tcg/sparc64: Implement negsetcond_*

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

tcg/sparc64/tcg-target.c.inc

@@ -720,7 +720,7 @@ static void tcg_out_movcond_i64(TCGContext *s, TCGCond cond, TCGReg ret,
 }
 
 static void tcg_out_setcond_i32(TCGContext *s, TCGCond cond, TCGReg ret,
-                                TCGReg c1, int32_t c2, int c2const)
+                                TCGReg c1, int32_t c2, int c2const, bool neg)
 {
     /* For 32-bit comparisons, we can play games with ADDC/SUBC.  */
     switch (cond) {
@@ -760,22 +760,34 @@ static void tcg_out_setcond_i32(TCGContext *s, TCGCond cond, TCGReg ret,
     default:
         tcg_out_cmp(s, c1, c2, c2const);
         tcg_out_movi_s13(s, ret, 0);
-        tcg_out_movcc(s, cond, MOVCC_ICC, ret, 1, 1);
+        tcg_out_movcc(s, cond, MOVCC_ICC, ret, neg ? -1 : 1, 1);
         return;
     }
 
     tcg_out_cmp(s, c1, c2, c2const);
     if (cond == TCG_COND_LTU) {
-        tcg_out_arithi(s, ret, TCG_REG_G0, 0, ARITH_ADDC);
+        if (neg) {
+            /* 0 - 0 - C = -C = (C ? -1 : 0) */
+            tcg_out_arithi(s, ret, TCG_REG_G0, 0, ARITH_SUBC);
+        } else {
+            /* 0 + 0 + C =  C = (C ? 1 : 0) */
+            tcg_out_arithi(s, ret, TCG_REG_G0, 0, ARITH_ADDC);
+        }
     } else {
-        tcg_out_arithi(s, ret, TCG_REG_G0, -1, ARITH_SUBC);
+        if (neg) {
+            /* 0 + -1 + C = C - 1 = (C ? 0 : -1) */
+            tcg_out_arithi(s, ret, TCG_REG_G0, -1, ARITH_ADDC);
+        } else {
+            /* 0 - -1 - C = 1 - C = (C ? 0 : 1) */
+            tcg_out_arithi(s, ret, TCG_REG_G0, -1, ARITH_SUBC);
+        }
     }
 }
 
 static void tcg_out_setcond_i64(TCGContext *s, TCGCond cond, TCGReg ret,
-                                TCGReg c1, int32_t c2, int c2const)
+                                TCGReg c1, int32_t c2, int c2const, bool neg)
 {
-    if (use_vis3_instructions) {
+    if (use_vis3_instructions && !neg) {
         switch (cond) {
         case TCG_COND_NE:
             if (c2 != 0) {
@@ -796,11 +808,11 @@ static void tcg_out_setcond_i64(TCGContext *s, TCGCond cond, TCGReg ret,
        if the input does not overlap the output.  */
     if (c2 == 0 && !is_unsigned_cond(cond) && c1 != ret) {
         tcg_out_movi_s13(s, ret, 0);
-        tcg_out_movr(s, cond, ret, c1, 1, 1);
+        tcg_out_movr(s, cond, ret, c1, neg ? -1 : 1, 1);
     } else {
         tcg_out_cmp(s, c1, c2, c2const);
         tcg_out_movi_s13(s, ret, 0);
-        tcg_out_movcc(s, cond, MOVCC_XCC, ret, 1, 1);
+        tcg_out_movcc(s, cond, MOVCC_XCC, ret, neg ? -1 : 1, 1);
     }
 }
 
@@ -1355,7 +1367,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
         tcg_out_brcond_i32(s, a2, a0, a1, const_args[1], arg_label(args[3]));
         break;
     case INDEX_op_setcond_i32:
-        tcg_out_setcond_i32(s, args[3], a0, a1, a2, c2);
+        tcg_out_setcond_i32(s, args[3], a0, a1, a2, c2, false);
+        break;
+    case INDEX_op_negsetcond_i32:
+        tcg_out_setcond_i32(s, args[3], a0, a1, a2, c2, true);
         break;
     case INDEX_op_movcond_i32:
         tcg_out_movcond_i32(s, args[5], a0, a1, a2, c2, args[3], const_args[3]);
@@ -1437,7 +1452,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
         tcg_out_brcond_i64(s, a2, a0, a1, const_args[1], arg_label(args[3]));
         break;
     case INDEX_op_setcond_i64:
-        tcg_out_setcond_i64(s, args[3], a0, a1, a2, c2);
+        tcg_out_setcond_i64(s, args[3], a0, a1, a2, c2, false);
+        break;
+    case INDEX_op_negsetcond_i64:
+        tcg_out_setcond_i64(s, args[3], a0, a1, a2, c2, true);
         break;
     case INDEX_op_movcond_i64:
         tcg_out_movcond_i64(s, args[5], a0, a1, a2, c2, args[3], const_args[3]);
@@ -1564,6 +1582,8 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
     case INDEX_op_sar_i64:
     case INDEX_op_setcond_i32:
     case INDEX_op_setcond_i64:
+    case INDEX_op_negsetcond_i32:
+    case INDEX_op_negsetcond_i64:
         return C_O1_I2(r, rZ, rJ);
 
     case INDEX_op_brcond_i32:

tcg/sparc64/tcg-target.h

@@ -106,7 +106,7 @@ extern bool use_vis3_instructions;
 #define TCG_TARGET_HAS_sextract_i32     0
 #define TCG_TARGET_HAS_extract2_i32     0
 #define TCG_TARGET_HAS_movcond_i32      1
-#define TCG_TARGET_HAS_negsetcond_i32   0
+#define TCG_TARGET_HAS_negsetcond_i32   1
 #define TCG_TARGET_HAS_add2_i32         1
 #define TCG_TARGET_HAS_sub2_i32         1
 #define TCG_TARGET_HAS_mulu2_i32        1
@@ -143,7 +143,7 @@ extern bool use_vis3_instructions;
 #define TCG_TARGET_HAS_sextract_i64     0
 #define TCG_TARGET_HAS_extract2_i64     0
 #define TCG_TARGET_HAS_movcond_i64      1
-#define TCG_TARGET_HAS_negsetcond_i64   0
+#define TCG_TARGET_HAS_negsetcond_i64   1
 #define TCG_TARGET_HAS_add2_i64         1
 #define TCG_TARGET_HAS_sub2_i64         1
 #define TCG_TARGET_HAS_mulu2_i64        0