diff options
Diffstat (limited to 'docs/devel/tcg-ops.rst')
| -rw-r--r-- | docs/devel/tcg-ops.rst | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/devel/tcg-ops.rst b/docs/devel/tcg-ops.rst index 6608a29376..688984fd39 100644 --- a/docs/devel/tcg-ops.rst +++ b/docs/devel/tcg-ops.rst @@ -927,7 +927,9 @@ operation uses a constant input constraint which does not allow all constants, it must also accept registers in order to have a fallback. The constraint '``i``' is defined generically to accept any constant. The constraint '``r``' is not defined generically, but is consistently -used by each backend to indicate all registers. +used by each backend to indicate all registers. If ``TCG_REG_ZERO`` +is defined by the backend, the constraint '``z``' is defined generically +to map constant 0 to the hardware zero register. The movi_i32 and movi_i64 operations must accept any constants. |