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tcg-aarch64: Use ORRI in tcg_out_movi

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The subset of logical immediates that we support is quite quick to test,
and such constants are quite common to want to load.

Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-09-11 13:34:38 -07:00 committed by Richard Henderson
parent dfeb5fe770
commit 4ec4f0bd56
1 changed files with 39 additions and 31 deletions
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70
tcg/aarch64/tcg-target.c
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@ -527,6 +527,37 @@ static void tcg_out_movr_sp(TCGContext *s, TCGType ext, TCGReg rd, TCGReg rn)
tcg_out_insn(s, 3401, ADDI, ext, rd, rn, 0);
}
/* This function is used for the Logical (immediate) instruction group.
The value of LIMM must satisfy IS_LIMM. See the comment above about
only supporting simplified logical immediates. */
static void tcg_out_logicali(TCGContext *s, AArch64Insn insn, TCGType ext,
TCGReg rd, TCGReg rn, uint64_t limm)
{
unsigned h, l, r, c;
assert(is_limm(limm));
h = clz64(limm);
l = ctz64(limm);
if (l == 0) {
r = 0; /* form 0....01....1 */
c = ctz64(~limm) - 1;
if (h == 0) {
r = clz64(~limm); /* form 1..10..01..1 */
c += r;
}
} else {
r = 64 - l; /* form 1....10....0 or 0..01..10..0 */
c = r - h - 1;
}
if (ext == TCG_TYPE_I32) {
r &= 31;
c &= 31;
}
tcg_out_insn_3404(s, insn, ext, rd, rn, ext, r, c);
}
static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
tcg_target_long value)
{
@ -547,6 +578,14 @@ static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
type = TCG_TYPE_I32;
}
/* Check for bitfield immediates. For the benefit of 32-bit quantities,
use the sign-extended value. That lets us match rotated values such
as 0xff0000ff with the same 64-bit logic matching 0xffffffffff0000ff. */
if (is_limm(svalue)) {
tcg_out_logicali(s, I3404_ORRI, type, rd, TCG_REG_XZR, svalue);
return;
}
/* Would it take fewer insns to begin with MOVN? For the value and its
inverse, count the number of 16-bit lanes that are 0. */
for (i = wantinv = imask = 0; i < 64; i += 16) {
@ -891,37 +930,6 @@ static void tcg_out_addsubi(TCGContext *s, int ext, TCGReg rd,
}
}
/* This function is used for the Logical (immediate) instruction group.
The value of LIMM must satisfy IS_LIMM. See the comment above about
only supporting simplified logical immediates. */
static void tcg_out_logicali(TCGContext *s, AArch64Insn insn, TCGType ext,
TCGReg rd, TCGReg rn, uint64_t limm)
{
unsigned h, l, r, c;
assert(is_limm(limm));
h = clz64(limm);
l = ctz64(limm);
if (l == 0) {
r = 0; /* form 0....01....1 */
c = ctz64(~limm) - 1;
if (h == 0) {
r = clz64(~limm); /* form 1..10..01..1 */
c += r;
}
} else {
r = 64 - l; /* form 1....10....0 or 0..01..10..0 */
c = r - h - 1;
}
if (ext == TCG_TYPE_I32) {
r &= 31;
c &= 31;
}
tcg_out_insn_3404(s, insn, ext, rd, rn, ext, r, c);
}
static inline void tcg_out_addsub2(TCGContext *s, int ext, TCGReg rl,
TCGReg rh, TCGReg al, TCGReg ah,
tcg_target_long bl, tcg_target_long bh,