From d9fda57549877045aa0ec91d2a067a67cb41a29f Mon Sep 17 00:00:00 2001
From: Richard Henderson <rth@twiddle.net>
Date: Mon, 11 Mar 2013 18:04:14 -0700
Subject: tcg-arm: Allow constant first argument to sub
This allows the generation of RSB instructions.
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
tcg/arm/tcg-target.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
(limited to 'tcg/arm/tcg-target.c')
diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c
index de8465bc49..6c7113b471 100644
--- a/tcg/arm/tcg-target.c
+++ b/tcg/arm/tcg-target.c
@@ -1625,8 +1625,17 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
args[0], args[1], args[2], const_args[2]);
break;
case INDEX_op_sub_i32:
- tcg_out_dat_rIN(s, COND_AL, ARITH_SUB, ARITH_ADD,
- args[0], args[1], args[2], const_args[2]);
+ if (const_args[1]) {
+ if (const_args[2]) {
+ tcg_out_movi32(s, COND_AL, args[0], args[1] - args[2]);
+ } else {
+ tcg_out_dat_rI(s, COND_AL, ARITH_RSB,
+ args[0], args[2], args[1], 1);
+ }
+ } else {
+ tcg_out_dat_rIN(s, COND_AL, ARITH_SUB, ARITH_ADD,
+ args[0], args[1], args[2], const_args[2]);
+ }
break;
case INDEX_op_and_i32:
tcg_out_dat_rIK(s, COND_AL, ARITH_AND, ARITH_BIC,
@@ -1819,7 +1828,7 @@ static const TCGTargetOpDef arm_op_defs[] = {
/* TODO: "r", "r", "ri" */
{ INDEX_op_add_i32, { "r", "r", "rIN" } },
- { INDEX_op_sub_i32, { "r", "r", "rIN" } },
+ { INDEX_op_sub_i32, { "r", "rI", "rIN" } },
{ INDEX_op_mul_i32, { "r", "r", "r" } },
{ INDEX_op_mulu2_i32, { "r", "r", "r", "r" } },
{ INDEX_op_muls2_i32, { "r", "r", "r", "r" } },
--
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