tcg: Add output_pref to TCGOp

Allocate storage for, but do not yet fill in, per-opcode
preferences for the output operands.  Pass it in to the
register allocation routines for output operands.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/tcg/tcg.h b/tcg/tcg.h
index db2d91867f..c6721cc7a7 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -619,6 +619,9 @@ typedef struct TCGOp {
 
     /* Arguments for the opcode.  */
     TCGArg args[MAX_OPC_PARAM];
+
+    /* Register preferences for the output(s).  */
+    TCGRegSet output_pref[2];
 } TCGOp;
 
 #define TCGOP_CALLI(X)    (X)->param1