4]); + if (const_args[2]) { + uint64_t mask = ((2ull << (args[4] - 1)) - 1) << args[3]; + tcg_out_andi64(s, args[0], args[0], ~mask); + } else { + tcg_out_rld(s, RLDIMI, args[0], args[2], args[3], + 64 - args[3] - args[4]); + } break; case INDEX_op_movcond_i32: @@ -2136,8 +2146,8 @@ static const TCGTargetOpDef ppc_op_defs[] = { { INDEX_op_bswap32_i64, { "r", "r" } }, { INDEX_op_bswap64_i64, { "r", "r" } }, - { INDEX_op_deposit_i32, { "r", "0", "r" } }, - { INDEX_op_deposit_i64, { "r", "0", "r" } }, + { INDEX_op_deposit_i32, { "r", "0", "rZ" } }, + { INDEX_op_deposit_i64, { "r", "0", "rZ" } }, { INDEX_op_add2_i64, { "r", "r", "r", "rI", "r", "rZM" } }, { INDEX_op_sub2_i64, { "r", "r", "rI", "r", "rZM", "r" } }, -- cgit v1.1