[gcc r16-5487] libgcc: Pass x87 control word in the correct type

[Uros Bizjak]

https://gcc.gnu.org/g:d9b785ab9255fe16ee6d9e93034704112735cfb6

commit r16-5487-gd9b785ab9255fe16ee6d9e93034704112735cfb6
Author: LIU Hao <lh_mouse@126.com>
Date:   Tue Oct 14 14:46:46 2025 +0800

    libgcc: Pass x87 control word in the correct type
    
    The x87 control word should be passed as an `unsigned short`. Previous
    code passed `unsigned int`, and when building with `-masm=intel`,
    
       __asm__ __volatile__ ("fnstcw\t%0" : "=m" (_cw));
    
    could expand to `fnstcw DWORD PTR [esp+48]` and cause errors like
    
       {standard input}: Assembler messages:
       {standard input}:7137: Error: operand size mismatch for `fnstcw'
    
    libgcc/ChangeLog:
    
            PR target/122275
            * config/i386/32/dfp-machine.h (DFP_GET_ROUNDMODE): Change `_frnd_orig` to
            `unsigned short` for x87 control word.
            (DFP_SET_ROUNDMODE): Manipulate the x87 control word as `unsigned short`,
            and manipulate the MXCSR as `unsigned int`.
    
    Signed-off-by: LIU Hao <lh_mouse@126.com>

Diff:
---
 libgcc/config/i386/32/dfp-machine.h | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/libgcc/config/i386/32/dfp-machine.h b/libgcc/config/i386/32/dfp-machine.h
index ef8fa4f3600c..9b008eefafc9 100644
--- a/libgcc/config/i386/32/dfp-machine.h
+++ b/libgcc/config/i386/32/dfp-machine.h
@@ -1,7 +1,7 @@
 #ifndef _SOFT_FLOAT
 /* Get the rounding mode.  */
 #define DFP_GET_ROUNDMODE						\
-  unsigned int _frnd_orig;						\
+  unsigned short _frnd_orig;						\
   do									\
     {									\
       __asm__ __volatile__ ("fnstcw\t%0" : "=m" (_frnd_orig));		\
@@ -13,17 +13,18 @@
 #define DFP_SET_ROUNDMODE(round)					\
   do									\
     {									\
-      unsigned int _cw;							\
-      __asm__ __volatile__ ("fnstcw\t%0" : "=m" (_cw));			\
-      _cw &= ~FP_RND_MASK;						\
-      _cw |= round;							\
-      __asm__ __volatile__ ("fldcw\t%0" :: "m" (_cw));			\
+      unsigned short _fcw;						\
+      __asm__ __volatile__ ("fnstcw\t%0" : "=m" (_fcw));		\
+      _fcw &= ~FP_RND_MASK;						\
+      _fcw |= round;							\
+      __asm__ __volatile__ ("fldcw\t%0" :: "m" (_fcw));			\
       if (__builtin_cpu_supports ("sse"))				\
 	{								\
-	  __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (_cw));		\
-	  _cw &= ~0x6000;						\
-	  _cw |= round << 3;						\
-	  __asm__ __volatile__ ("%vldmxcsr\t%0" :: "m" (_cw));		\
+	  unsigned int _xcw;						\
+	  __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (_xcw));		\
+	  _xcw &= ~0x6000;						\
+	  _xcw |= round << 3;						\
+	  __asm__ __volatile__ ("%vldmxcsr\t%0" :: "m" (_xcw));		\
 	}								\
     }									\
   while (0);