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target-arm: Implement VMULL.P8

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Implement VMULL.P8 (the 32x32->64 version of the polynomial multiply
instruction).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-02-10 19:07:55 +00:00 committed by Aurelien Jarno
parent 02615337ef
commit e5ca24cba9
3 changed files with 35 additions and 2 deletions
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1
target-arm/helpers.h
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@ -277,6 +277,7 @@ DEF_HELPER_2(neon_sub_u16, i32, i32, i32)
DEF_HELPER_2(neon_mul_u8, i32, i32, i32)
DEF_HELPER_2(neon_mul_u16, i32, i32, i32)
DEF_HELPER_2(neon_mul_p8, i32, i32, i32)
DEF_HELPER_2(neon_mull_p8, i64, i32, i32)
DEF_HELPER_2(neon_tst_u8, i32, i32, i32)
DEF_HELPER_2(neon_tst_u16, i32, i32, i32)

30
target-arm/neon_helper.c
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@ -895,6 +895,36 @@ uint32_t HELPER(neon_mul_p8)(uint32_t op1, uint32_t op2)
return result;
}
uint64_t HELPER(neon_mull_p8)(uint32_t op1, uint32_t op2)
{
uint64_t result = 0;
uint64_t mask;
uint64_t op2ex = op2;
op2ex = (op2ex & 0xff) |
((op2ex & 0xff00) << 8) |
((op2ex & 0xff0000) << 16) |
((op2ex & 0xff000000) << 24);
while (op1) {
mask = 0;
if (op1 & 1) {
mask |= 0xffff;
}
if (op1 & (1 << 8)) {
mask |= (0xffffU << 16);
}
if (op1 & (1 << 16)) {
mask |= (0xffffULL << 32);
}
if (op1 & (1 << 24)) {
mask |= (0xffffULL << 48);
}
result ^= op2ex & mask;
op1 = (op1 >> 1) & 0x7f7f7f7f;
op2ex <<= 1;
}
return result;
}
#define NEON_FN(dest, src1, src2) dest = (src1 & src2) ? -1 : 0
NEON_VOP(tst_u8, neon_u8, 4)
NEON_VOP(tst_u16, neon_u16, 2)

6
target-arm/translate.c
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@ -5124,8 +5124,10 @@ static int disas_neon_data_insn(CPUState * env, DisasContext *s, uint32_t insn)
gen_neon_mull(cpu_V0, tmp, tmp2, size, u);
break;
case 14: /* Polynomial VMULL */
cpu_abort(env, "Polynomial VMULL not implemented");
gen_helper_neon_mull_p8(cpu_V0, tmp, tmp2);
dead_tmp(tmp2);
dead_tmp(tmp);
break;
default: /* 15 is RESERVED. */
return 1;
}