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| author | Richard Henderson <rth@twiddle.net> | 2013-08-14 15:22:46 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2013-09-02 09:08:29 -0700 |
| commit | 01547f7f9283e416578323e5d5df3327ed4df3ee (patch) | |
| tree | 41eb1bf55ebd5448bc62813a5327ef78e4d617ac /tcg/optimize.c | |
| parent | 32f5717f07e5f801e482052311d21a4223fc78f1 (diff) | |
| download | qemu-01547f7f9283e416578323e5d5df3327ed4df3ee.zip | |
tcg: Constant fold div, rem
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg/optimize.c')
| -rw-r--r-- | tcg/optimize.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tcg/optimize.c b/tcg/optimize.c index e8dedf3eb4..b29bf25b67 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -304,6 +304,25 @@ static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y) muls64(&l64, &h64, x, y); return h64; + case INDEX_op_div_i32: + /* Avoid crashing on divide by zero, otherwise undefined. */ + return (int32_t)x / ((int32_t)y ? : 1); + case INDEX_op_divu_i32: + return (uint32_t)x / ((uint32_t)y ? : 1); + case INDEX_op_div_i64: + return (int64_t)x / ((int64_t)y ? : 1); + case INDEX_op_divu_i64: + return (uint64_t)x / ((uint64_t)y ? : 1); + + case INDEX_op_rem_i32: + return (int32_t)x % ((int32_t)y ? : 1); + case INDEX_op_remu_i32: + return (uint32_t)x % ((uint32_t)y ? : 1); + case INDEX_op_rem_i64: + return (int64_t)x % ((int64_t)y ? : 1); + case INDEX_op_remu_i64: + return (uint64_t)x % ((uint64_t)y ? : 1); + default: fprintf(stderr, "Unrecognized operation %d in do_constant_folding.\n", op); @@ -902,6 +921,10 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, CASE_OP_32_64(nor): CASE_OP_32_64(muluh): CASE_OP_32_64(mulsh): + CASE_OP_32_64(div): + CASE_OP_32_64(divu): + CASE_OP_32_64(rem): + CASE_OP_32_64(remu): if (temps[args[1]].state == TCG_TEMP_CONST && temps[args[2]].state == TCG_TEMP_CONST) { s->gen_opc_buf[op_index] = op_to_movi(op); |