[Qemu-devel] [PULL 18/42] arm/translate-a64: add FP16 F[A]C[EQ/GE/GT] to simd_three_reg_same_fp16

[Peter Maydell <peter.maydell@linaro.org>]

From: Alex Bennée <alex.bennee@linaro.org>

These use the generic float16_compare functionality which in turn uses
the common float_compare code from the softfloat re-factor.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180227143852.11175-11-alex.bennee@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/helper-a64.h    |  5 +++++
 target/arm/helper-a64.c    | 49 ++++++++++++++++++++++++++++++++++++++++++++++
 target/arm/translate-a64.c | 15 ++++++++++++++
 3 files changed, 69 insertions(+)

diff --git a/target/arm/helper-a64.h b/target/arm/helper-a64.h
index bac9469426..1cf40bda5e 100644
--- a/target/arm/helper-a64.h
+++ b/target/arm/helper-a64.h
@@ -56,3 +56,8 @@ DEF_HELPER_3(advsimd_addh, f16, f16, f16, ptr)
 DEF_HELPER_3(advsimd_subh, f16, f16, f16, ptr)
 DEF_HELPER_3(advsimd_mulh, f16, f16, f16, ptr)
 DEF_HELPER_3(advsimd_divh, f16, f16, f16, ptr)
+DEF_HELPER_3(advsimd_ceq_f16, i32, f16, f16, ptr)
+DEF_HELPER_3(advsimd_cge_f16, i32, f16, f16, ptr)
+DEF_HELPER_3(advsimd_cgt_f16, i32, f16, f16, ptr)
+DEF_HELPER_3(advsimd_acge_f16, i32, f16, f16, ptr)
+DEF_HELPER_3(advsimd_acgt_f16, i32, f16, f16, ptr)
diff --git a/target/arm/helper-a64.c b/target/arm/helper-a64.c
index 931a6d3c34..d0b284fec4 100644
--- a/target/arm/helper-a64.c
+++ b/target/arm/helper-a64.c
@@ -594,3 +594,52 @@ ADVSIMD_HALFOP(min)
 ADVSIMD_HALFOP(max)
 ADVSIMD_HALFOP(minnum)
 ADVSIMD_HALFOP(maxnum)
+
+/*
+ * Floating point comparisons produce an integer result. Softfloat
+ * routines return float_relation types which we convert to the 0/-1
+ * Neon requires.
+ */
+
+#define ADVSIMD_CMPRES(test) (test) ? 0xffff : 0
+
+uint32_t HELPER(advsimd_ceq_f16)(float16 a, float16 b, void *fpstp)
+{
+    float_status *fpst = fpstp;
+    int compare = float16_compare_quiet(a, b, fpst);
+    return ADVSIMD_CMPRES(compare == float_relation_equal);
+}
+
+uint32_t HELPER(advsimd_cge_f16)(float16 a, float16 b, void *fpstp)
+{
+    float_status *fpst = fpstp;
+    int compare = float16_compare(a, b, fpst);
+    return ADVSIMD_CMPRES(compare == float_relation_greater ||
+                          compare == float_relation_equal);
+}
+
+uint32_t HELPER(advsimd_cgt_f16)(float16 a, float16 b, void *fpstp)
+{
+    float_status *fpst = fpstp;
+    int compare = float16_compare(a, b, fpst);
+    return ADVSIMD_CMPRES(compare == float_relation_greater);
+}
+
+uint32_t HELPER(advsimd_acge_f16)(float16 a, float16 b, void *fpstp)
+{
+    float_status *fpst = fpstp;
+    float16 f0 = float16_abs(a);
+    float16 f1 = float16_abs(b);
+    int compare = float16_compare(f0, f1, fpst);
+    return ADVSIMD_CMPRES(compare == float_relation_greater ||
+                          compare == float_relation_equal);
+}
+
+uint32_t HELPER(advsimd_acgt_f16)(float16 a, float16 b, void *fpstp)
+{
+    float_status *fpst = fpstp;
+    float16 f0 = float16_abs(a);
+    float16 f1 = float16_abs(b);
+    int compare = float16_compare(f0, f1, fpst);
+    return ADVSIMD_CMPRES(compare == float_relation_greater);
+}
diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index f8770ee1e9..fb74dc1c45 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -10289,6 +10289,9 @@ static void disas_simd_three_reg_same_fp16(DisasContext *s, uint32_t insn)
         case 0x2: /* FADD */
             gen_helper_advsimd_addh(tcg_res, tcg_op1, tcg_op2, fpst);
             break;
+        case 0x4: /* FCMEQ */
+            gen_helper_advsimd_ceq_f16(tcg_res, tcg_op1, tcg_op2, fpst);
+            break;
         case 0x6: /* FMAX */
             gen_helper_advsimd_maxh(tcg_res, tcg_op1, tcg_op2, fpst);
             break;
@@ -10304,6 +10307,12 @@ static void disas_simd_three_reg_same_fp16(DisasContext *s, uint32_t insn)
         case 0x13: /* FMUL */
             gen_helper_advsimd_mulh(tcg_res, tcg_op1, tcg_op2, fpst);
             break;
+        case 0x14: /* FCMGE */
+            gen_helper_advsimd_cge_f16(tcg_res, tcg_op1, tcg_op2, fpst);
+            break;
+        case 0x15: /* FACGE */
+            gen_helper_advsimd_acge_f16(tcg_res, tcg_op1, tcg_op2, fpst);
+            break;
         case 0x17: /* FDIV */
             gen_helper_advsimd_divh(tcg_res, tcg_op1, tcg_op2, fpst);
             break;
@@ -10311,6 +10320,12 @@ static void disas_simd_three_reg_same_fp16(DisasContext *s, uint32_t insn)
             gen_helper_advsimd_subh(tcg_res, tcg_op1, tcg_op2, fpst);
             tcg_gen_andi_i32(tcg_res, tcg_res, 0x7fff);
             break;
+        case 0x1c: /* FCMGT */
+            gen_helper_advsimd_cgt_f16(tcg_res, tcg_op1, tcg_op2, fpst);
+            break;
+        case 0x1d: /* FACGT */
+            gen_helper_advsimd_acgt_f16(tcg_res, tcg_op1, tcg_op2, fpst);
+            break;
         default:
             fprintf(stderr, "%s: insn %#04x, fpop %#2x @ %#" PRIx64 "\n",
                     __func__, insn, fpopcode, s->pc);
-- 
2.16.2