target/arm: Implement FPCR.AH semantics for FMINP and FMAXP

Implement the FPCR.AH semantics for the pairwise floating
point minimum/maximum insns FMINP and FMAXP.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 45 insertions, 4 deletions

diff --git a/target/arm/tcg/helper-sve.h b/target/arm/tcg/helper-sve.h
index f1b4606..8349752 100644
--- a/target/arm/tcg/helper-sve.h
+++ b/target/arm/tcg/helper-sve.h
@@ -986,6 +986,20 @@ DEF_HELPER_FLAGS_5(gvec_ah_fmin_s, TCG_CALL_NO_RWG,
 DEF_HELPER_FLAGS_5(gvec_ah_fmin_d, TCG_CALL_NO_RWG,
                    void, ptr, ptr, ptr, fpst, i32)
 
+DEF_HELPER_FLAGS_5(gvec_ah_fmaxp_h, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, fpst, i32)
+DEF_HELPER_FLAGS_5(gvec_ah_fmaxp_s, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, fpst, i32)
+DEF_HELPER_FLAGS_5(gvec_ah_fmaxp_d, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, fpst, i32)
+
+DEF_HELPER_FLAGS_5(gvec_ah_fminp_h, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, fpst, i32)
+DEF_HELPER_FLAGS_5(gvec_ah_fminp_s, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, fpst, i32)
+DEF_HELPER_FLAGS_5(gvec_ah_fminp_d, TCG_CALL_NO_RWG,
+                   void, ptr, ptr, ptr, fpst, i32)
+
 DEF_HELPER_FLAGS_4(sve_faddv_h, TCG_CALL_NO_RWG,
                    i64, ptr, ptr, fpst, i32)
 DEF_HELPER_FLAGS_4(sve_faddv_s, TCG_CALL_NO_RWG,
diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 4ae0426..02701b1 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -5765,14 +5765,24 @@ static gen_helper_gvec_3_ptr * const f_vector_fmaxp[3] = {
     gen_helper_gvec_fmaxp_s,
     gen_helper_gvec_fmaxp_d,
 };
-TRANS(FMAXP_v, do_fp3_vector, a, 0, f_vector_fmaxp)
+static gen_helper_gvec_3_ptr * const f_vector_ah_fmaxp[3] = {
+    gen_helper_gvec_ah_fmaxp_h,
+    gen_helper_gvec_ah_fmaxp_s,
+    gen_helper_gvec_ah_fmaxp_d,
+};
+TRANS(FMAXP_v, do_fp3_vector_2fn, a, 0, f_vector_fmaxp, f_vector_ah_fmaxp)
 
 static gen_helper_gvec_3_ptr * const f_vector_fminp[3] = {
     gen_helper_gvec_fminp_h,
     gen_helper_gvec_fminp_s,
     gen_helper_gvec_fminp_d,
 };
-TRANS(FMINP_v, do_fp3_vector, a, 0, f_vector_fminp)
+static gen_helper_gvec_3_ptr * const f_vector_ah_fminp[3] = {
+    gen_helper_gvec_ah_fminp_h,
+    gen_helper_gvec_ah_fminp_s,
+    gen_helper_gvec_ah_fminp_d,
+};
+TRANS(FMINP_v, do_fp3_vector_2fn, a, 0, f_vector_fminp, f_vector_ah_fminp)
 
 static gen_helper_gvec_3_ptr * const f_vector_fmaxnmp[3] = {
     gen_helper_gvec_fmaxnump_h,
@@ -6764,9 +6774,16 @@ static bool do_fp3_scalar_pair(DisasContext *s, arg_rr_e *a, const FPScalar *f)
     return true;
 }
 
+static bool do_fp3_scalar_pair_2fn(DisasContext *s, arg_rr_e *a,
+                                   const FPScalar *fnormal,
+                                   const FPScalar *fah)
+{
+    return do_fp3_scalar_pair(s, a, s->fpcr_ah ? fah : fnormal);
+}
+
 TRANS(FADDP_s, do_fp3_scalar_pair, a, &f_scalar_fadd)
-TRANS(FMAXP_s, do_fp3_scalar_pair, a, &f_scalar_fmax)
-TRANS(FMINP_s, do_fp3_scalar_pair, a, &f_scalar_fmin)
+TRANS(FMAXP_s, do_fp3_scalar_pair_2fn, a, &f_scalar_fmax, &f_scalar_fmax_ah)
+TRANS(FMINP_s, do_fp3_scalar_pair_2fn, a, &f_scalar_fmin, &f_scalar_fmin_ah)
 TRANS(FMAXNMP_s, do_fp3_scalar_pair, a, &f_scalar_fmaxnm)
 TRANS(FMINNMP_s, do_fp3_scalar_pair, a, &f_scalar_fminnm)
 
diff --git a/target/arm/tcg/vec_helper.c b/target/arm/tcg/vec_helper.c
index 9f77aa6..61e6e54 100644
--- a/target/arm/tcg/vec_helper.c
+++ b/target/arm/tcg/vec_helper.c
@@ -2444,6 +2444,16 @@ DO_3OP_PAIR(gvec_fminnump_h, float16_minnum, float16, H2)
 DO_3OP_PAIR(gvec_fminnump_s, float32_minnum, float32, H4)
 DO_3OP_PAIR(gvec_fminnump_d, float64_minnum, float64, )
 
+#ifdef TARGET_AARCH64
+DO_3OP_PAIR(gvec_ah_fmaxp_h, helper_vfp_ah_maxh, float16, H2)
+DO_3OP_PAIR(gvec_ah_fmaxp_s, helper_vfp_ah_maxs, float32, H4)
+DO_3OP_PAIR(gvec_ah_fmaxp_d, helper_vfp_ah_maxd, float64, )
+
+DO_3OP_PAIR(gvec_ah_fminp_h, helper_vfp_ah_minh, float16, H2)
+DO_3OP_PAIR(gvec_ah_fminp_s, helper_vfp_ah_mins, float32, H4)
+DO_3OP_PAIR(gvec_ah_fminp_d, helper_vfp_ah_mind, float64, )
+#endif
+
 #undef DO_3OP_PAIR
 
 #define DO_3OP_PAIR(NAME, FUNC, TYPE, H) \