Hexagon (target/hexagon) add A6_vminub_RdP

Rdd32,Pe4 = vminub(Rtt32, Rss32)
    Vector min of bytes

Test cases in tests/tcg/hexagon/multi_result.c

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <1617930474-31979-21-git-send-email-tsimpson@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/hexagon/gen_tcg.h

@@ -237,6 +237,33 @@
         tcg_temp_free_i64(tmp); \
     } while (0)
 
+/*
+ * Compare each of the 8 unsigned bytes
+ * The minimum is placed in each byte of the destination.
+ * Each bit of the predicate is set true if the bit from the first operand
+ * is greater than the bit from the second operand.
+ * r5:4,p1 = vminub(r1:0, r3:2)
+ */
+#define fGEN_TCG_A6_vminub_RdP(SHORTCODE) \
+    do { \
+        TCGv left = tcg_temp_new(); \
+        TCGv right = tcg_temp_new(); \
+        TCGv tmp = tcg_temp_new(); \
+        tcg_gen_movi_tl(PeV, 0); \
+        tcg_gen_movi_i64(RddV, 0); \
+        for (int i = 0; i < 8; i++) { \
+            gen_get_byte_i64(left, i, RttV, false); \
+            gen_get_byte_i64(right, i, RssV, false); \
+            tcg_gen_setcond_tl(TCG_COND_GT, tmp, left, right); \
+            tcg_gen_deposit_tl(PeV, PeV, tmp, i, 1); \
+            tcg_gen_umin_tl(tmp, left, right); \
+            gen_set_byte_i64(i, RddV, tmp); \
+        } \
+        tcg_temp_free(left); \
+        tcg_temp_free(right); \
+        tcg_temp_free(tmp); \
+    } while (0)
+
 /* Floating point */
 #define fGEN_TCG_F2_conv_sf2df(SHORTCODE) \
     gen_helper_conv_sf2df(RddV, cpu_env, RsV)

target/hexagon/genptr.c

@@ -266,6 +266,28 @@ static inline void gen_write_ctrl_reg_pair(DisasContext *ctx, int reg_num,
     }
 }
 
+static TCGv gen_get_byte_i64(TCGv result, int N, TCGv_i64 src, bool sign)
+{
+    TCGv_i64 res64 = tcg_temp_new_i64();
+    if (sign) {
+        tcg_gen_sextract_i64(res64, src, N * 8, 8);
+    } else {
+        tcg_gen_extract_i64(res64, src, N * 8, 8);
+    }
+    tcg_gen_extrl_i64_i32(result, res64);
+    tcg_temp_free_i64(res64);
+
+    return result;
+}
+
+static void gen_set_byte_i64(int N, TCGv_i64 result, TCGv src)
+{
+    TCGv_i64 src64 = tcg_temp_new_i64();
+    tcg_gen_extu_i32_i64(src64, src);
+    tcg_gen_deposit_i64(result, result, src64, N * 8, 8);
+    tcg_temp_free_i64(src64);
+}
+
 static inline void gen_load_locked4u(TCGv dest, TCGv vaddr, int mem_index)
 {
     tcg_gen_qemu_ld32u(dest, vaddr, mem_index);

target/hexagon/imported/alu.idef

@@ -1259,6 +1259,16 @@ Q6INSN(A5_ACS,"Rxx32,Pe4=vacsh(Rss32,Rtt32)",ATTRIBS(),
         }
 })
 
+Q6INSN(A6_vminub_RdP,"Rdd32,Pe4=vminub(Rtt32,Rss32)",ATTRIBS(),
+"Vector minimum of bytes, records minimum and decision vector",
+{
+        fHIDE(int i;)
+        for (i = 0; i < 8; i++) {
+            fSETBIT(i, PeV,     (fGETUBYTE(i,RttV) > fGETUBYTE(i,RssV)));
+            fSETBYTE(i,RddV,fMIN(fGETUBYTE(i,RttV),fGETUBYTE(i,RssV)));
+        }
+})
+
 /**********************************************/
 /* Vector Min/Max                             */
 /**********************************************/

target/hexagon/imported/encode_pp.def

@@ -1018,6 +1018,7 @@ MPY_ENC(M7_dcmpyiwc_acc,     "1010","xxxxx","1","0","1","0","10")
 
 
 MPY_ENC(A5_ACS,              "1010","xxxxx","0","1","0","1","ee")
+MPY_ENC(A6_vminub_RdP,       "1010","ddddd","0","1","1","1","ee")
 /*
 */
 

tests/tcg/hexagon/multi_result.c

@@ -70,6 +70,21 @@ static long long vacsh(long long Rxx, long long Rss, long long Rtt,
   return result;
 }
 
+static long long vminub(long long Rtt, long long Rss,
+                        int *pred_result)
+{
+  long long result;
+  int predval;
+
+  asm volatile("%0,p0 = vminub(%2, %3)\n\t"
+               "%1 = p0\n\t"
+               : "=r"(result), "=r"(predval)
+               : "r"(Rtt), "r"(Rss)
+               : "p0");
+  *pred_result = predval;
+  return result;
+}
+
 int err;
 
 static void check_ll(long long val, long long expect)
@@ -155,11 +170,30 @@ static void test_vacsh()
     check(ovf_result, 0);
 }
 
+static void test_vminub()
+{
+    long long res64;
+    int pred_result;
+
+    res64 = vminub(0x0807060504030201LL,
+                   0x0102030405060708LL,
+                   &pred_result);
+    check_ll(res64, 0x0102030404030201LL);
+    check_p(pred_result, 0xf0);
+
+    res64 = vminub(0x0802060405030701LL,
+                   0x0107030504060208LL,
+                   &pred_result);
+    check_ll(res64, 0x0102030404030201LL);
+    check_p(pred_result, 0xaa);
+}
+
 int main()
 {
     test_sfrecipa();
     test_sfinvsqrta();
     test_vacsh();
+    test_vminub();
 
     puts(err ? "FAIL" : "PASS");
     return err;