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authorAurelien Jarno <aurelien@aurel32.net>2012-09-21 18:20:26 +0200
committerAurelien Jarno <aurelien@aurel32.net>2012-09-22 15:10:20 +0200
commitc1cf85c9acb847c4871c0b241ced8fabf410d502 (patch)
tree103a4dba75c4b111c829797304cb80cb3425d11f /tcg
parent0f46c064eebc9c93b8f925416e0812cc7b4bb503 (diff)
tcg/mips: optimize bswap{16,16s,32} on MIPS32R2
bswap operations can be optimized on MIPS32 Release 2 using the ROTR, WSBH and SEH instructions. We can't use the non-R2 code to implement the ops due to registers constraints, so don't define the corresponding TCG_TARGET_HAS_bswap* values. Also bswap16* operations are supposed to be called with the 16 high bits zeroed. This is the case everywhere (including for TCG by definition) except when called from the store helper. Remove the AND instructions from bswap16* and move it there. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'tcg')
-rw-r--r--tcg/mips/tcg-target.c34
-rw-r--r--tcg/mips/tcg-target.h11
2 files changed, 38 insertions, 7 deletions
diff --git a/tcg/mips/tcg-target.c b/tcg/mips/tcg-target.c
index 6aa4527257..8b2f9fc7d6 100644
--- a/tcg/mips/tcg-target.c
+++ b/tcg/mips/tcg-target.c
@@ -326,6 +326,7 @@ enum {
OPC_BGEZ = OPC_REGIMM | (0x01 << 16),
OPC_SPECIAL3 = 0x1f << 26,
+ OPC_WSBH = OPC_SPECIAL3 | 0x0a0,
OPC_SEB = OPC_SPECIAL3 | 0x420,
OPC_SEH = OPC_SPECIAL3 | 0x620,
};
@@ -419,36 +420,45 @@ static inline void tcg_out_movi(TCGContext *s, TCGType type,
static inline void tcg_out_bswap16(TCGContext *s, TCGReg ret, TCGReg arg)
{
+#ifdef _MIPS_ARCH_MIPS32R2
+ tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg);
+#else
/* ret and arg can't be register at */
if (ret == TCG_REG_AT || arg == TCG_REG_AT) {
tcg_abort();
}
tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8);
- tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0x00ff);
-
tcg_out_opc_sa(s, OPC_SLL, ret, arg, 8);
tcg_out_opc_imm(s, OPC_ANDI, ret, ret, 0xff00);
tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);
+#endif
}
static inline void tcg_out_bswap16s(TCGContext *s, TCGReg ret, TCGReg arg)
{
+#ifdef _MIPS_ARCH_MIPS32R2
+ tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg);
+ tcg_out_opc_reg(s, OPC_SEH, ret, 0, ret);
+#else
/* ret and arg can't be register at */
if (ret == TCG_REG_AT || arg == TCG_REG_AT) {
tcg_abort();
}
tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8);
- tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0xff);
-
tcg_out_opc_sa(s, OPC_SLL, ret, arg, 24);
tcg_out_opc_sa(s, OPC_SRA, ret, ret, 16);
tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);
+#endif
}
static inline void tcg_out_bswap32(TCGContext *s, TCGReg ret, TCGReg arg)
{
+#ifdef _MIPS_ARCH_MIPS32R2
+ tcg_out_opc_reg(s, OPC_WSBH, ret, 0, arg);
+ tcg_out_opc_sa(s, OPC_ROTR, ret, ret, 16);
+#else
/* ret and arg must be different and can't be register at */
if (ret == arg || ret == TCG_REG_AT || arg == TCG_REG_AT) {
tcg_abort();
@@ -466,6 +476,7 @@ static inline void tcg_out_bswap32(TCGContext *s, TCGReg ret, TCGReg arg)
tcg_out_opc_sa(s, OPC_SRL, TCG_REG_AT, arg, 8);
tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_AT, TCG_REG_AT, 0xff00);
tcg_out_opc_reg(s, OPC_OR, ret, ret, TCG_REG_AT);
+#endif
}
static inline void tcg_out_ext8s(TCGContext *s, TCGReg ret, TCGReg arg)
@@ -1188,7 +1199,8 @@ static void tcg_out_qemu_st(TCGContext *s, const TCGArg *args,
break;
case 1:
if (TCG_NEED_BSWAP) {
- tcg_out_bswap16(s, TCG_REG_T0, data_reg1);
+ tcg_out_opc_imm(s, OPC_ANDI, TCG_REG_T0, data_reg1, 0xffff);
+ tcg_out_bswap16(s, TCG_REG_T0, TCG_REG_T0);
tcg_out_opc_imm(s, OPC_SH, TCG_REG_T0, TCG_REG_A0, 0);
} else {
tcg_out_opc_imm(s, OPC_SH, data_reg1, TCG_REG_A0, 0);
@@ -1409,6 +1421,15 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
}
break;
+ /* The bswap routines do not work on non-R2 CPU. In that case
+ we let TCG generating the corresponding code. */
+ case INDEX_op_bswap16_i32:
+ tcg_out_bswap16(s, args[0], args[1]);
+ break;
+ case INDEX_op_bswap32_i32:
+ tcg_out_bswap32(s, args[0], args[1]);
+ break;
+
case INDEX_op_ext8s_i32:
tcg_out_ext8s(s, args[0], args[1]);
break;
@@ -1503,6 +1524,9 @@ static const TCGTargetOpDef mips_op_defs[] = {
{ INDEX_op_shr_i32, { "r", "rZ", "ri" } },
{ INDEX_op_sar_i32, { "r", "rZ", "ri" } },
+ { INDEX_op_bswap16_i32, { "r", "r" } },
+ { INDEX_op_bswap32_i32, { "r", "r" } },
+
{ INDEX_op_ext8s_i32, { "r", "rZ" } },
{ INDEX_op_ext16s_i32, { "r", "rZ" } },
diff --git a/tcg/mips/tcg-target.h b/tcg/mips/tcg-target.h
index 9c68a32582..c5c13f71d3 100644
--- a/tcg/mips/tcg-target.h
+++ b/tcg/mips/tcg-target.h
@@ -83,8 +83,6 @@ typedef enum {
#define TCG_TARGET_HAS_rot_i32 0
#define TCG_TARGET_HAS_ext8s_i32 1
#define TCG_TARGET_HAS_ext16s_i32 1
-#define TCG_TARGET_HAS_bswap32_i32 0
-#define TCG_TARGET_HAS_bswap16_i32 0
#define TCG_TARGET_HAS_andc_i32 0
#define TCG_TARGET_HAS_orc_i32 0
#define TCG_TARGET_HAS_eqv_i32 0
@@ -92,6 +90,15 @@ typedef enum {
#define TCG_TARGET_HAS_deposit_i32 0
#define TCG_TARGET_HAS_movcond_i32 0
+/* optional instructions only implemented on MIPS32R2 */
+#ifdef _MIPS_ARCH_MIPS32R2
+#define TCG_TARGET_HAS_bswap16_i32 1
+#define TCG_TARGET_HAS_bswap32_i32 1
+#else
+#define TCG_TARGET_HAS_bswap16_i32 0
+#define TCG_TARGET_HAS_bswap32_i32 0
+#endif
+
/* optional instructions automatically implemented */
#define TCG_TARGET_HAS_neg_i32 0 /* sub rd, zero, rt */
#define TCG_TARGET_HAS_ext8u_i32 0 /* andi rt, rs, 0xff */