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From: "aagarwa at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/100799] Stackoverflow in optimized code on PPC
Date: Fri, 22 Mar 2024 07:45:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100799

--- Comment #34 from Ajit Kumar Agarwal <aagarwa at gcc dot gnu.org> ---
Sent the patch for review.

Here is the patch:
PATCH] rs6000: Stackoverflow in optimized code on PPC (PR100799)

When using FlexiBLAS with OpenBLAS we noticed corruption of
the parameters passed to OpenBLAS functions. FlexiBLAS
basically provides a BLAS interface where each function
is a stub that forwards the arguments to a real BLAS lib,
like OpenBLAS.

Fixes the corruption of caller frame checking number of
arguments is less than equal to GP_ARG_NUM_REG (8)
excluding hidden unused DECLS.

2024-03-22  Ajit Kumar Agarwal  <aagarwa1@linux.ibm.com>

gcc/ChangeLog:

        PR rtk-optimization/100799
        * config/rs600/rs600-calls.cc (rs6000_function_arg): Don't
        generate parameter save area if number of arguments passed
        less than equal to GP_ARG_NUM_REG (8) excluding hidden
        paramter.
        * function.cc (assign_parms_initialize_all): Check for hidden
        parameter in fortran code and set the flag hidden_string_length
        and actual paramter passed excluding hidden unused DECLS.
        * function.h: Add new field hidden_string_length and
        actual_parm_length in function structure.=