From: Richard Henderson <richard.henderson@linaro.org>
Date: Wed, 7 Jun 2023 01:06:15 +0000 (-0700)
Subject: tcg/tci: Adjust call-clobbered regs for int128_t
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0cabaef3ed13697e2da0ceb18b3da9e21d0b4d83;p=qemu.git

tcg/tci: Adjust call-clobbered regs for int128_t

We require either 2 or 4 registers to hold int128_t.
Failure to do so results in a register allocation assert.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/tci/tcg-target.c.inc b/tcg/tci/tcg-target.c.inc
index 5b456e1277..0037f904f1 100644
--- a/tcg/tci/tcg-target.c.inc
+++ b/tcg/tci/tcg-target.c.inc
@@ -179,8 +179,6 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
 }
 
 static const int tcg_target_reg_alloc_order[] = {
-    TCG_REG_R2,
-    TCG_REG_R3,
     TCG_REG_R4,
     TCG_REG_R5,
     TCG_REG_R6,
@@ -193,6 +191,9 @@ static const int tcg_target_reg_alloc_order[] = {
     TCG_REG_R13,
     TCG_REG_R14,
     TCG_REG_R15,
+    /* Either 2 or 4 of these are call clobbered, so use them last. */
+    TCG_REG_R3,
+    TCG_REG_R2,
     TCG_REG_R1,
     TCG_REG_R0,
 };
@@ -934,11 +935,11 @@ static void tcg_target_init(TCGContext *s)
     /*
      * The interpreter "registers" are in the local stack frame and
      * cannot be clobbered by the called helper functions.  However,
-     * the interpreter assumes a 64-bit return value and assigns to
+     * the interpreter assumes a 128-bit return value and assigns to
      * the return value registers.
      */
     tcg_target_call_clobber_regs =
-        MAKE_64BIT_MASK(TCG_REG_R0, 64 / TCG_TARGET_REG_BITS);
+        MAKE_64BIT_MASK(TCG_REG_R0, 128 / TCG_TARGET_REG_BITS);
 
     s->reserved_regs = 0;
     tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP);