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| author | Richard Henderson <rth@twiddle.net> | 2012-10-02 11:32:25 -0700 |
|---|---|---|
| committer | Aurelien Jarno <aurelien@aurel32.net> | 2012-10-17 17:32:29 +0200 |
| commit | bc1473eff4d9a3b62d669b7232383f85eb82b376 (patch) | |
| tree | 745e6b07bfcacbb7480f089aad748bf24ce0c91a /tcg/optimize.c | |
| parent | 6e14e91b6681dac9614b7b09b561351813046193 (diff) | |
| download | qemu-bc1473eff4d9a3b62d669b7232383f85eb82b376.tar.gz | |
tcg: Optimize double-word comparisons against zero
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg/optimize.c')
| -rw-r--r-- | tcg/optimize.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index 0fd7db3654..0a55352870 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -752,6 +752,45 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, } goto do_default; + 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[3]].val == 0) { + gen_opc_buf[op_index] = INDEX_op_brcond_i32; + gen_args[0] = args[1]; + gen_args[1] = args[3]; + gen_args[2] = args[4]; + gen_args[3] = args[5]; + gen_args += 4; + args += 6; + memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info)); + break; + } + goto do_default; + + 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; + gen_args[0] = args[0]; + gen_args[1] = args[2]; + gen_args[2] = args[4]; + gen_args[3] = args[5]; + gen_args += 4; + args += 6; + break; + } + goto do_default; + case INDEX_op_call: nb_call_args = (args[0] >> 16) + (args[0] & 0xffff); if (!(args[nb_call_args + 1] & (TCG_CALL_CONST | TCG_CALL_PURE))) { |