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target/ppc: implement cdtbcd 

Implements the Convert Declets To Binary Coded Decimal instruction.
Since libdecnumber doesn't expose the methods for direct conversion
(decDigitsFromDPD, DPD2BCD, etc), a positive decimal32 with zero
exponent is used as an intermediate value to convert the declets.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Signed-off-by: Víctor Colombo <victor.colombo@eldorado.org.br>
Message-Id: <20220629162904.105060-12-victor.colombo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Matheus Ferst 2022-06-29 13:29:04 -03:00 committed by Daniel Henrique Barboza
parent 38d3690bda
commit 6b924d4afc
4 changed files with 35 additions and 0 deletions
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26
target/ppc/dfp_helper.c
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@ -1392,6 +1392,32 @@ DFP_HELPER_SHIFT(DSCLIQ, 128, 1)
DFP_HELPER_SHIFT(DSCRI, 64, 0)
DFP_HELPER_SHIFT(DSCRIQ, 128, 0)
target_ulong helper_CDTBCD(target_ulong s)
{
uint64_t res = 0;
uint32_t dec32, declets;
uint8_t bcd[6];
int i, w, sh;
decNumber a;
for (w = 1; w >= 0; w--) {
res <<= 32;
declets = extract64(s, 32 * w, 20);
if (declets) {
/* decimal32 with zero exponent and word "w" declets */
dec32 = (0x225ULL << 20) | declets;
decimal32ToNumber((decimal32 *)&dec32, &a);
decNumberGetBCD(&a, bcd);
for (i = 0; i < a.digits; i++) {
sh = 4 * (a.digits - 1 - i);
res |= (uint64_t)bcd[i] << sh;
}
}
}
return res;
}
target_ulong helper_CBCDTD(target_ulong s)
{
uint64_t res = 0;

1
target/ppc/helper.h
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@ -54,6 +54,7 @@ DEF_HELPER_3(sraw, tl, env, tl, tl)
DEF_HELPER_FLAGS_2(CFUGED, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(PDEPD, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_2(PEXTD, TCG_CALL_NO_RWG_SE, i64, i64, i64)
DEF_HELPER_FLAGS_1(CDTBCD, TCG_CALL_NO_RWG_SE, tl, tl)
DEF_HELPER_FLAGS_1(CBCDTD, TCG_CALL_NO_RWG_SE, tl, tl)
#if defined(TARGET_PPC64)
DEF_HELPER_FLAGS_2(cmpeqb, TCG_CALL_NO_RWG_SE, i32, tl, tl)

1
target/ppc/insn32.decode
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@ -317,6 +317,7 @@ PEXTD 011111 ..... ..... ..... 0010111100 - @X
## BCD Assist
ADDG6S 011111 ..... ..... ..... - 001001010 - @X
CDTBCD 011111 ..... ..... ----- 0100011010 - @X_sa
CBCDTD 011111 ..... ..... ----- 0100111010 - @X_sa
### Float-Point Load Instructions

7
target/ppc/translate/fixedpoint-impl.c.inc
View File

@ -530,6 +530,13 @@ static bool trans_ADDG6S(DisasContext *ctx, arg_X *a)
return true;
}
static bool trans_CDTBCD(DisasContext *ctx, arg_X_sa *a)
{
REQUIRE_INSNS_FLAGS2(ctx, BCDA_ISA206);
gen_helper_CDTBCD(cpu_gpr[a->ra], cpu_gpr[a->rs]);
return true;
}
static bool trans_CBCDTD(DisasContext *ctx, arg_X_sa *a)
{
REQUIRE_INSNS_FLAGS2(ctx, BCDA_ISA206);