[Qemu-devel] [PATCH for-next 02/15] tcg-ppc64: Add an LK argument to tcg_out_call

[Richard Henderson <rth@twiddle.net>]

This will enable the generation of tail-calls in a future patch.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 tcg/ppc64/tcg-target.c | 38 +++++++++++++++++++-------------------
 1 file changed, 19 insertions(+), 19 deletions(-)

diff --git a/tcg/ppc64/tcg-target.c b/tcg/ppc64/tcg-target.c
index 0e3147b..94960a3 100644
--- a/tcg/ppc64/tcg-target.c
+++ b/tcg/ppc64/tcg-target.c
@@ -702,30 +702,30 @@ static void tcg_out_b (TCGContext *s, int mask, tcg_target_long target)
     }
 }
 
-static void tcg_out_call (TCGContext *s, tcg_target_long arg, int const_arg)
+/* Make a call to a function.  LK = LK for a normal call, or 0 to avoid
+   setting the link register, making a tail call.  */
+static void tcg_out_call(TCGContext *s, tcg_target_long arg,
+                         int const_arg, int lk)
 {
 #ifdef __APPLE__
     if (const_arg) {
-        tcg_out_b (s, LK, arg);
-    }
-    else {
-        tcg_out32 (s, MTSPR | RS (arg) | LR);
-        tcg_out32 (s, BCLR | BO_ALWAYS | LK);
+        tcg_out_b(s, lk, arg);
+    } else {
+        tcg_out32(s, MTSPR | RS(arg) | CTR);
+        tcg_out32(s, BCCTR | BO_ALWAYS | lk);
     }
 #else
-    int reg;
-
+    TCGReg reg = arg;
     if (const_arg) {
-        reg = 2;
-        tcg_out_movi (s, TCG_TYPE_I64, reg, arg);
+        reg = TCG_REG_R2;
+        tcg_out_movi(s, TCG_TYPE_I64, reg, arg);
     }
-    else reg = arg;
 
-    tcg_out32 (s, LD | RT (0) | RA (reg));
-    tcg_out32 (s, MTSPR | RA (0) | CTR);
-    tcg_out32 (s, LD | RT (11) | RA (reg) | 16);
-    tcg_out32 (s, LD | RT (2) | RA (reg) | 8);
-    tcg_out32 (s, BCCTR | BO_ALWAYS | LK);
+    tcg_out32(s, LD | TAI(TCG_REG_R0, reg, 0));
+    tcg_out32(s, MTSPR | RA(TCG_REG_R0) | CTR);
+    tcg_out32(s, LD | TAI(TCG_REG_R11, reg, 16));
+    tcg_out32(s, LD | TAI(TCG_REG_R2, reg, 8));
+    tcg_out32(s, BCCTR | BO_ALWAYS | lk);
 #endif
 }
 
@@ -869,7 +869,7 @@ static void tcg_out_qemu_ld (TCGContext *s, const TCGArg *args, int opc)
     tcg_out_mov (s, TCG_TYPE_I64, ir++, addr_reg);
     tcg_out_movi (s, TCG_TYPE_I64, ir++, mem_index);
 
-    tcg_out_call (s, (tcg_target_long) qemu_ld_helpers[s_bits], 1);
+    tcg_out_call(s, (tcg_target_long)qemu_ld_helpers[s_bits], 1, LK);
 
     if (opc & 4) {
         insn = qemu_exts_opc[s_bits];
@@ -960,7 +960,7 @@ static void tcg_out_qemu_st (TCGContext *s, const TCGArg *args, int opc)
     tcg_out_rld (s, RLDICL, ir++, data_reg, 0, 64 - (1 << (3 + opc)));
     tcg_out_movi (s, TCG_TYPE_I64, ir++, mem_index);
 
-    tcg_out_call (s, (tcg_target_long) qemu_st_helpers[opc], 1);
+    tcg_out_call(s, (tcg_target_long)qemu_st_helpers[opc], 1, LK);
 
     label2_ptr = s->code_ptr;
     tcg_out32 (s, B);
@@ -1440,7 +1440,7 @@ static void tcg_out_op (TCGContext *s, TCGOpcode opc, const TCGArg *args,
         }
         break;
     case INDEX_op_call:
-        tcg_out_call (s, args[0], const_args[0]);
+        tcg_out_call(s, args[0], const_args[0], LK);
         break;
     case INDEX_op_movi_i32:
         tcg_out_movi (s, TCG_TYPE_I32, args[0], args[1]);
-- 
1.8.3.1