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tcg: Optimize some forms of deposit. 

If the deposit replaces the entire word, optimize to a move.

If we're inserting to the top of the word, avoid the mask of arg2
as we'll be shifting out all of the garbage and shifting in zeros.

If the host is 32-bit, reduce a 64-bit deposit to a 32-bit deposit
when possible.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
master
Richard Henderson 2011-10-27 14:15:00 -07:00 committed by Blue Swirl
parent 7999f7e127
commit df072774cb
1 changed files with 51 additions and 14 deletions
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65
tcg/tcg-op.h
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@ -2045,38 +2045,75 @@ static inline void tcg_gen_deposit_i32(TCGv_i32 ret, TCGv_i32 arg1,
TCGv_i32 arg2, unsigned int ofs,
unsigned int len)
{
uint32_t mask;
TCGv_i32 t1;
if (ofs == 0 && len == 32) {
tcg_gen_mov_i32(ret, arg2);
return;
}
if (TCG_TARGET_HAS_deposit_i32 && TCG_TARGET_deposit_i32_valid(ofs, len)) {
tcg_gen_op5ii_i32(INDEX_op_deposit_i32, ret, arg1, arg2, ofs, len);
} else {
uint32_t mask = (1u << len) - 1;
TCGv_i32 t1 = tcg_temp_new_i32 ();
return;
}
mask = (1u << len) - 1;
t1 = tcg_temp_new_i32();
if (ofs + len < 32) {
tcg_gen_andi_i32(t1, arg2, mask);
tcg_gen_shli_i32(t1, t1, ofs);
tcg_gen_andi_i32(ret, arg1, ~(mask << ofs));
tcg_gen_or_i32(ret, ret, t1);
tcg_temp_free_i32(t1);
} else {
tcg_gen_shli_i32(t1, arg2, ofs);
}
tcg_gen_andi_i32(ret, arg1, ~(mask << ofs));
tcg_gen_or_i32(ret, ret, t1);
tcg_temp_free_i32(t1);
}
static inline void tcg_gen_deposit_i64(TCGv_i64 ret, TCGv_i64 arg1,
TCGv_i64 arg2, unsigned int ofs,
unsigned int len)
{
uint64_t mask;
TCGv_i64 t1;
if (ofs == 0 && len == 64) {
tcg_gen_mov_i64(ret, arg2);
return;
}
if (TCG_TARGET_HAS_deposit_i64 && TCG_TARGET_deposit_i64_valid(ofs, len)) {
tcg_gen_op5ii_i64(INDEX_op_deposit_i64, ret, arg1, arg2, ofs, len);
} else {
uint64_t mask = (1ull << len) - 1;
TCGv_i64 t1 = tcg_temp_new_i64 ();
return;
}
#if TCG_TARGET_REG_BITS == 32
if (ofs >= 32) {
tcg_gen_deposit_i32(TCGV_HIGH(ret), TCGV_HIGH(arg1),
TCGV_LOW(arg2), ofs - 32, len);
return;
}
if (ofs + len <= 32) {
tcg_gen_deposit_i32(TCGV_LOW(ret), TCGV_LOW(arg1),
TCGV_LOW(arg2), ofs, len);
return;
}
#endif
mask = (1ull << len) - 1;
t1 = tcg_temp_new_i64();
if (ofs + len < 64) {
tcg_gen_andi_i64(t1, arg2, mask);
tcg_gen_shli_i64(t1, t1, ofs);
tcg_gen_andi_i64(ret, arg1, ~(mask << ofs));
tcg_gen_or_i64(ret, ret, t1);
tcg_temp_free_i64(t1);
} else {
tcg_gen_shli_i64(t1, arg2, ofs);
}
tcg_gen_andi_i64(ret, arg1, ~(mask << ofs));
tcg_gen_or_i64(ret, ret, t1);
tcg_temp_free_i64(t1);
}
/***************************************/