target/ppc: Implement DCFFIXQQ

Implement the following PowerISA v3.1 instruction:
dcffixqq: DFP Convert From Fixed Quadword Quad

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211029192417.400707-5-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/target/ppc/dfp_helper.c b/target/ppc/dfp_helper.c
index 07341a69f5204f5808d0089e0e83e9aa1439462c..6b837c445033c18ff3630ff149e9c8810127063c 100644 (file)
--- a/target/ppc/dfp_helper.c
+++ b/target/ppc/dfp_helper.c
@@ -970,6 +970,18 @@ static void CFFIX_PPs(struct PPC_DFP *dfp)
 DFP_HELPER_CFFIX(dcffix, 64)
 DFP_HELPER_CFFIX(dcffixq, 128)
 
+void helper_DCFFIXQQ(CPUPPCState *env, ppc_fprp_t *t, ppc_avr_t *b)
+{
+    struct PPC_DFP dfp;
+
+    dfp_prepare_decimal128(&dfp, NULL, NULL, env);
+    decNumberFromInt128(&dfp.t, (uint64_t)b->VsrD(1), (int64_t)b->VsrD(0));
+    dfp_finalize_decimal128(&dfp);
+    CFFIX_PPs(&dfp);
+
+    set_dfp128(t, &dfp.vt);
+}
+
 #define DFP_HELPER_CTFIX(op, size)                                            \
 void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b)              \
 {                                                                             \

diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 808c5823821a2fce26d5aa818fe2f06ef7b4570e..8e4f67ceacf310fc9c25e6255f6175cc235b524b 100644 (file)
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -736,6 +736,7 @@ DEF_HELPER_3(drsp, void, env, fprp, fprp)
 DEF_HELPER_3(drdpq, void, env, fprp, fprp)
 DEF_HELPER_3(dcffix, void, env, fprp, fprp)
 DEF_HELPER_3(dcffixq, void, env, fprp, fprp)
+DEF_HELPER_3(DCFFIXQQ, void, env, fprp, avr)
 DEF_HELPER_3(dctfix, void, env, fprp, fprp)
 DEF_HELPER_3(dctfixq, void, env, fprp, fprp)
 DEF_HELPER_4(ddedpd, void, env, fprp, fprp, i32)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index e13f920702bb9a71d3322fd16f40a237599dbd3c..36586dfa59374d31c6bbe79d6c337c54f350af51 100644 (file)
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -50,6 +50,10 @@
 &X_bfl          bf l:bool ra rb
 @X_bfl          ...... bf:3 - l:1 ra:5 rb:5 ..........- &X_bfl
 
+&X_frtp_vrb     frtp vrb
+%x_frtp         22:4 !function=times_2
+@X_frtp_vrb     ...... ....0 ..... vrb:5 .......... .           &X_frtp_vrb frtp=%x_frtp
+
 ### Fixed-Point Load Instructions
 
 LBZ             100010 ..... ..... ................     @D
@@ -160,6 +164,10 @@ SETBCR          011111 ..... ..... ----- 0110100000 -   @X_bi
 SETNBC          011111 ..... ..... ----- 0111000000 -   @X_bi
 SETNBCR         011111 ..... ..... ----- 0111100000 -   @X_bi
 
+### Decimal Floating-Point Conversion Instructions
+
+DCFFIXQQ        111111 ..... 00000 ..... 1111100010 -   @X_frtp_vrb
+
 ## Vector Bit Manipulation Instruction
 
 VCFUGED         000100 ..... ..... ..... 10101001101    @VX

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index d4e72affa608c9f1fe62a18c95397151630acd42..486339d4022bdd3c2e623beaeff6be6da0d2a373 100644 (file)
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -7305,6 +7305,11 @@ static inline void set_avr64(int regno, TCGv_i64 src, bool high)
 /*
  * Helpers for decodetree used by !function for decoding arguments.
  */
+static int times_2(DisasContext *ctx, int x)
+{
+    return x * 2;
+}
+
 static int times_4(DisasContext *ctx, int x)
 {
     return x * 4;

diff --git a/target/ppc/translate/dfp-impl.c.inc b/target/ppc/translate/dfp-impl.c.inc
index 6c556dc2e14f29e93f2e02c0fd8dc43fbc5d5ac1..d5b66567a69c055a288ca2a8ad0b39265a632ecd 100644 (file)
--- a/target/ppc/translate/dfp-impl.c.inc
+++ b/target/ppc/translate/dfp-impl.c.inc
@@ -230,3 +230,20 @@ GEN_DFP_T_FPR_I32_Rc(dscriq, rA, DCM)
 #undef GEN_DFP_T_A_B_I32_Rc
 #undef GEN_DFP_T_B_Rc
 #undef GEN_DFP_T_FPR_I32_Rc
+
+static bool trans_DCFFIXQQ(DisasContext *ctx, arg_DCFFIXQQ *a)
+{
+    TCGv_ptr rt, rb;
+
+    REQUIRE_INSNS_FLAGS2(ctx, DFP);
+    REQUIRE_FPU(ctx);
+    REQUIRE_VECTOR(ctx);
+
+    rt = gen_fprp_ptr(a->frtp);
+    rb = gen_avr_ptr(a->vrb);
+    gen_helper_DCFFIXQQ(cpu_env, rt, rb);
+    tcg_temp_free_ptr(rt);
+    tcg_temp_free_ptr(rb);
+
+    return true;
+}