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| author | Richard Henderson <rth@twiddle.net> | 2014-03-06 09:34:29 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2014-04-28 11:06:35 -0700 |
| commit | 8b66eefe0d3c5eafba498157a2f6169c9828b77b (patch) | |
| tree | c69a6415cd3696d4f1e684adbaf7e23cea23021f /tcg | |
| parent | 34b1a49cb11adf2a544e5737c1ea87499dd76d6c (diff) | |
| download | qemu-8b66eefe0d3c5eafba498157a2f6169c9828b77b.tar.gz | |
tcg-sparc: Use the RETURN instruction
Saves one insn per TB exit over JMPL+RESTORE.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/sparc/tcg-target.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/tcg/sparc/tcg-target.c b/tcg/sparc/tcg-target.c index 86229d5d70..b4a15af0ae 100644 --- a/tcg/sparc/tcg-target.c +++ b/tcg/sparc/tcg-target.c @@ -219,6 +219,7 @@ static const int tcg_target_call_oarg_regs[] = { #define RDY (INSN_OP(2) | INSN_OP3(0x28) | INSN_RS1(0)) #define WRY (INSN_OP(2) | INSN_OP3(0x30) | INSN_RD(0)) #define JMPL (INSN_OP(2) | INSN_OP3(0x38)) +#define RETURN (INSN_OP(2) | INSN_OP3(0x39)) #define SAVE (INSN_OP(2) | INSN_OP3(0x3c)) #define RESTORE (INSN_OP(2) | INSN_OP3(0x3d)) #define SETHI (INSN_OP(0) | INSN_OP2(0x4)) @@ -1142,10 +1143,15 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args, switch (opc) { case INDEX_op_exit_tb: - tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_I0, args[0]); - tcg_out_arithi(s, TCG_REG_G0, TCG_REG_I7, 8, JMPL); - tcg_out32(s, RESTORE | INSN_RD(TCG_REG_G0) | INSN_RS1(TCG_REG_G0) | - INSN_RS2(TCG_REG_G0)); + if (check_fit_tl(args[0], 13)) { + tcg_out_arithi(s, TCG_REG_G0, TCG_REG_I7, 8, RETURN); + tcg_out_movi_imm13(s, TCG_REG_O0, args[0]); + } else { + tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_I0, args[0] & ~0x3ff); + tcg_out_arithi(s, TCG_REG_G0, TCG_REG_I7, 8, RETURN); + tcg_out_arithi(s, TCG_REG_O0, TCG_REG_O0, + args[0] & 0x3ff, ARITH_OR); + } break; case INDEX_op_goto_tb: if (s->tb_jmp_offset) { |