From 01547f7f9283e416578323e5d5df3327ed4df3ee Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Wed, 14 Aug 2013 15:22:46 -0700
Subject: [PATCH] tcg: Constant fold div, rem
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
tcg/optimize.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
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);
--
2.30.2