Use this in implementing rl[wd]imi, at least for the cases
that don't require true rotation.
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
target-ppc/translate.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 74e06d7..f45c0ec 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -1516,6 +1516,11 @@ static void gen_rlwimi(DisasContext *ctx)
sh = SH(ctx->opcode);
if (likely(sh == 0 && mb == 0 && me == 31)) {
tcg_gen_ext32u_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);
+ } else if ((31 - me) == sh && mb <= me) {
+ /* This is a well-behaved bitfield deposit. */
+ 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;
@@ -1761,6 +1766,11 @@ static inline void gen_rldimi(DisasContext *ctx, int
mbn, int shn)
me = 63 - sh;
if (unlikely(sh == 0 && mb == 0)) {
tcg_gen_mov_tl(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rS(ctx->opcode)]);
+ } else if (mb <= me) {
+ /* This is a well-behaved bitfield deposit. */
+ tcg_gen_deposit_tl (cpu_gpr[rA(ctx->opcode)],
+ cpu_gpr[rA(ctx->opcode)],
+ cpu_gpr[rS(ctx->opcode)], sh, me - mb + 1);
} else {
TCGv t0, t1;
target_ulong mask;
--
1.7.2.3
