Try to avoid conflicting with the outgoing function call arguments. Signed-off-by: Richard Henderson <r...@twiddle.net> --- tcg/s390/tcg-target.c | 23 +++++++++++++---------- 1 files changed, 13 insertions(+), 10 deletions(-)
diff --git a/tcg/s390/tcg-target.c b/tcg/s390/tcg-target.c index 95ea3c8..3944cb1 100644 --- a/tcg/s390/tcg-target.c +++ b/tcg/s390/tcg-target.c @@ -149,22 +149,25 @@ static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = { }; #endif +/* Since R6 is a potential argument register, choose it last of the + call-saved registers. Likewise prefer the call-clobbered registers + in reverse order to maximize the chance of avoiding the arguments. */ static const int tcg_target_reg_alloc_order[] = { - TCG_REG_R6, - TCG_REG_R7, - TCG_REG_R8, - TCG_REG_R9, - TCG_REG_R10, - TCG_REG_R11, - TCG_REG_R12, TCG_REG_R13, + TCG_REG_R12, + TCG_REG_R11, + TCG_REG_R10, + TCG_REG_R9, + TCG_REG_R8, + TCG_REG_R7, + TCG_REG_R6, TCG_REG_R14, TCG_REG_R0, TCG_REG_R1, - TCG_REG_R2, - TCG_REG_R3, - TCG_REG_R4, TCG_REG_R5, + TCG_REG_R4, + TCG_REG_R3, + TCG_REG_R2, }; static const int tcg_target_call_iarg_regs[] = { -- 1.7.0.1