Message ID | 1348766397-20731-8-git-send-email-rth@twiddle.net |
---|---|
State | New |
Headers | show |
On Thu, Sep 27, 2012 at 10:19:57AM -0700, Richard Henderson wrote: > Signed-off-by: Richard Henderson <rth@twiddle.net> > --- > tcg/optimize.c | 134 ++++++++++++++++++++++++++++++++++++++++----------------- > 1 file changed, 94 insertions(+), 40 deletions(-) > > diff --git a/tcg/optimize.c b/tcg/optimize.c > index dfac877..f6a16fd 100644 > --- a/tcg/optimize.c > +++ b/tcg/optimize.c > @@ -398,6 +398,40 @@ static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x, > } > } > > +/* Return 2 if the condition can't be simplified, and the result > + of the condition (0 or 1) if it can */ > +static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c) > +{ > + TCGArg al = p1[0], ah = p1[1]; > + TCGArg bl = p2[0], bh = p2[1]; > + > + if (temps[bl].state == TCG_TEMP_CONST > + && temps[bh].state == TCG_TEMP_CONST) { > + uint64_t b = ((uint64_t)temps[bh].val << 32) | (uint32_t)temps[bl].val; > + > + if (temps[al].state == TCG_TEMP_CONST > + && temps[ah].state == TCG_TEMP_CONST) { > + uint64_t a; > + a = ((uint64_t)temps[ah].val << 32) | (uint32_t)temps[al].val; > + return do_constant_folding_cond_64(a, b, c); > + } > + if (b == 0) { > + switch (c) { > + case TCG_COND_LTU: > + return 0; > + case TCG_COND_GEU: > + return 1; > + default: > + break; > + } > + } > + } > + if (temps_are_copies(al, bl) && temps_are_copies(ah, bh)) { > + return do_constant_folding_cond_eq(c); > + } > + return 2; > +} > + > static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2) > { > TCGArg a1 = *p1, a2 = *p2; > @@ -816,53 +850,73 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, > args += 6; > break; > case INDEX_op_brcond2_i32: > - /* Simplify LT/GE comparisons vs zero to a single compare > - vs the high word of the input. */ > - if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE) > - && temps[args[2]].state == TCG_TEMP_CONST > - && temps[args[3]].state == TCG_TEMP_CONST > - && temps[args[2]].val == 0 > - && temps[args[2]].val == 0) { > - gen_opc_buf[op_index] = INDEX_op_brcond_i32; > - args[0] = args[1]; > - args[1] = args[3]; > - args[2] = args[4]; > - args[3] = args[5]; > - gen_args += 4; > + tmp = do_constant_folding_cond2(&args[0], &args[2], args[4]); > + if (tmp != 2) { > + if (tmp) { > + gen_opc_buf[op_index] = INDEX_op_br; > + gen_args[0] = args[5]; > + gen_args += 1; > + } else { > + gen_opc_buf[op_index] = INDEX_op_nop; > + args += 6; > + break; > + } > } else { > - gen_args[0] = args[0]; > - gen_args[1] = args[1]; > - gen_args[2] = args[2]; > - gen_args[3] = args[3]; > - gen_args[4] = args[4]; > - gen_args[5] = args[5]; > - gen_args += 6; > + /* Simplify LT/GE comparisons vs zero to a single compare > + vs the high word of the input. */ > + if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE) > + && temps[args[2]].state == TCG_TEMP_CONST > + && temps[args[3]].state == TCG_TEMP_CONST > + && temps[args[2]].val == 0 > + && temps[args[2]].val == 0) { > + gen_opc_buf[op_index] = INDEX_op_brcond_i32; > + args[0] = args[1]; > + args[1] = args[3]; > + args[2] = args[4]; > + args[3] = args[5]; > + gen_args += 4; > + } else { > + gen_args[0] = args[0]; > + gen_args[1] = args[1]; > + gen_args[2] = args[2]; > + gen_args[3] = args[3]; > + gen_args[4] = args[4]; > + gen_args[5] = args[5]; > + gen_args += 6; > + } > } > memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info)); > args += 6; > break; > case INDEX_op_setcond2_i32: > - /* Simplify LT/GE comparisons vs zero to a single compare > - vs the high word of the input. */ > - if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE) > - && temps[args[3]].state == TCG_TEMP_CONST > - && temps[args[4]].state == TCG_TEMP_CONST > - && temps[args[3]].val == 0 > - && temps[args[4]].val == 0) { > - gen_opc_buf[op_index] = INDEX_op_setcond_i32; > - args[1] = args[2]; > - args[2] = args[4]; > - args[3] = args[5]; > - gen_args += 4; > + tmp = do_constant_folding_cond2(&args[1], &args[3], args[5]); > + if (tmp != 2) { > + gen_opc_buf[op_index] = INDEX_op_movi_i32; > + tcg_opt_gen_movi(gen_args, args[0], tmp); > + gen_args += 2; > } else { > - reset_temp(args[0]); > - gen_args[0] = args[0]; > - gen_args[1] = args[1]; > - gen_args[2] = args[2]; > - gen_args[3] = args[3]; > - gen_args[4] = args[4]; > - gen_args[5] = args[5]; > - gen_args += 6; > + /* Simplify LT/GE comparisons vs zero to a single compare > + vs the high word of the input. */ > + if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE) > + && temps[args[3]].state == TCG_TEMP_CONST > + && temps[args[4]].state == TCG_TEMP_CONST > + && temps[args[3]].val == 0 > + && temps[args[4]].val == 0) { > + gen_opc_buf[op_index] = INDEX_op_setcond_i32; > + args[1] = args[2]; > + args[2] = args[4]; > + args[3] = args[5]; > + gen_args += 4; > + } else { > + reset_temp(args[0]); > + gen_args[0] = args[0]; > + gen_args[1] = args[1]; > + gen_args[2] = args[2]; > + gen_args[3] = args[3]; > + gen_args[4] = args[4]; > + gen_args[5] = args[5]; > + gen_args += 6; > + } > } > args += 6; > break; Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/tcg/optimize.c b/tcg/optimize.c index dfac877..f6a16fd 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -398,6 +398,40 @@ static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x, } } +/* Return 2 if the condition can't be simplified, and the result + of the condition (0 or 1) if it can */ +static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c) +{ + TCGArg al = p1[0], ah = p1[1]; + TCGArg bl = p2[0], bh = p2[1]; + + if (temps[bl].state == TCG_TEMP_CONST + && temps[bh].state == TCG_TEMP_CONST) { + uint64_t b = ((uint64_t)temps[bh].val << 32) | (uint32_t)temps[bl].val; + + if (temps[al].state == TCG_TEMP_CONST + && temps[ah].state == TCG_TEMP_CONST) { + uint64_t a; + a = ((uint64_t)temps[ah].val << 32) | (uint32_t)temps[al].val; + return do_constant_folding_cond_64(a, b, c); + } + if (b == 0) { + switch (c) { + case TCG_COND_LTU: + return 0; + case TCG_COND_GEU: + return 1; + default: + break; + } + } + } + if (temps_are_copies(al, bl) && temps_are_copies(ah, bh)) { + return do_constant_folding_cond_eq(c); + } + return 2; +} + static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2) { TCGArg a1 = *p1, a2 = *p2; @@ -816,53 +850,73 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, args += 6; break; case INDEX_op_brcond2_i32: - /* Simplify LT/GE comparisons vs zero to a single compare - vs the high word of the input. */ - if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE) - && temps[args[2]].state == TCG_TEMP_CONST - && temps[args[3]].state == TCG_TEMP_CONST - && temps[args[2]].val == 0 - && temps[args[2]].val == 0) { - gen_opc_buf[op_index] = INDEX_op_brcond_i32; - args[0] = args[1]; - args[1] = args[3]; - args[2] = args[4]; - args[3] = args[5]; - gen_args += 4; + tmp = do_constant_folding_cond2(&args[0], &args[2], args[4]); + if (tmp != 2) { + if (tmp) { + gen_opc_buf[op_index] = INDEX_op_br; + gen_args[0] = args[5]; + gen_args += 1; + } else { + gen_opc_buf[op_index] = INDEX_op_nop; + args += 6; + break; + } } else { - gen_args[0] = args[0]; - gen_args[1] = args[1]; - gen_args[2] = args[2]; - gen_args[3] = args[3]; - gen_args[4] = args[4]; - gen_args[5] = args[5]; - gen_args += 6; + /* Simplify LT/GE comparisons vs zero to a single compare + vs the high word of the input. */ + if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE) + && temps[args[2]].state == TCG_TEMP_CONST + && temps[args[3]].state == TCG_TEMP_CONST + && temps[args[2]].val == 0 + && temps[args[2]].val == 0) { + gen_opc_buf[op_index] = INDEX_op_brcond_i32; + args[0] = args[1]; + args[1] = args[3]; + args[2] = args[4]; + args[3] = args[5]; + gen_args += 4; + } else { + gen_args[0] = args[0]; + gen_args[1] = args[1]; + gen_args[2] = args[2]; + gen_args[3] = args[3]; + gen_args[4] = args[4]; + gen_args[5] = args[5]; + gen_args += 6; + } } memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info)); args += 6; break; case INDEX_op_setcond2_i32: - /* Simplify LT/GE comparisons vs zero to a single compare - vs the high word of the input. */ - if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE) - && temps[args[3]].state == TCG_TEMP_CONST - && temps[args[4]].state == TCG_TEMP_CONST - && temps[args[3]].val == 0 - && temps[args[4]].val == 0) { - gen_opc_buf[op_index] = INDEX_op_setcond_i32; - args[1] = args[2]; - args[2] = args[4]; - args[3] = args[5]; - gen_args += 4; + tmp = do_constant_folding_cond2(&args[1], &args[3], args[5]); + if (tmp != 2) { + gen_opc_buf[op_index] = INDEX_op_movi_i32; + tcg_opt_gen_movi(gen_args, args[0], tmp); + gen_args += 2; } else { - reset_temp(args[0]); - gen_args[0] = args[0]; - gen_args[1] = args[1]; - gen_args[2] = args[2]; - gen_args[3] = args[3]; - gen_args[4] = args[4]; - gen_args[5] = args[5]; - gen_args += 6; + /* Simplify LT/GE comparisons vs zero to a single compare + vs the high word of the input. */ + if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE) + && temps[args[3]].state == TCG_TEMP_CONST + && temps[args[4]].state == TCG_TEMP_CONST + && temps[args[3]].val == 0 + && temps[args[4]].val == 0) { + gen_opc_buf[op_index] = INDEX_op_setcond_i32; + args[1] = args[2]; + args[2] = args[4]; + args[3] = args[5]; + gen_args += 4; + } else { + reset_temp(args[0]); + gen_args[0] = args[0]; + gen_args[1] = args[1]; + gen_args[2] = args[2]; + gen_args[3] = args[3]; + gen_args[4] = args[4]; + gen_args[5] = args[5]; + gen_args += 6; + } } args += 6; break;
Signed-off-by: Richard Henderson <rth@twiddle.net> --- tcg/optimize.c | 134 ++++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 94 insertions(+), 40 deletions(-)