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authorRichard Henderson <rth@twiddle.net>2013-08-14 15:22:46 -0700
committerRichard Henderson <rth@twiddle.net>2013-09-02 09:08:29 -0700
commit01547f7f9283e416578323e5d5df3327ed4df3ee (patch)
tree41eb1bf55ebd5448bc62813a5327ef78e4d617ac /tcg
parent32f5717f07e5f801e482052311d21a4223fc78f1 (diff)
tcg: Constant fold div, rem
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/optimize.c23
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);