[gcc r16-9531] i386: Fix some minor issues with BT patterns

https://gcc.gnu.org/g:d3ee0199d95ecea85c6116a9e10a9728506f419e

commit r16-9531-gd3ee0199d95ecea85c6116a9e10a9728506f419e
Author: Uros Bizjak <[email protected]>
Date:   Wed Aug 12 21:13:15 2026 +0200

    i386: Fix some minor issues with BT patterns
    
    Relax register constraint on operand 1 of *bt<mode> from "q" to "r"
    so it is no longer restricted to the legacy byte-addressable register
    class.  Also remove the unneeded "r,m" constraints on operand 0
    of *bt<SWI48:mode>_mask pre-reload splitter, keeping only the
    nonimmediate_operand predicate.
    
    gcc/ChangeLog:
    
            * config/i386/i386.md (*bt<mode>): Change operand 1 constraint
            from "q<S>,<S>" to "r<S>,<S>".
            (*bt<SWI48:mode>_mask): Remove constraints from operand 0.
    
    (cherry picked from commit f296bb38423fb786f20d213f9f87bf2c7ce14b63)

Diff:
---
 gcc/config/i386/i386.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index 8407af948fc4..fe40cd25b7d7 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -19548,7 +19548,7 @@
 	  (zero_extract:SWI48
 	    (match_operand:SWI48 0 "nonimmediate_operand" "r,m")
 	    (const_int 1)
-	    (match_operand:QI 1 "nonmemory_operand" "q<S>,<S>"))))]
+	    (match_operand:QI 1 "nonmemory_operand" "r<S>,<S>"))))]
   ""
 {
   switch (get_attr_mode (insn))
@@ -19577,7 +19577,7 @@
         (compare:CCC
 	  (const_int 0)
           (zero_extract:SWI48
-            (match_operand:SWI48 0 "nonimmediate_operand" "r,m")
+            (match_operand:SWI48 0 "nonimmediate_operand")
             (const_int 1)
 	    (subreg:QI
 	      (and:SWI248