[gcc r15-7594] i386: Simplify PARALLEL RTX scan in ix86_find_all_reg_use

[Uros Bizjak via Gcc-cvs]

https://gcc.gnu.org/g:565d4e755498ad2b5ed55e368ef61eb9511cda3a

commit r15-7594-g565d4e755498ad2b5ed55e368ef61eb9511cda3a
Author: Uros Bizjak <ubiz...@gmail.com>
Date:   Mon Feb 17 20:47:14 2025 +0100

    i386: Simplify PARALLEL RTX scan in ix86_find_all_reg_use
    
    UNSPEC and UNSPEC_VOLATILE never store. Remove unnecessary checks and
    simplify RTX scan in ix86_find_all_reg_use to scan only for SET RTX
    in the PARALLEL.
    
    gcc/ChangeLog:
    
            * config/i386/i386.cc (ix86_find_all_reg_use):
            Scan only for SET RTX in PARALLEL.

Diff:
---
 gcc/config/i386/i386.cc | 28 +++-------------------------
 1 file changed, 3 insertions(+), 25 deletions(-)

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index fafd4a511a3c..560e6525b56b 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -8538,31 +8538,9 @@ ix86_find_all_reg_use (HARD_REG_SET &stack_slot_access,
       for (int i = 0; i < XVECLEN (pat, 0); i++)
        {
          rtx exp = XVECEXP (pat, 0, i);
-         switch (GET_CODE (exp))
-           {
-           case ASM_OPERANDS:
-           case CLOBBER:
-           case PREFETCH:
-           case USE:
-             break;
-           case UNSPEC:
-           case UNSPEC_VOLATILE:
-             for (int j = XVECLEN (exp, 0) - 1; j >= 0; j--)
-               {
-                 rtx x = XVECEXP (exp, 0, j);
-                 if (GET_CODE (x) == SET)
-                   ix86_find_all_reg_use_1 (x, stack_slot_access,
-                                            worklist);
-               }
-             break;
-           case SET:
-             ix86_find_all_reg_use_1 (exp, stack_slot_access,
-                                      worklist);
-             break;
-           default:
-             gcc_unreachable ();
-             break;
-           }
+
+         if (GET_CODE (exp) == SET)
+           ix86_find_all_reg_use_1 (exp, stack_slot_access, worklist);
        }
     }
 }