target/ppc: Add helper for fmuls

Use float64r32_mul.  Fixes a double-rounding issue with performing
the compuation in float64 and then rounding afterward.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211119160502.17432-32-richard.henderson@linaro.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

diff --git a/target/ppc/fpu_helper.c b/target/ppc/fpu_helper.c
index c36cf05d80980fa29610bf43c7cae1ec3081fbef..4acc557c088abc2c28bc300ef62afd5102f67851 100644 (file)
--- a/target/ppc/fpu_helper.c
+++ b/target/ppc/fpu_helper.c
@@ -581,6 +581,18 @@ float64 helper_fmul(CPUPPCState *env, float64 arg1, float64 arg2)
     return ret;
 }
 
+/* fmuls - fmuls. */
+float64 helper_fmuls(CPUPPCState *env, float64 arg1, float64 arg2)
+{
+    float64 ret = float64r32_mul(arg1, arg2, &env->fp_status);
+    int flags = get_float_exception_flags(&env->fp_status);
+
+    if (unlikely(flags & float_flag_invalid)) {
+        float_invalid_op_mul(env, flags, 1, GETPC());
+    }
+    return ret;
+}
+
 static void float_invalid_op_div(CPUPPCState *env, int flags,
                                  bool set_fprc, uintptr_t retaddr)
 {

diff --git a/target/ppc/helper.h b/target/ppc/helper.h
index 2b80c2f22835dfa1fa298df619de0b2b328f3493..f70a3aefcbf454649319718b3110e68c986628a9 100644 (file)
--- a/target/ppc/helper.h
+++ b/target/ppc/helper.h
@@ -98,6 +98,7 @@ DEF_HELPER_3(fadds, f64, env, f64, f64)
 DEF_HELPER_3(fsub, f64, env, f64, f64)
 DEF_HELPER_3(fsubs, f64, env, f64, f64)
 DEF_HELPER_3(fmul, f64, env, f64, f64)
+DEF_HELPER_3(fmuls, f64, env, f64, f64)
 DEF_HELPER_3(fdiv, f64, env, f64, f64)
 DEF_HELPER_3(fdivs, f64, env, f64, f64)
 DEF_HELPER_4(fmadd, i64, env, i64, i64, i64)

diff --git a/target/ppc/translate/fp-impl.c.inc b/target/ppc/translate/fp-impl.c.inc
index b84097544f621e3fa1fb4cfa9cb835319f7a6584..bf56e35cb68610d2bdabd93fd311b55647542c0b 100644 (file)
--- a/target/ppc/translate/fp-impl.c.inc
+++ b/target/ppc/translate/fp-impl.c.inc
@@ -100,7 +100,7 @@ static void gen_f##name(DisasContext *ctx)                                    \
 _GEN_FLOAT_AB(name, 0x3F, op2, inval, set_fprf, type);                        \
 _GEN_FLOAT_AB(name##s, 0x3B, op2, inval, set_fprf, type);
 
-#define _GEN_FLOAT_AC(name, op, op1, op2, inval, isfloat, set_fprf, type)     \
+#define _GEN_FLOAT_AC(name, op1, op2, inval, set_fprf, type)                  \
 static void gen_f##name(DisasContext *ctx)                                    \
 {                                                                             \
     TCGv_i64 t0;                                                              \
@@ -116,10 +116,7 @@ static void gen_f##name(DisasContext *ctx)                                    \
     gen_reset_fpstatus();                                                     \
     get_fpr(t0, rA(ctx->opcode));                                             \
     get_fpr(t1, rC(ctx->opcode));                                             \
-    gen_helper_f##op(t2, cpu_env, t0, t1);                                    \
-    if (isfloat) {                                                            \
-        gen_helper_frsp(t2, cpu_env, t2);                                     \
-    }                                                                         \
+    gen_helper_f##name(t2, cpu_env, t0, t1);                                  \
     set_fpr(rD(ctx->opcode), t2);                                             \
     if (set_fprf) {                                                           \
         gen_compute_fprf_float64(t2);                                         \
@@ -132,8 +129,8 @@ static void gen_f##name(DisasContext *ctx)                                    \
     tcg_temp_free_i64(t2);                                                    \
 }
 #define GEN_FLOAT_AC(name, op2, inval, set_fprf, type)                        \
-_GEN_FLOAT_AC(name, name, 0x3F, op2, inval, 0, set_fprf, type);               \
-_GEN_FLOAT_AC(name##s, name, 0x3B, op2, inval, 1, set_fprf, type);
+_GEN_FLOAT_AC(name, 0x3F, op2, inval, set_fprf, type);                        \
+_GEN_FLOAT_AC(name##s, 0x3B, op2, inval, set_fprf, type);
 
 #define GEN_FLOAT_B(name, op2, op3, set_fprf, type)                           \
 static void gen_f##name(DisasContext *ctx)                                    \