[gcc r14-216] [Committed] Correct zeroextendqihi2 insn length regression on xstormy16.

[gcc r14-216] [Committed] Correct zeroextendqihi2 insn length regression on xstormy16.

[Roger Sayle]

https://gcc.gnu.org/g:dee5cef280d6c6da92b56cc0dc2158761c266992

commit r14-216-gdee5cef280d6c6da92b56cc0dc2158761c266992
Author: Roger Sayle <roger@nextmovesoftware.com>
Date:   Tue Apr 25 12:04:52 2023 +0100

    [Committed] Correct zeroextendqihi2 insn length regression on xstormy16.
    
    My recent tweak to the zeroextendqihi2 pattern on xstormy16 incorrectly
    handled the case where the operand was a MEM.  MEM operands use a longer
    encoding than REG operands, and the incorrect instruction length resulted
    in assembler errors (as reported by Jeff Law).  This patch restores the
    original length resolving this regression.  Sorry for the inconvenience.
    Committed as obvious, after testing that a cross-compiler to xstormy16-elf
    builds from x86_64-pc-linux-gnu, and that gcc.c-torture/execute/memset-2.c
    no longer causes "operand out of range" issues in gas.  Committed as
    obvious.
    
    2023-04-25  Roger Sayle  <roger@nextmovesoftware.com>
    
    gcc/ChangeLog
            * config/stormy16/stormy16.md (zero_extendqihi2): Restore/fix
            length attribute for the first (memory operand) alternative.

Diff:
---
 gcc/config/stormy16/stormy16.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/stormy16/stormy16.md b/gcc/config/stormy16/stormy16.md
index fd525881881..9d92492c748 100644
--- a/gcc/config/stormy16/stormy16.md
+++ b/gcc/config/stormy16/stormy16.md
@@ -286,7 +286,7 @@
    shl %0,#8 | shr %0,#8"
   [(set_attr "psw_operand" "nop,nop,0")
    (set_attr_alternative "length"
-	     [(const_int 2)
+	     [(const_int 4)
 	      (const_int 2)
 	      (const_int 4)])])