Commit ab92678d authored by Tom Musta's avatar Tom Musta Committed by Alexander Graf
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target-ppc: Special Case of rlwimi Should Use Deposit 



The special case of rlwimi where MB <= ME and SH = 31-ME can be implemented
with a single TCG deposit operation.  This replaces the less general case
of SH = MB = 0 and ME = 31.

Signed-off-by: default avatarTom Musta <tommusta@gmail.com>
Suggested-by: default avatarRichard Henderson <rth@twiddle.net>
Reviewed-by: default avatarRichard Henderson <rth@twiddle.net>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 439ce140

target-ppc/translate.c

+3 −6
Original line number Diff line number Diff line
@@ -1636,12 +1636,9 @@ static void gen_rlwimi(DisasContext *ctx) 
    mb = MB(ctx->opcode);

    me = ME(ctx->opcode);

    sh = SH(ctx->opcode);

    if (likely(sh == 0 && mb == 0 && me == 31)) {

#if defined(TARGET_PPC64)

        tcg_gen_mov_i64(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);

#else

        tcg_gen_ext32u_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);

#endif

    if (likely(sh == (31-me) && mb <= me)) {

        tcg_gen_deposit_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rA(ctx->opcode)],

                           cpu_gpr[rS(ctx->opcode)], sh, me - mb + 1);

    } else {

        target_ulong mask;

        TCGv t1;