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tcg-sparc: Improve tcg_out_movi 

If bits 31:13 are zero, reduce the insn count by one.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-09-09 21:07:09 -07:00
parent 1d0a60681a
commit a9c7d27bd1
1 changed files with 34 additions and 24 deletions
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58
tcg/sparc/tcg-target.c
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@ -384,37 +384,47 @@ static inline void tcg_out_movi_imm13(TCGContext *s, int ret, uint32_t arg)
tcg_out_arithi(s, ret, TCG_REG_G0, arg, ARITH_OR);
}
static inline void tcg_out_movi_imm32(TCGContext *s, int ret, uint32_t arg)
static void tcg_out_movi(TCGContext *s, TCGType type,
TCGReg ret, tcg_target_long arg)
{
if (check_fit_tl(arg, 13))
tcg_out_movi_imm13(s, ret, arg);
else {
tcg_out_sethi(s, ret, arg);
if (arg & 0x3ff)
tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
}
}
tcg_target_long hi, lo;
static inline void tcg_out_movi(TCGContext *s, TCGType type,
TCGReg ret, tcg_target_long arg)
{
/* All 32-bit constants, as well as 64-bit constants with
no high bits set go through movi_imm32. */
/* A 13-bit constant sign-extended to 64-bits. */
if (check_fit_tl(arg, 13)) {
tcg_out_movi_imm13(s, ret, arg);
return;
}
/* A 32-bit constant, or 32-bit zero-extended to 64-bits. */
if (TCG_TARGET_REG_BITS == 32
|| type == TCG_TYPE_I32
|| (arg & ~(tcg_target_long)0xffffffff) == 0) {
tcg_out_movi_imm32(s, ret, arg);
} else if (check_fit_tl(arg, 13)) {
/* A 13-bit constant sign-extended to 64-bits. */
tcg_out_movi_imm13(s, ret, arg);
} else if (check_fit_tl(arg, 32)) {
/* A 32-bit constant sign-extended to 64-bits. */
|| (arg & ~0xffffffffu) == 0) {
tcg_out_sethi(s, ret, arg);
if (arg & 0x3ff) {
tcg_out_arithi(s, ret, ret, arg & 0x3ff, ARITH_OR);
}
return;
}
/* A 32-bit constant sign-extended to 64-bits. */
if (check_fit_tl(arg, 32)) {
tcg_out_sethi(s, ret, ~arg);
tcg_out_arithi(s, ret, ret, (arg & 0x3ff) | -0x400, ARITH_XOR);
} else {
tcg_out_movi_imm32(s, ret, arg >> (TCG_TARGET_REG_BITS / 2));
return;
}
/* A 64-bit constant decomposed into 2 32-bit pieces. */
lo = (int32_t)arg;
if (check_fit_tl(lo, 13)) {
hi = (arg - lo) >> 31 >> 1;
tcg_out_movi(s, TCG_TYPE_I32, ret, hi);
tcg_out_arithi(s, ret, ret, 32, SHIFT_SLLX);
tcg_out_arithi(s, ret, ret, lo, ARITH_ADD);
} else {
hi = arg >> 31 >> 1;
tcg_out_movi(s, TCG_TYPE_I32, ret, hi);
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_T2, lo);
tcg_out_arithi(s, ret, ret, 32, SHIFT_SLLX);
tcg_out_movi_imm32(s, TCG_REG_T2, arg);
tcg_out_arith(s, ret, ret, TCG_REG_T2, ARITH_OR);
}
}