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[Qemu-devel] [PATCH v2 3/9] tcg-arm: Allow constant first argument to su
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH v2 3/9] tcg-arm: Allow constant first argument to sub |
Date: |
Mon, 11 Mar 2013 23:43:45 -0700 |
This allows the generation of RSB instructions.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/arm/tcg-target.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c
index f470caa..7475142 100644
--- a/tcg/arm/tcg-target.c
+++ b/tcg/arm/tcg-target.c
@@ -1665,8 +1665,17 @@ 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,
@@ -1859,7 +1868,7 @@ 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" } },
--
1.8.1.2
- [Qemu-devel] [PATCH v2 0/9] tcg-arm improvements, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 1/9] tcg-arm: Use bic to implement and with constant, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 2/9] tcg-arm: Handle negated constant arguments to and/sub, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 3/9] tcg-arm: Allow constant first argument to sub,
Richard Henderson <=
- [Qemu-devel] [PATCH v2 4/9] tcg-arm: Use tcg_out_dat_rIN for compares, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 5/9] tcg-arm: Handle constant arguments to add2/sub2, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 6/9] tcg-arm: Improve constant generation, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 7/9] tcg-arm: Fold epilogue into INDEX_op_exit_tb, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 8/9] tcg-arm: Implement deposit for armv7, Richard Henderson, 2013/03/12
- [Qemu-devel] [PATCH v2 9/9] tcg-arm: Implement division instructions, Richard Henderson, 2013/03/12
- Re: [Qemu-devel] [PATCH v2 0/9] tcg-arm improvements, Laurent Desnogues, 2013/03/13
- Re: [Qemu-devel] [PATCH v2 0/9] tcg-arm improvements, Richard Henderson, 2013/03/19