Fix incorrect length for __builtin_bswap16

The bswaphi pattern generates 2 assembly instructions with a length
of 8 bytes. The bswaphi pattern missed the length attribute, as a
result the default of 8 bytes was assumed. This allowed the "8 byte"
bswaphi pattern to be scheduled into the delay slot of a branch
instruction where only a 4 byte instruction can be placed. This
patch addresses the problem.

2026-04-18  Michael Eager <eager@eagercon.com>

gcc/ChangeLog:
	PR target/103383
	* config/microblaze/microblaze.md: bswaphi2: (set_attr length 8)

gcc/testsuite/ChangeLog:
	PR target/103383
	* gcc.target/microblaze/isa/pr103383.c: New test.

Signed-off-by: Nagaraju Mekala <nmekala@xilix.com>
Signed-off-by: Gopi Kumar Bulusu <gopi@sankhya.com>
Signed-off-by: Michael J. Eager <eager@eagercon.com>

Author: Gopi Kumar Bulusu

gcc/config/microblaze/microblaze.md

@@ -369,6 +369,9 @@
         (bswap:SI (match_operand:SI 1 "register_operand" "r")))]
   "TARGET_REORDER"
   "swapb %0, %1"
+  [(set_attr "type"	"no_delay_arith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"4")]
 )
 
 (define_insn "bswaphi2"
@@ -377,6 +380,9 @@
   "TARGET_REORDER"
   "swapb %0, %1
    swaph %0, %0"
+  [(set_attr "type"	"no_delay_arith")
+   (set_attr "mode"	"SI")
+   (set_attr "length"	"8")]
 )
 
 ;;----------------------------------------------------------------

gcc/testsuite/gcc.target/microblaze/isa/pr103383.c

@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mcpu=v10.0 -mxl-barrel-shift -S" } */
+ 
+unsigned short t = 0x1234;
+
+extern unsigned short int g();
+
+int f()
+{
+  unsigned short s = t;
+
+/* { dg-final { scan-assembler-not "brlid\tr(\[0-9]\|\[1-2]\[0-9]\|3\[0-1]),g\n\[ \t\n\]*swap" } } */
+  if (__builtin_bswap16(s) != g()) {
+	  return -1;
+  }
+
+  return 0;
+}
+
+