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tcg-ia64: Optimize small arguments to exit_tb

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Saves one bundle for the common case of exit_tb 0.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-10-31 15:19:23 -04:00
parent c6138aabfb
commit dcf91778ca
1 changed files with 9 additions and 3 deletions
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12
tcg/ia64/tcg-target.c
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@ -950,15 +950,21 @@ static inline void tcg_out_callr(TCGContext *s, TCGReg addr)
static void tcg_out_exit_tb(TCGContext *s, tcg_target_long arg) static void tcg_out_exit_tb(TCGContext *s, tcg_target_long arg)
{ {
int64_t disp; int64_t disp;
uint64_t imm; uint64_t imm, opc1;
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R8, arg); /* At least arg == 0 is a common operation. */
if (arg == sextract64(arg, 0, 22)) {
opc1 = tcg_opc_movi_a(TCG_REG_P0, TCG_REG_R8, arg);
} else {
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_R8, arg);
opc1 = INSN_NOP_M;
}
disp = tb_ret_addr - s->code_ptr; disp = tb_ret_addr - s->code_ptr;
imm = (uint64_t)disp >> 4; imm = (uint64_t)disp >> 4;
tcg_out_bundle(s, mLX, tcg_out_bundle(s, mLX,
INSN_NOP_M, opc1,
tcg_opc_l3 (imm), tcg_opc_l3 (imm),
tcg_opc_x3 (TCG_REG_P0, OPC_BRL_SPTK_MANY_X3, imm)); tcg_opc_x3 (TCG_REG_P0, OPC_BRL_SPTK_MANY_X3, imm));
} }