diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2021-01-28 14:54:16 -1000 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2021-02-05 10:24:14 -1000 |
| commit | 187f44d9da0ca8ac08451f03f62b259080596570 (patch) | |
| tree | 690efddf00e1b64d7b373d78c55ef37728317142 /tcg/tci/tcg-target.h | |
| parent | f6ff97ab565d4aa779ae3e07e8c5f13e7495a005 (diff) | |
tcg/tci: Restrict TCG_TARGET_NB_REGS to 16
As noted in several comments, 8 regs is not enough for 32-bit
to perform calls, as currently implemented. Shortly, we will
rearrange the encoding which will make 32 regs impossible.
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'tcg/tci/tcg-target.h')
| -rw-r--r-- | tcg/tci/tcg-target.h | 32 |
1 files changed, 5 insertions, 27 deletions
diff --git a/tcg/tci/tcg-target.h b/tcg/tci/tcg-target.h index 7fc349a3de..8f7ed676fc 100644 --- a/tcg/tci/tcg-target.h +++ b/tcg/tci/tcg-target.h @@ -133,11 +133,8 @@ #define TCG_TARGET_HAS_mulu2_i32 1 #endif /* TCG_TARGET_REG_BITS == 64 */ -/* Number of registers available. - For 32 bit hosts, we need more than 8 registers (call arguments). */ -/* #define TCG_TARGET_NB_REGS 8 */ +/* Number of registers available. */ #define TCG_TARGET_NB_REGS 16 -/* #define TCG_TARGET_NB_REGS 32 */ /* List of registers which are used by TCG. */ typedef enum { @@ -149,7 +146,6 @@ typedef enum { TCG_REG_R5, TCG_REG_R6, TCG_REG_R7, -#if TCG_TARGET_NB_REGS >= 16 TCG_REG_R8, TCG_REG_R9, TCG_REG_R10, @@ -158,33 +154,15 @@ typedef enum { TCG_REG_R13, TCG_REG_R14, TCG_REG_R15, -#if TCG_TARGET_NB_REGS >= 32 - TCG_REG_R16, - TCG_REG_R17, - TCG_REG_R18, - TCG_REG_R19, - TCG_REG_R20, - TCG_REG_R21, - TCG_REG_R22, - TCG_REG_R23, - TCG_REG_R24, - TCG_REG_R25, - TCG_REG_R26, - TCG_REG_R27, - TCG_REG_R28, - TCG_REG_R29, - TCG_REG_R30, - TCG_REG_R31, -#endif -#endif + + TCG_AREG0 = TCG_REG_R14, + TCG_REG_CALL_STACK = TCG_REG_R15, + /* Special value UINT8_MAX is used by TCI to encode constant values. */ TCG_CONST = UINT8_MAX } TCGReg; -#define TCG_AREG0 (TCG_TARGET_NB_REGS - 2) - /* Used for function call generation. */ -#define TCG_REG_CALL_STACK (TCG_TARGET_NB_REGS - 1) #define TCG_TARGET_CALL_STACK_OFFSET 0 #define TCG_TARGET_STACK_ALIGN 16 |