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| author | Richard Henderson <rth@twiddle.net> | 2014-01-28 13:15:38 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2014-02-17 10:12:29 -0600 |
| commit | e201b56418a5bb6afadc42df16f94880c091fad4 (patch) | |
| tree | f5f7fea281e5bc782bdd2c4272b4633d2db705fa /tcg | |
| parent | 23ec69ed3759fe5d8374cb22795ade1305c331c4 (diff) | |
| download | qemu-e201b56418a5bb6afadc42df16f94880c091fad4.tar.gz | |
tcg/optimize: Simply some logical ops to NOT
Given, of course, an appropriate constant. These could be generated
from the "canonical" operation for inversion on the guest, or via
other optimizations.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/optimize.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index 4bea8a56ef..0b1dd13a63 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -655,6 +655,63 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, } } break; + CASE_OP_32_64(xor): + CASE_OP_32_64(nand): + if (temps[args[1]].state != TCG_TEMP_CONST + && temps[args[2]].state == TCG_TEMP_CONST + && temps[args[2]].val == -1) { + i = 1; + goto try_not; + } + break; + CASE_OP_32_64(nor): + if (temps[args[1]].state != TCG_TEMP_CONST + && temps[args[2]].state == TCG_TEMP_CONST + && temps[args[2]].val == 0) { + i = 1; + goto try_not; + } + break; + CASE_OP_32_64(andc): + if (temps[args[2]].state != TCG_TEMP_CONST + && temps[args[1]].state == TCG_TEMP_CONST + && temps[args[1]].val == -1) { + i = 2; + goto try_not; + } + break; + CASE_OP_32_64(orc): + CASE_OP_32_64(eqv): + if (temps[args[2]].state != TCG_TEMP_CONST + && temps[args[1]].state == TCG_TEMP_CONST + && temps[args[1]].val == 0) { + i = 2; + goto try_not; + } + break; + try_not: + { + TCGOpcode not_op; + bool have_not; + + if (def->flags & TCG_OPF_64BIT) { + not_op = INDEX_op_not_i64; + have_not = TCG_TARGET_HAS_not_i64; + } else { + not_op = INDEX_op_not_i32; + have_not = TCG_TARGET_HAS_not_i32; + } + if (!have_not) { + break; + } + s->gen_opc_buf[op_index] = not_op; + reset_temp(args[0]); + gen_args[0] = args[0]; + gen_args[1] = args[i]; + args += 3; + gen_args += 2; + continue; + } default: break; } |