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tcg/aarch64: Use MVNI in tcg_out_dupi_vec

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The compliment of a subset of immediates can be computed
with a single instruction.

Backports commit 7e308e003e5b6ddd3130e09711e1d33693230696 from qemu
This commit is contained in:
Richard Henderson 2019-05-24 18:42:38 -04:00 committed by Lioncash
parent c18ec586dc
commit 06058ef648
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 11 additions and 0 deletions
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11
qemu/tcg/aarch64/tcg-target.inc.c
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@ -491,6 +491,7 @@ typedef enum {
/* AdvSIMD modified immediate */
I3606_MOVI = 0x0f000400,
I3606_MVNI = 0x2f000400,
/* AdvSIMD shift by immediate */
I3614_SSHR = 0x0f000400,
@ -835,8 +836,13 @@ static void tcg_out_dupi_vec(TCGContext *s, TCGType type,
tcg_out_insn(s, 3606, MOVI, q, rd, 0, cmode, imm8);
return;
}
if (is_shimm16(~v16, &cmode, &imm8)) {
tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
return;
}
} else if (v64 == dup_const(MO_32, v64)) {
uint32_t v32 = v64;
uint32_t n32 = ~v32;
if (is_shimm32(v32, &cmode, &imm8) ||
is_soimm32(v32, &cmode, &imm8) ||
@ -844,6 +850,11 @@ static void tcg_out_dupi_vec(TCGContext *s, TCGType type,
tcg_out_insn(s, 3606, MOVI, q, rd, 0, cmode, imm8);
return;
}
if (is_shimm32(n32, &cmode, &imm8) ||
is_soimm32(n32, &cmode, &imm8)) {
tcg_out_insn(s, 3606, MVNI, q, rd, 0, cmode, imm8);
return;
}
} else if (is_fimm64(v64, &cmode, &imm8)) {
tcg_out_insn(s, 3606, MOVI, q, rd, 1, cmode, imm8);
return;