tcg: Add markup for output requires new register

This is the same concept as, and same markup as, the
early clobber markup in gcc.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/tcg/tcg.h b/tcg/tcg.h
index 5fd3733ed1..ebfcefda77 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -851,6 +851,7 @@ void tcg_dump_op_count(FILE *f, fprintf_function cpu_fprintf);
 
 #define TCG_CT_ALIAS  0x80
 #define TCG_CT_IALIAS 0x40
+#define TCG_CT_NEWREG 0x20 /* output requires a new register */
 #define TCG_CT_REG    0x01
 #define TCG_CT_CONST  0x02 /* any constant of register size */