[gcc r16-2389] [RISC-V] Fix wrong CFA during stack probe

[Andreas Schwab via Gcc-cvs]

https://gcc.gnu.org/g:b441d735c092f5d60c4a9c7167ed9153003d49fa

commit r16-2389-gb441d735c092f5d60c4a9c7167ed9153003d49fa
Author: Andreas Schwab <sch...@suse.de>
Date:   Wed Jul 16 14:48:51 2025 +0200

    [RISC-V] Fix wrong CFA during stack probe
    
    temp1 is used by the probe loop for the step size, but we need the final
    address of the stack after the loop which resides in temp2.
    
            PR target/121121
            * config/riscv/riscv.cc (riscv_allocate_and_probe_stack_space):
            Use temp2 instead of temp1 for the CFA note.

Diff:
---
 gcc/config/riscv/riscv.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index 6e630695b612..3324819864a0 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -9077,7 +9077,7 @@ riscv_allocate_and_probe_stack_space (rtx temp1, 
HOST_WIDE_INT size)
          /* We want the CFA independent of the stack pointer for the
             duration of the loop.  */
          add_reg_note (insn, REG_CFA_DEF_CFA,
-                       plus_constant (Pmode, temp1,
+                       plus_constant (Pmode, temp2,
                                       initial_cfa_offset + rounded_size));
          RTX_FRAME_RELATED_P (insn) = 1;
        }