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target/ppc: Implement setbc/setbcr/stnbc/setnbcr instructions 

Implements the following PowerISA v3.1 instructions:
setbc: Set Boolean Condition
setbcr: Set Boolean Condition Reverse
setnbc: Set Negative Boolean Condition
setnbcr: Set Negative Boolean Condition Reverse

Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210601193528.2533031-11-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Matheus Ferst 2021-06-01 16:35:24 -03:00 committed by David Gibson
parent b0f7bebc6d
commit 9a14365eeb
2 changed files with 33 additions and 0 deletions
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10
target/ppc/insn32.decode
View File

@ -26,6 +26,9 @@
&X rt ra rb
@X ...... rt:5 ra:5 rb:5 .......... . &X
&X_bi rt bi
@X_bi ...... rt:5 bi:5 ----- .......... - &X_bi
### Fixed-Point Load Instructions
LBZ 100010 ..... ..... ................ @D
@ -83,3 +86,10 @@ STDUX 011111 ..... ..... ..... 0010110101 - @X
ADDI 001110 ..... ..... ................ @D
ADDIS 001111 ..... ..... ................ @D
### Move To/From System Register Instructions
SETBC 011111 ..... ..... ----- 0110000000 - @X_bi
SETBCR 011111 ..... ..... ----- 0110100000 - @X_bi
SETNBC 011111 ..... ..... ----- 0111000000 - @X_bi
SETNBCR 011111 ..... ..... ----- 0111100000 - @X_bi

23
target/ppc/translate/fixedpoint-impl.c.inc
View File

@ -204,3 +204,26 @@ static bool trans_PNOP(DisasContext *ctx, arg_PNOP *a)
{
return true;
}
static bool do_set_bool_cond(DisasContext *ctx, arg_X_bi *a, bool neg, bool rev)
{
REQUIRE_INSNS_FLAGS2(ctx, ISA310);
uint32_t mask = 0x08 >> (a->bi & 0x03);
TCGCond cond = rev ? TCG_COND_EQ : TCG_COND_NE;
TCGv temp = tcg_temp_new();
tcg_gen_extu_i32_tl(temp, cpu_crf[a->bi >> 2]);
tcg_gen_andi_tl(temp, temp, mask);
tcg_gen_setcondi_tl(cond, cpu_gpr[a->rt], temp, 0);
if (neg) {
tcg_gen_neg_tl(cpu_gpr[a->rt], cpu_gpr[a->rt]);
}
tcg_temp_free(temp);
return true;
}
TRANS(SETBC, do_set_bool_cond, false, false)
TRANS(SETBCR, do_set_bool_cond, false, true)
TRANS(SETNBC, do_set_bool_cond, true, false)
TRANS(SETNBCR, do_set_bool_cond, true, true)