[gcc r11-7974] Darwin : Fix out-of-bounds access to df_regs_ever_live.

[gcc r11-7974] Darwin : Fix out-of-bounds access to df_regs_ever_live.

[Iain D Sandoe]

https://gcc.gnu.org/g:89bc1d4e7cdd0b2d012050134ad1d464ec357f0b

commit r11-7974-g89bc1d4e7cdd0b2d012050134ad1d464ec357f0b
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sat Apr 3 10:07:48 2021 +0100

    Darwin : Fix out-of-bounds access to df_regs_ever_live.
    
    During changes made for LRA (or, perhaps, even before) we omitted
    a check that the current register we are working on is a hard reg
    before we tried to note its liveness.
    
    A stage 1 built with fsanitize=address catches this, as does any
    attempt to build master with clang and -std=c++11.
    
    gcc/ChangeLog:
    
            * config/darwin.c (machopic_legitimize_pic_address): Check
            that the current pic register is one of the hard reg set
            before setting liveness.

Diff:
---
 gcc/config/darwin.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/gcc/config/darwin.c b/gcc/config/darwin.c
index c1086a04700..5d173919ee0 100644
--- a/gcc/config/darwin.c
+++ b/gcc/config/darwin.c
@@ -907,7 +907,7 @@ machopic_legitimize_pic_address (rtx orig, machine_mode mode, rtx reg)
 		  pic = reg;
 		}
 
-	      if (lra_in_progress)
+	      if (lra_in_progress && HARD_REGISTER_P (pic))
 		df_set_regs_ever_live (REGNO (pic), true);
 	      pic_ref = gen_rtx_PLUS (Pmode, pic,
 				      machopic_gen_offset (XEXP (orig, 0)));
@@ -974,7 +974,8 @@ machopic_legitimize_pic_address (rtx orig, machine_mode mode, rtx reg)
 		      emit_move_insn (reg, pic);
 		      pic = reg;
 		    }
-		  if (lra_in_progress)
+
+		  if (lra_in_progress && HARD_REGISTER_P (pic))
 		    df_set_regs_ever_live (REGNO (pic), true);
 		  pic_ref = gen_rtx_PLUS (Pmode,
 					  pic,