tcg: Introduce INDEX_op_qemu_st8_i32

Enable this on i386 to restrict the set of input registers
for an 8-bit store, as required by the architecture.  This
removes the last use of scratch registers for user-only mode.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/tcg/tcg.c b/tcg/tcg.c
index ebb9466..95aacc8 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1427,6 +1427,9 @@ bool tcg_op_supported(TCGOpcode op)
     case INDEX_op_qemu_st_i64:
         return true;
 
+    case INDEX_op_qemu_st8_i32:
+        return TCG_TARGET_HAS_qemu_st8_i32;
+
     case INDEX_op_goto_ptr:
         return TCG_TARGET_HAS_goto_ptr;
 
@@ -2087,6 +2090,7 @@ static void tcg_dump_ops(TCGContext *s, bool have_prefs)
                 break;
             case INDEX_op_qemu_ld_i32:
             case INDEX_op_qemu_st_i32:
+            case INDEX_op_qemu_st8_i32:
             case INDEX_op_qemu_ld_i64:
             case INDEX_op_qemu_st_i64:
                 {