xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2025-02-09 05:38:34 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

target-alpha: Use deposit and extract ops

Browse Source 
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-10-14 17:35:42 -05:00
parent 752b1be947
commit f49f1ae73b
1 changed files with 42 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
target/alpha/translate.c
View File

@ -949,7 +949,13 @@ static void gen_ext_h(DisasContext *ctx, TCGv vc, TCGv va, int rb, bool islit,
uint8_t lit, uint8_t byte_mask)
{
if (islit) {
tcg_gen_shli_i64(vc, va, (64 - lit * 8) & 0x3f);
int pos = (64 - lit * 8) & 0x3f;
int len = cto32(byte_mask) * 8;
if (pos < len) {
tcg_gen_deposit_z_i64(vc, va, pos, len - pos);
} else {
tcg_gen_movi_i64(vc, 0);
}
} else {
TCGv tmp = tcg_temp_new();
tcg_gen_shli_i64(tmp, load_gpr(ctx, rb), 3);
@ -966,38 +972,44 @@ static void gen_ext_l(DisasContext *ctx, TCGv vc, TCGv va, int rb, bool islit,
uint8_t lit, uint8_t byte_mask)
{
if (islit) {
tcg_gen_shri_i64(vc, va, (lit & 7) * 8);
int pos = (lit & 7) * 8;
int len = cto32(byte_mask) * 8;
if (pos + len >= 64) {
len = 64 - pos;
}
tcg_gen_extract_i64(vc, va, pos, len);
} else {
TCGv tmp = tcg_temp_new();
tcg_gen_andi_i64(tmp, load_gpr(ctx, rb), 7);
tcg_gen_shli_i64(tmp, tmp, 3);
tcg_gen_shr_i64(vc, va, tmp);
tcg_temp_free(tmp);
gen_zapnoti(vc, vc, byte_mask);
}
gen_zapnoti(vc, vc, byte_mask);
}
/* INSWH, INSLH, INSQH */
static void gen_ins_h(DisasContext *ctx, TCGv vc, TCGv va, int rb, bool islit,
uint8_t lit, uint8_t byte_mask)
{
TCGv tmp = tcg_temp_new();
/* The instruction description has us left-shift the byte mask and extract
bits <15:8> and apply that zap at the end. This is equivalent to simply
performing the zap first and shifting afterward. */
gen_zapnoti(tmp, va, byte_mask);
if (islit) {
lit &= 7;
if (unlikely(lit == 0)) {
tcg_gen_movi_i64(vc, 0);
int pos = 64 - (lit & 7) * 8;
int len = cto32(byte_mask) * 8;
if (pos < len) {
tcg_gen_extract_i64(vc, va, pos, len - pos);
} else {
tcg_gen_shri_i64(vc, tmp, 64 - lit * 8);
tcg_gen_movi_i64(vc, 0);
}
} else {
TCGv tmp = tcg_temp_new();
TCGv shift = tcg_temp_new();
/* The instruction description has us left-shift the byte mask
and extract bits <15:8> and apply that zap at the end. This
is equivalent to simply performing the zap first and shifting
afterward. */
gen_zapnoti(tmp, va, byte_mask);
/* If (B & 7) == 0, we need to shift by 64 and leave a zero. Do this
portably by splitting the shift into two parts: shift_count-1 and 1.
Arrange for the -1 by using ones-complement instead of
@ -1010,32 +1022,37 @@ static void gen_ins_h(DisasContext *ctx, TCGv vc, TCGv va, int rb, bool islit,
tcg_gen_shr_i64(vc, tmp, shift);
tcg_gen_shri_i64(vc, vc, 1);
tcg_temp_free(shift);
tcg_temp_free(tmp);
}
tcg_temp_free(tmp);
}
/* INSBL, INSWL, INSLL, INSQL */
static void gen_ins_l(DisasContext *ctx, TCGv vc, TCGv va, int rb, bool islit,
uint8_t lit, uint8_t byte_mask)
{
TCGv tmp = tcg_temp_new();
/* The instruction description has us left-shift the byte mask
the same number of byte slots as the data and apply the zap
at the end. This is equivalent to simply performing the zap
first and shifting afterward. */
gen_zapnoti(tmp, va, byte_mask);
if (islit) {
tcg_gen_shli_i64(vc, tmp, (lit & 7) * 8);
int pos = (lit & 7) * 8;
int len = cto32(byte_mask) * 8;
if (pos + len > 64) {
len = 64 - pos;
}
tcg_gen_deposit_z_i64(vc, va, pos, len);
} else {
TCGv tmp = tcg_temp_new();
TCGv shift = tcg_temp_new();
/* The instruction description has us left-shift the byte mask
and extract bits <15:8> and apply that zap at the end. This
is equivalent to simply performing the zap first and shifting
afterward. */
gen_zapnoti(tmp, va, byte_mask);
tcg_gen_andi_i64(shift, load_gpr(ctx, rb), 7);
tcg_gen_shli_i64(shift, shift, 3);
tcg_gen_shl_i64(vc, tmp, shift);
tcg_temp_free(shift);
tcg_temp_free(tmp);
}
tcg_temp_free(tmp);
}
/* MSKWH, MSKLH, MSKQH */