haraldwolff/qemu-patch-raspberry4
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target-tilegx: Handle most bit manipulation instructions

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The crc instructions are omitted from this set.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-08-20 21:30:51 -07:00
parent 42fedbca8f
commit 7f41a8d672
3 changed files with 79 additions and 1 deletions
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10
target-tilegx/helper.c
View file

@ -40,6 +40,16 @@ uint64_t helper_cnttz(uint64_t arg)
return ctz64(arg);
}
uint64_t helper_pcnt(uint64_t arg)
{
return ctpop64(arg);
}
uint64_t helper_revbits(uint64_t arg)
{
return revbit64(arg);
}
/*
* Functional Description
* uint64_t a = rf[SrcA];

2
target-tilegx/helper.h
View file

@ -1,4 +1,6 @@
DEF_HELPER_2(exception, noreturn, env, i32)
DEF_HELPER_FLAGS_1(cntlz, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_1(cnttz, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_1(pcnt, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_1(revbits, TCG_CALL_NO_RWG_SE, i64, i64)
DEF_HELPER_FLAGS_3(shufflebytes, TCG_CALL_NO_RWG_SE, i64, i64, i64, i64)

68
target-tilegx/translate.c
View file

@ -177,6 +177,43 @@ static void gen_saturate_op(TCGv tdest, TCGv tsrca, TCGv tsrcb,
tcg_temp_free(t0);
}
/* Shift the 128-bit value TSRCA:TSRCD right by the number of bytes
specified by the bottom 3 bits of TSRCB, and set TDEST to the
low 64 bits of the resulting value. */
static void gen_dblalign(TCGv tdest, TCGv tsrcd, TCGv tsrca, TCGv tsrcb)
{
TCGv t0 = tcg_temp_new();
tcg_gen_andi_tl(t0, tsrcb, 7);
tcg_gen_shli_tl(t0, t0, 3);
tcg_gen_shr_tl(tdest, tsrcd, t0);
/* We want to do "t0 = tsrca << (64 - t0)". Two's complement
arithmetic on a 6-bit field tells us that 64 - t0 is equal
to (t0 ^ 63) + 1. So we can do the shift in two parts,
neither of which will be an invalid shift by 64. */
tcg_gen_xori_tl(t0, t0, 63);
tcg_gen_shl_tl(t0, tsrca, t0);
tcg_gen_shli_tl(t0, t0, 1);
tcg_gen_or_tl(tdest, tdest, t0);
tcg_temp_free(t0);
}
/* Similarly, except that the 128-bit value is TSRCA:TSRCB, and the
right shift is an immediate. */
static void gen_dblaligni(TCGv tdest, TCGv tsrca, TCGv tsrcb, int shr)
{
TCGv t0 = tcg_temp_new();
tcg_gen_shri_tl(t0, tsrcb, shr);
tcg_gen_shli_tl(tdest, tsrca, 64 - shr);
tcg_gen_or_tl(tdest, tdest, t0);
tcg_temp_free(t0);
}
static TileExcp gen_rr_opcode(DisasContext *dc, unsigned opext,
unsigned dest, unsigned srca)
{
@ -210,8 +247,14 @@ static TileExcp gen_rr_opcode(DisasContext *dc, unsigned opext,
switch (opext) {
case OE_RR_X0(CNTLZ):
case OE_RR_Y0(CNTLZ):
gen_helper_cntlz(tdest, tsrca);
mnemonic = "cntlz";
break;
case OE_RR_X0(CNTTZ):
case OE_RR_Y0(CNTTZ):
gen_helper_cnttz(tdest, tsrca);
mnemonic = "cnttz";
break;
case OE_RR_X1(DRAIN):
case OE_RR_X1(DTLBPR):
case OE_RR_X1(FINV):
@ -251,11 +294,17 @@ static TileExcp gen_rr_opcode(DisasContext *dc, unsigned opext,
case OE_RR_Y1(LNK):
case OE_RR_X1(MF):
case OE_RR_X1(NAP):
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
case OE_RR_X0(PCNT):
case OE_RR_Y0(PCNT):
gen_helper_pcnt(tdest, tsrca);
mnemonic = "pcnt";
break;
case OE_RR_X0(REVBITS):
case OE_RR_Y0(REVBITS):
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
gen_helper_revbits(tdest, tsrca);
mnemonic = "revbits";
break;
case OE_RR_X0(REVBYTES):
case OE_RR_Y0(REVBYTES):
tcg_gen_bswap64_tl(tdest, tsrca);
@ -358,13 +407,26 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
case OE_RRR(CMUL, 0, X0):
case OE_RRR(CRC32_32, 0, X0):
case OE_RRR(CRC32_8, 0, X0):
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
case OE_RRR(DBLALIGN2, 0, X0):
case OE_RRR(DBLALIGN2, 0, X1):
gen_dblaligni(tdest, tsrca, tsrcb, 16);
mnemonic = "dblalign2";
break;
case OE_RRR(DBLALIGN4, 0, X0):
case OE_RRR(DBLALIGN4, 0, X1):
gen_dblaligni(tdest, tsrca, tsrcb, 32);
mnemonic = "dblalign4";
break;
case OE_RRR(DBLALIGN6, 0, X0):
case OE_RRR(DBLALIGN6, 0, X1):
gen_dblaligni(tdest, tsrca, tsrcb, 48);
mnemonic = "dblalign6";
break;
case OE_RRR(DBLALIGN, 0, X0):
gen_dblalign(tdest, load_gr(dc, dest), tsrca, tsrcb);
mnemonic = "dblalign";
break;
case OE_RRR(EXCH4, 0, X1):
case OE_RRR(EXCH, 0, X1):
case OE_RRR(FDOUBLE_ADDSUB, 0, X0):
@ -516,7 +578,11 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
case OE_RRR(SHRU, 0, X1):
case OE_RRR(SHRU, 6, Y0):
case OE_RRR(SHRU, 6, Y1):
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
case OE_RRR(SHUFFLEBYTES, 0, X0):
gen_helper_shufflebytes(tdest, load_gr(dc, dest), tsrca, tsrca);
mnemonic = "shufflebytes";
break;
case OE_RRR(ST1, 0, X1):
case OE_RRR(ST2, 0, X1):
case OE_RRR(ST4, 0, X1):