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tcg-arm: Cleanup multiply subroutines

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Make the code more readable by only having one copy of the magic
numbers, swapping registers as needed prior to that.  Speed the
compiler by not applying the rd == rn avoidance for v6 or later.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-03-12 10:34:18 -07:00 committed by Aurelien Jarno
parent 13dd6fb962
commit 34358a12c8
1 changed files with 44 additions and 39 deletions
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83
tcg/arm/tcg-target.c
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@ -548,55 +548,60 @@ static void tcg_out_dat_rIN(TCGContext *s, int cond, int opc, int opneg,
}
}
static inline void tcg_out_mul32(TCGContext *s,
int cond, int rd, int rs, int rm)
static inline void tcg_out_mul32(TCGContext *s, int cond, TCGReg rd,
TCGReg rn, TCGReg rm)
{
if (rd != rm)
tcg_out32(s, (cond << 28) | (rd << 16) | (0 << 12) |
(rs << 8) | 0x90 | rm);
else if (rd != rs)
tcg_out32(s, (cond << 28) | (rd << 16) | (0 << 12) |
(rm << 8) | 0x90 | rs);
else {
tcg_out32(s, (cond << 28) | (TCG_REG_TMP << 16) | (0 << 12) |
(rs << 8) | 0x90 | rm);
tcg_out_dat_reg(s, cond, ARITH_MOV,
rd, 0, TCG_REG_TMP, SHIFT_IMM_LSL(0));
/* if ArchVersion() < 6 && d == n then UNPREDICTABLE; */
if (!use_armv6_instructions && rd == rn) {
if (rd == rm) {
/* rd == rn == rm; copy an input to tmp first. */
tcg_out_mov_reg(s, cond, TCG_REG_TMP, rn);
rm = rn = TCG_REG_TMP;
} else {
rn = rm;
rm = rd;
}
}
/* mul */
tcg_out32(s, (cond << 28) | 0x90 | (rd << 16) | (rm << 8) | rn);
}
static inline void tcg_out_umull32(TCGContext *s,
int cond, int rd0, int rd1, int rs, int rm)
static inline void tcg_out_umull32(TCGContext *s, int cond, TCGReg rd0,
TCGReg rd1, TCGReg rn, TCGReg rm)
{
if (rd0 != rm && rd1 != rm)
tcg_out32(s, (cond << 28) | 0x800090 |
(rd1 << 16) | (rd0 << 12) | (rs << 8) | rm);
else if (rd0 != rs && rd1 != rs)
tcg_out32(s, (cond << 28) | 0x800090 |
(rd1 << 16) | (rd0 << 12) | (rm << 8) | rs);
else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, rm, SHIFT_IMM_LSL(0));
tcg_out32(s, (cond << 28) | 0x800090 | TCG_REG_TMP |
(rd1 << 16) | (rd0 << 12) | (rs << 8));
/* if ArchVersion() < 6 && (dHi == n || dLo == n) then UNPREDICTABLE; */
if (!use_armv6_instructions && (rd0 == rn || rd1 == rn)) {
if (rd0 == rm || rd1 == rm) {
tcg_out_mov_reg(s, cond, TCG_REG_TMP, rn);
rn = TCG_REG_TMP;
} else {
TCGReg t = rn;
rn = rm;
rm = t;
}
}
/* umull */
tcg_out32(s, (cond << 28) | 0x00800090 |
(rd1 << 16) | (rd0 << 12) | (rm << 8) | rn);
}
static inline void tcg_out_smull32(TCGContext *s,
int cond, int rd0, int rd1, int rs, int rm)
static inline void tcg_out_smull32(TCGContext *s, int cond, TCGReg rd0,
TCGReg rd1, TCGReg rn, TCGReg rm)
{
if (rd0 != rm && rd1 != rm)
tcg_out32(s, (cond << 28) | 0xc00090 |
(rd1 << 16) | (rd0 << 12) | (rs << 8) | rm);
else if (rd0 != rs && rd1 != rs)
tcg_out32(s, (cond << 28) | 0xc00090 |
(rd1 << 16) | (rd0 << 12) | (rm << 8) | rs);
else {
tcg_out_dat_reg(s, cond, ARITH_MOV,
TCG_REG_TMP, 0, rm, SHIFT_IMM_LSL(0));
tcg_out32(s, (cond << 28) | 0xc00090 | TCG_REG_TMP |
(rd1 << 16) | (rd0 << 12) | (rs << 8));
/* if ArchVersion() < 6 && (dHi == n || dLo == n) then UNPREDICTABLE; */
if (!use_armv6_instructions && (rd0 == rn || rd1 == rn)) {
if (rd0 == rm || rd1 == rm) {
tcg_out_mov_reg(s, cond, TCG_REG_TMP, rn);
rn = TCG_REG_TMP;
} else {
TCGReg t = rn;
rn = rm;
rm = t;
}
}
/* smull */
tcg_out32(s, (cond << 28) | 0x00c00090 |
(rd1 << 16) | (rd0 << 12) | (rm << 8) | rn);
}
static inline void tcg_out_sdiv(TCGContext *s, int cond, int rd, int rn, int rm)