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target-ppc: Special Case of rlwimi Should Use Deposit

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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: Tom Musta <tommusta@gmail.com>
Suggested-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-08-25 14:25:39 -05:00 committed by Alexander Graf
parent 439ce1401b
commit ab92678d0a
1 changed files with 3 additions and 6 deletions
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9
target-ppc/translate.c
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@ -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;