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[PULL,2/5] tcg/tci: Adjust call-clobbered regs for int128_t

Message ID 20230607154054.625513-3-richard.henderson@linaro.org
State Accepted
Commit 0cabaef3ed13697e2da0ceb18b3da9e21d0b4d83
Headers show
Series [PULL,1/5] tcg/tci: Adjust passing of MemOpIdx | expand

Commit Message

Richard Henderson June 7, 2023, 3:40 p.m. UTC 
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>
---
 tcg/tci/tcg-target.c.inc | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
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Patch

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);