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tcg-ia64: Avoid unnecessary stop bit in tcg_out_alu 

When performing an operation with two input registers, we'd leave
the stop bit (and thus an extra cycle) that's only needed when one
or the other input is a constant.

Acked-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
master
Richard Henderson 2013-09-05 15:56:44 -04:00
parent d15de15ca0
commit 3c289cba9b
1 changed files with 6 additions and 11 deletions
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17
tcg/ia64/tcg-target.c
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@ -1044,31 +1044,26 @@ static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
}
}
static inline void tcg_out_alu(TCGContext *s, uint64_t opc_a1, TCGArg ret,
TCGArg arg1, int const_arg1,
TCGArg arg2, int const_arg2)
static void tcg_out_alu(TCGContext *s, uint64_t opc_a1, TCGReg ret, TCGArg arg1,
int const_arg1, TCGArg arg2, int const_arg2)
{
uint64_t opc1, opc2;
uint64_t opc1 = 0, opc2 = 0;
if (const_arg1 && arg1 != 0) {
opc1 = tcg_opc_a5(TCG_REG_P0, OPC_ADDL_A5,
TCG_REG_R2, arg1, TCG_REG_R0);
arg1 = TCG_REG_R2;
} else {
opc1 = INSN_NOP_M;
}
if (const_arg2 && arg2 != 0) {
opc2 = tcg_opc_a5(TCG_REG_P0, OPC_ADDL_A5,
TCG_REG_R3, arg2, TCG_REG_R0);
arg2 = TCG_REG_R3;
} else {
opc2 = INSN_NOP_I;
}
tcg_out_bundle(s, mII,
opc1,
opc2,
tcg_out_bundle(s, (opc1 || opc2 ? mII : miI),
opc1 ? opc1 : INSN_NOP_M,
opc2 ? opc2 : INSN_NOP_I,
tcg_opc_a1(TCG_REG_P0, opc_a1, ret, arg1, arg2));
}