[Qemu-devel] [PATCH v3 10/27] tcg-ppc64: Improve constant add and sub ops.

[Richard Henderson <rth@twiddle.net>]

Use SUBFIC to implement subtraction with constant op1.  Improve constant
addition -- previously we'd emit useless addis with 0.  Use new constraints
to force the driver to pull full 64-bit constants into a register.

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/ppc64/tcg-target.c | 117 ++++++++++++++++++++++++++++++-------------------
 1 file changed, 72 insertions(+), 45 deletions(-)

diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c
index 0e4826d..d12fd61 100644
--- a/tcg/ppc64/tcg-target.c
+++ b/tcg/ppc64/tcg-target.c
@@ -329,6 +329,7 @@ static int tcg_target_const_match (tcg_target_long val,
 #define MULLI  OPCD(  7)
 #define CMPLI  OPCD( 10)
 #define CMPI   OPCD( 11)
+#define SUBFIC OPCD( 8)
 
 #define LWZU   OPCD( 33)
 #define STWU   OPCD( 37)
@@ -988,32 +989,6 @@ static void tcg_out_st (TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1,
         tcg_out_ldsta (s, arg, arg1, arg2, STD, STDX);
 }
 
-static void ppc_addi32(TCGContext *s, TCGReg rt, TCGReg ra, tcg_target_long si)
-{
-    if (!si && rt == ra)
-        return;
-
-    if (si == (int16_t) si)
-        tcg_out32(s, ADDI | TAI(rt, ra, si));
-    else {
-        uint16_t h = ((si >> 16) & 0xffff) + ((uint16_t) si >> 15);
-        tcg_out32(s, ADDIS | TAI(rt, ra, h));
-        tcg_out32(s, ADDI | TAI(rt, rt, si));
-    }
-}
-
-static void ppc_addi64(TCGContext *s, TCGReg rt, TCGReg ra, tcg_target_long si)
-{
-    /* XXX: suboptimal */
-    if (si == (int16_t) si
-        || ((((uint64_t) si >> 31) == 0) && (si & 0x8000) == 0))
-        ppc_addi32 (s, rt, ra, si);
-    else {
-        tcg_out_movi (s, TCG_TYPE_I64, 0, si);
-        tcg_out32(s, ADD | TAB(rt, ra, 0));
-    }
-}
-
 static void tcg_out_cmp (TCGContext *s, int cond, TCGArg arg1, TCGArg arg2,
                          int const_arg2, int cr, int arch64)
 {
@@ -1226,6 +1201,7 @@ void ppc_tb_set_jmp_target (unsigned long jmp_addr, unsigned long addr)
 static void tcg_out_op (TCGContext *s, TCGOpcode opc, const TCGArg *args,
                         const int *const_args)
 {
+    TCGArg a0, a1, a2;
     int c;
 
     switch (opc) {
@@ -1314,16 +1290,37 @@ static void tcg_out_op (TCGContext *s, TCGOpcode opc, const TCGArg *args,
         break;
 
     case INDEX_op_add_i32:
-        if (const_args[2])
-            ppc_addi32 (s, args[0], args[1], args[2]);
-        else
-            tcg_out32 (s, ADD | TAB (args[0], args[1], args[2]));
+        a0 = args[0], a1 = args[1], a2 = args[2];
+        if (const_args[2]) {
+            int32_t l, h;
+        do_addi_32:
+            l = (int16_t)a2;
+            h = a2 - l;
+            if (h) {
+                tcg_out32(s, ADDIS | TAI(a0, a1, h >> 16));
+                a1 = a0;
+            }
+            if (l || a0 != a1) {
+                tcg_out32(s, ADDI | TAI(a0, a1, l));
+            }
+        } else {
+            tcg_out32(s, ADD | TAB(a0, a1, a2));
+        }
         break;
     case INDEX_op_sub_i32:
-        if (const_args[2])
-            ppc_addi32 (s, args[0], args[1], -args[2]);
-        else
-            tcg_out32 (s, SUBF | TAB (args[0], args[2], args[1]));
+        a0 = args[0], a1 = args[1], a2 = args[2];
+        if (const_args[1]) {
+            if (const_args[2]) {
+                tcg_out_movi(s, TCG_TYPE_I32, a0, a1 - a2);
+            } else {
+                tcg_out32(s, SUBFIC | TAI(a0, a2, a1));
+            }
+        } else if (const_args[2]) {
+            a2 = -a2;
+            goto do_addi_32;
+        } else {
+            tcg_out32(s, SUBF | TAB(a0, a2, a1));
+        }
         break;
 
     case INDEX_op_and_i64:
@@ -1453,16 +1450,46 @@ static void tcg_out_op (TCGContext *s, TCGOpcode opc, const TCGArg *args,
         break;
 
     case INDEX_op_add_i64:
-        if (const_args[2])
-            ppc_addi64 (s, args[0], args[1], args[2]);
-        else
-            tcg_out32 (s, ADD | TAB (args[0], args[1], args[2]));
+        a0 = args[0], a1 = args[1], a2 = args[2];
+        if (const_args[2]) {
+            int32_t l0, h1, h2;
+        do_addi_64:
+            /* We can always split any 32-bit constant into
+               3 sign-extending pieces.  */
+            l0 = (int16_t)a2;
+            a2 -= l0;
+            h1 = ((int64_t)a2 > 0 && (int32_t)a2 < 0 ? 0x40000000 : 0);
+            h2 = a2 - h1;
+
+            if (h2) {
+                tcg_out32(s, ADDIS | TAI(a0, a1, h2 >> 16));
+                a1 = a0;
+            }
+            if (h1) {
+                tcg_out32(s, ADDIS | TAI(a0, a1, h1 >> 16));
+                a1 = a0;
+            }
+            if (l0 || a0 != a1) {
+                tcg_out32(s, ADDI | TAI(a0, a1, l0));
+            }
+        } else {
+            tcg_out32(s, ADD | TAB(a0, a1, a2));
+        }
         break;
     case INDEX_op_sub_i64:
-        if (const_args[2])
-            ppc_addi64 (s, args[0], args[1], -args[2]);
-        else
-            tcg_out32 (s, SUBF | TAB (args[0], args[2], args[1]));
+        a0 = args[0], a1 = args[1], a2 = args[2];
+        if (const_args[1]) {
+            if (const_args[2]) {
+                tcg_out_movi(s, TCG_TYPE_I64, a0, a1 - a2);
+            } else {
+                tcg_out32(s, SUBFIC | TAI(a0, a2, a1));
+            }
+        } else if (const_args[2]) {
+            a2 = -a2;
+            goto do_addi_64;
+        } else {
+            tcg_out32(s, SUBF | TAB(a0, a2, a1));
+        }
         break;
 
     case INDEX_op_shl_i64:
@@ -1613,7 +1640,7 @@ static const TCGTargetOpDef ppc_op_defs[] = {
     { INDEX_op_divu_i32, { "r", "r", "r" } },
     { INDEX_op_rem_i32, { "r", "r", "r" } },
     { INDEX_op_remu_i32, { "r", "r", "r" } },
-    { INDEX_op_sub_i32, { "r", "r", "ri" } },
+    { INDEX_op_sub_i32, { "r", "rI", "ri" } },
     { INDEX_op_and_i32, { "r", "r", "ri" } },
     { INDEX_op_or_i32, { "r", "r", "ri" } },
     { INDEX_op_xor_i32, { "r", "r", "ri" } },
@@ -1628,8 +1655,8 @@ static const TCGTargetOpDef ppc_op_defs[] = {
     { INDEX_op_neg_i32, { "r", "r" } },
     { INDEX_op_not_i32, { "r", "r" } },
 
-    { INDEX_op_add_i64, { "r", "r", "ri" } },
-    { INDEX_op_sub_i64, { "r", "r", "ri" } },
+    { INDEX_op_add_i64, { "r", "r", "rTU" } },
+    { INDEX_op_sub_i64, { "r", "rI", "rTU" } },
     { INDEX_op_and_i64, { "r", "r", "rU" } },
     { INDEX_op_or_i64, { "r", "r", "rU" } },
     { INDEX_op_xor_i64, { "r", "r", "rU" } },
-- 
1.8.1.4