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tcg-arm: Implement division instructions 

An armv7 extension implements division, present on Cortex A15.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
stable-1.5
Richard Henderson 2013-03-11 22:11:30 -07:00 committed by Aurelien Jarno
parent b6b24cb031
commit 0637c56c99
3 changed files with 46 additions and 1 deletions
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4
disas/arm.c
View File

@ -819,6 +819,10 @@ static const struct opcode32 arm_opcodes[] =
{ARM_EXT_V3M, 0x00800090, 0x0fa000f0, "%22?sumull%20's%c\t%12-15r, %16-19r, %0-3r, %8-11r"},
{ARM_EXT_V3M, 0x00a00090, 0x0fa000f0, "%22?sumlal%20's%c\t%12-15r, %16-19r, %0-3r, %8-11r"},
/* IDIV instructions. */
{ARM_EXT_DIV, 0x0710f010, 0x0ff0f0f0, "sdiv%c\t%16-19r, %0-3r, %8-11r"},
{ARM_EXT_DIV, 0x0730f010, 0x0ff0f0f0, "udiv%c\t%16-19r, %0-3r, %8-11r"},
/* V7 instructions. */
{ARM_EXT_V7, 0xf450f000, 0xfd70f000, "pli\t%P"},
{ARM_EXT_V7, 0x0320f0f0, 0x0ffffff0, "dbg%c\t#%0-3d"},

36
tcg/arm/tcg-target.c
View File

@ -597,6 +597,16 @@ static inline void tcg_out_smull32(TCGContext *s,
}
}
static inline void tcg_out_sdiv(TCGContext *s, int cond, int rd, int rn, int rm)
{
tcg_out32(s, 0x0710f010 | (cond << 28) | (rd << 16) | rn | (rm << 8));
}
static inline void tcg_out_udiv(TCGContext *s, int cond, int rd, int rn, int rm)
{
tcg_out32(s, 0x0730f010 | (cond << 28) | (rd << 16) | rn | (rm << 8));
}
static inline void tcg_out_ext8s(TCGContext *s, int cond,
int rd, int rn)
{
@ -1868,6 +1878,25 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
args[3], args[4], const_args[2]);
break;
case INDEX_op_div_i32:
tcg_out_sdiv(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_divu_i32:
tcg_out_udiv(s, COND_AL, args[0], args[1], args[2]);
break;
case INDEX_op_rem_i32:
tcg_out_sdiv(s, COND_AL, TCG_REG_R8, args[1], args[2]);
tcg_out_mul32(s, COND_AL, TCG_REG_R8, TCG_REG_R8, args[2]);
tcg_out_dat_reg(s, COND_AL, ARITH_SUB, args[0], args[1], TCG_REG_R8,
SHIFT_IMM_LSL(0));
break;
case INDEX_op_remu_i32:
tcg_out_udiv(s, COND_AL, TCG_REG_R8, args[1], args[2]);
tcg_out_mul32(s, COND_AL, TCG_REG_R8, TCG_REG_R8, args[2]);
tcg_out_dat_reg(s, COND_AL, ARITH_SUB, args[0], args[1], TCG_REG_R8,
SHIFT_IMM_LSL(0));
break;
default:
tcg_abort();
}
@ -1954,6 +1983,13 @@ static const TCGTargetOpDef arm_op_defs[] = {
{ INDEX_op_deposit_i32, { "r", "0", "rZ" } },
#if TCG_TARGET_HAS_div_i32
{ INDEX_op_div_i32, { "r", "r", "r" } },
{ INDEX_op_rem_i32, { "r", "r", "r" } },
{ INDEX_op_divu_i32, { "r", "r", "r" } },
{ INDEX_op_remu_i32, { "r", "r", "r" } },
#endif
{ -1 },
};

7
tcg/arm/tcg-target.h
View File

@ -56,7 +56,6 @@ typedef enum {
#define TCG_TARGET_CALL_STACK_OFFSET 0
/* optional instructions */
#define TCG_TARGET_HAS_div_i32 0
#define TCG_TARGET_HAS_ext8s_i32 1
#define TCG_TARGET_HAS_ext16s_i32 1
#define TCG_TARGET_HAS_ext8u_i32 0 /* and r0, r1, #0xff */
@ -75,6 +74,12 @@ typedef enum {
#define TCG_TARGET_HAS_movcond_i32 1
#define TCG_TARGET_HAS_muls2_i32 1
#ifdef __ARM_ARCH_EXT_IDIV__
#define TCG_TARGET_HAS_div_i32 1
#else
#define TCG_TARGET_HAS_div_i32 0
#endif
extern bool tcg_target_deposit_valid(int ofs, int len);
#define TCG_TARGET_deposit_i32_valid tcg_target_deposit_valid