[PATCH] tcg: Increase width of temp_subindex

[Richard Henderson]

We need values 0-3 for TCG_TYPE_I128 on 32-bit hosts.

Cc: qemu-stable@nongnu.org
Fixes: 43eef72f4109 ("tcg: Add temp allocation for TCGv_i128")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2159
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

I feel certain that I made this change back when I introduced TCGv_i128.
I imagine that something went wrong with a rebase and it got lost.
Worse, we don't use temp_subindex often, and we usually handle i128
this value correctly.  It took a quirk of register allocation ordering
to make an invalid value in temp_subindex lead to a crash.

---
 include/tcg/tcg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index daf2a5bf9e..451f3fec41 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -412,7 +412,7 @@ typedef struct TCGTemp {
     unsigned int mem_coherent:1;
     unsigned int mem_allocated:1;
     unsigned int temp_allocated:1;
-    unsigned int temp_subindex:1;
+    unsigned int temp_subindex:2;
 
     int64_t val;
     struct TCGTemp *mem_base;
-- 
2.34.1