> Hi,
>
> This patch fixes nested PARALLEL in retval for isntrumented calls. Current
> possible call:
>
> (call_insn:TI 6 30 17 2 (set (parallel [
> (expr_list:REG_DEP_TRUE (parallel:TI [
> (expr_list:REG_DEP_TRUE (reg:DF 21 xmm0)
> (const_int 0 [0]))
> (expr_list:REG_DEP_TRUE (reg:DF 22 xmm1)
> (const_int 8 [0x8]))
> ])
> (const_int 0 [0]))
> (expr_list:REG_DEP_TRUE (reg:BND64 77 bnd0)
> (const_int 0 [0]))
> (expr_list:REG_DEP_TRUE (reg:BND64 78 bnd1)
> (const_int 0 [0]))
> ])
> (call/j (mem:QI (symbol_ref:DI ("test1") [flags 0x41] <function_decl
> 0x7f6f50e02ca8 test1.chkp>) [0 test1.chkp S1 A8])
> (const_int 0 [0]))) complex.c:11 670 {*call_value}
>
> Such construction causes DF analysis problems. This patch tranforms it to:
>
> (call_insn:TI 6 30 17 2 (set (parallel:TI [
> (expr_list:REG_DEP_TRUE (reg:DF 21 xmm0)
> (const_int 0 [0]))
> (expr_list:REG_DEP_TRUE (reg:DF 22 xmm1)
> (const_int 8 [0x8]))
> (expr_list:REG_DEP_TRUE (reg:BND64 77 bnd0)
> (const_int 0 [0]))
> (expr_list:REG_DEP_TRUE (reg:BND64 78 bnd1)
> (const_int 0 [0]))
> ])
> (call/j (mem:QI (symbol_ref:DI ("test1") [flags 0x41] <function_decl
> 0x7fb609bf7ca8 test1.chkp>) [0 test1.chkp S1 A8])
> (const_int 0 [0]))) complex.c:11 670 {*call_value}
Yep, nested parallels should not happen.
> 2015-04-02 Ilya Enkovich <ilya.enkov...@intel.com>
>
> * config/i386/i386.c (ix86_expand_call): Avoid nested
> PARALLEL in returned call value.
>
>
> diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> index 744642c..1d821cd 100644
> --- a/gcc/config/i386/i386.c
> +++ b/gcc/config/i386/i386.c
> @@ -25624,8 +25624,19 @@ ix86_expand_call (rtx retval, rtx fnaddr, rtx
> callarg1,
> {
> rtx b0 = gen_rtx_REG (BND64mode, FIRST_BND_REG);
> rtx b1 = gen_rtx_REG (BND64mode, FIRST_BND_REG + 1);
> - retval = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (3, retval, b0, b1));
> - chkp_put_regs_to_expr_list (retval);
> + if (GET_CODE (retval) == PARALLEL)
> + {
> + b0 = gen_rtx_EXPR_LIST (VOIDmode, b0, const0_rtx);
> + b1 = gen_rtx_EXPR_LIST (VOIDmode, b1, const0_rtx);
> + rtx par = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, b0, b1));
> + retval = chkp_join_splitted_slot (retval, par);
I do not understand this code. Isn't it just droping the original return value
constructing prallelcontaining only the BND_REGs?
Honza
