[PULL 23/27] target/ppc: Move floating-point move instructions to decodetree.

[Harsh Prateek Bora <harshpb@linux.ibm.com>]

From: Chinmay Rath <rathc@linux.ibm.com>

Move below instructions to decodetree specification:

	f{mr, neg, abs, nabs}		: X-form

The changes were verified by validating that the tcg ops generated by
those instructions remain the same, which were captured with the '-d
in_asm,op' flag.

Signed-off-by: Chinmay Rath <rathc@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Link: https://lore.kernel.org/r/20250619095840.369351-4-rathc@linux.ibm.com
Message-ID: <20250619095840.369351-4-rathc@linux.ibm.com>
---
 target/ppc/insn32.decode           |  7 +++
 target/ppc/translate/fp-impl.c.inc | 80 ++++++++----------------------
 target/ppc/translate/fp-ops.c.inc  |  4 --
 3 files changed, 28 insertions(+), 63 deletions(-)

diff --git a/target/ppc/insn32.decode b/target/ppc/insn32.decode
index d446ec534d..063d5726cb 100644
--- a/target/ppc/insn32.decode
+++ b/target/ppc/insn32.decode
@@ -530,6 +530,13 @@ STFDU           110111 ..... ...... ...............     @D
 STFDX           011111 ..... ...... .... 1011010111 -   @X
 STFDUX          011111 ..... ...... .... 1011110111 -   @X
 
+### Floating-Point Move Instructions
+
+FMR             111111 ..... ----- ..... 0001001000 .   @X_tb_rc
+FNEG            111111 ..... ----- ..... 0000101000 .   @X_tb_rc
+FABS            111111 ..... ----- ..... 0100001000 .   @X_tb_rc
+FNABS           111111 ..... ----- ..... 0010001000 .   @X_tb_rc
+
 ### Floating-Point Arithmetic Instructions
 
 FADD            111111 ..... ..... ..... ----- 10101 .  @A_tab
diff --git a/target/ppc/translate/fp-impl.c.inc b/target/ppc/translate/fp-impl.c.inc
index 4e18d350c0..2843f71122 100644
--- a/target/ppc/translate/fp-impl.c.inc
+++ b/target/ppc/translate/fp-impl.c.inc
@@ -280,82 +280,44 @@ TRANS(FCMPU, do_helper_cmp, gen_helper_FCMPU);
 TRANS(FCMPO, do_helper_cmp, gen_helper_FCMPO);
 
 /***                         Floating-point move                           ***/
-/* fabs */
-/* XXX: beware that fabs never checks for NaNs nor update FPSCR */
-static void gen_fabs(DisasContext *ctx)
-{
-    TCGv_i64 t0;
-    TCGv_i64 t1;
-    if (unlikely(!ctx->fpu_enabled)) {
-        gen_exception(ctx, POWERPC_EXCP_FPU);
-        return;
-    }
-    t0 = tcg_temp_new_i64();
-    t1 = tcg_temp_new_i64();
-    get_fpr(t0, rB(ctx->opcode));
-    tcg_gen_andi_i64(t1, t0, ~(1ULL << 63));
-    set_fpr(rD(ctx->opcode), t1);
-    if (unlikely(Rc(ctx->opcode))) {
-        gen_set_cr1_from_fpscr(ctx);
-    }
-}
 
 /* fmr  - fmr. */
 /* XXX: beware that fmr never checks for NaNs nor update FPSCR */
-static void gen_fmr(DisasContext *ctx)
+static bool trans_FMR(DisasContext *ctx, arg_FMR *a)
 {
     TCGv_i64 t0;
-    if (unlikely(!ctx->fpu_enabled)) {
-        gen_exception(ctx, POWERPC_EXCP_FPU);
-        return;
-    }
+    REQUIRE_INSNS_FLAGS(ctx, FLOAT);
+    REQUIRE_FPU(ctx);
     t0 = tcg_temp_new_i64();
-    get_fpr(t0, rB(ctx->opcode));
-    set_fpr(rD(ctx->opcode), t0);
-    if (unlikely(Rc(ctx->opcode))) {
+    get_fpr(t0, a->rb);
+    set_fpr(a->rt, t0);
+    if (unlikely(a->rc)) {
         gen_set_cr1_from_fpscr(ctx);
     }
+    return true;
 }
 
-/* fnabs */
-/* XXX: beware that fnabs never checks for NaNs nor update FPSCR */
-static void gen_fnabs(DisasContext *ctx)
+/* XXX: beware that f{neg, abs, nabs} never checks for NaNs nor update FPSCR */
+static bool do_move_b(DisasContext *ctx, arg_X_tb_rc *a, int64_t val,
+                      void (*tcg_op)(TCGv_i64, TCGv_i64, int64_t))
 {
-    TCGv_i64 t0;
-    TCGv_i64 t1;
-    if (unlikely(!ctx->fpu_enabled)) {
-        gen_exception(ctx, POWERPC_EXCP_FPU);
-        return;
-    }
+    TCGv_i64 t0, t1;
+    REQUIRE_INSNS_FLAGS(ctx, FLOAT);
+    REQUIRE_FPU(ctx);
     t0 = tcg_temp_new_i64();
     t1 = tcg_temp_new_i64();
-    get_fpr(t0, rB(ctx->opcode));
-    tcg_gen_ori_i64(t1, t0, 1ULL << 63);
-    set_fpr(rD(ctx->opcode), t1);
-    if (unlikely(Rc(ctx->opcode))) {
+    get_fpr(t0, a->rb);
+    tcg_op(t1, t0, val);
+    set_fpr(a->rt, t1);
+    if (unlikely(a->rc)) {
         gen_set_cr1_from_fpscr(ctx);
     }
+    return true;
 }
 
-/* fneg */
-/* XXX: beware that fneg never checks for NaNs nor update FPSCR */
-static void gen_fneg(DisasContext *ctx)
-{
-    TCGv_i64 t0;
-    TCGv_i64 t1;
-    if (unlikely(!ctx->fpu_enabled)) {
-        gen_exception(ctx, POWERPC_EXCP_FPU);
-        return;
-    }
-    t0 = tcg_temp_new_i64();
-    t1 = tcg_temp_new_i64();
-    get_fpr(t0, rB(ctx->opcode));
-    tcg_gen_xori_i64(t1, t0, 1ULL << 63);
-    set_fpr(rD(ctx->opcode), t1);
-    if (unlikely(Rc(ctx->opcode))) {
-        gen_set_cr1_from_fpscr(ctx);
-    }
-}
+TRANS(FNEG, do_move_b, 1ULL << 63, tcg_gen_xori_i64);
+TRANS(FABS, do_move_b, ~(1ULL << 63), tcg_gen_andi_i64);
+TRANS(FNABS, do_move_b, 1ULL << 63, tcg_gen_ori_i64);
 
 /* fcpsgn: PowerPC 2.05 specification */
 /* XXX: beware that fcpsgn never checks for NaNs nor update FPSCR */
diff --git a/target/ppc/translate/fp-ops.c.inc b/target/ppc/translate/fp-ops.c.inc
index 502453da35..5053cb135c 100644
--- a/target/ppc/translate/fp-ops.c.inc
+++ b/target/ppc/translate/fp-ops.c.inc
@@ -10,10 +10,6 @@ GEN_STXF(stfiw, st32fiw, 0x17, 0x1E, PPC_FLOAT_STFIWX)
 GEN_HANDLER_E(stfdepx, 0x1F, 0x1F, 0x16, 0x00000001, PPC_NONE, PPC2_BOOKE206),
 GEN_HANDLER_E(stfdpx, 0x1F, 0x17, 0x1C, 0x00200001, PPC_NONE, PPC2_ISA205),
 
-GEN_HANDLER(fabs, 0x3F, 0x08, 0x08, 0x001F0000, PPC_FLOAT),
-GEN_HANDLER(fmr, 0x3F, 0x08, 0x02, 0x001F0000, PPC_FLOAT),
-GEN_HANDLER(fnabs, 0x3F, 0x08, 0x04, 0x001F0000, PPC_FLOAT),
-GEN_HANDLER(fneg, 0x3F, 0x08, 0x01, 0x001F0000, PPC_FLOAT),
 GEN_HANDLER_E(fcpsgn, 0x3F, 0x08, 0x00, 0x00000000, PPC_NONE, PPC2_ISA205),
 GEN_HANDLER_E(fmrgew, 0x3F, 0x06, 0x1E, 0x00000001, PPC_NONE, PPC2_VSX207),
 GEN_HANDLER_E(fmrgow, 0x3F, 0x06, 0x1A, 0x00000001, PPC_NONE, PPC2_VSX207),
-- 
2.43.5