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[PATCH] Fix compat failures on SPARC64


Several struct-by-value compat tests segfault at runtime on SPARC64. The 
diagnostic is straightforward: the SPARC-specific va_list handling code 
applies 16-byte alignment to 16-byte+ structures passed by value. Now the 
64-bit ABI requires such structures to always be passed by reference, so we 
end up over-aligning a pointer! And given that the regular call handling 
code does the right thing in this matter...

Bootstrapped/regtested (c,c++,objc,f77 mainline) on sparc64-sun-solaris2.9, 
all struct-by-value compat tests now passing.

I'd have commited it as obvious, but I wanted to know whether it is 
appropriate for the 3.3 branch as well.

Eric Botcazou

2003-06-16  Eric Botcazou  <>

	* config/sparc/sparc.c (sparc_va_arg): Don't align 16-byte+ structures.
Index: config/sparc/sparc.c
RCS file: /cvs/gcc/gcc/gcc/config/sparc/sparc.c,v
retrieving revision 1.244
diff -u -p -r1.244 sparc.c
--- config/sparc/sparc.c	13 Jun 2003 03:56:10 -0000	1.244
+++ config/sparc/sparc.c	16 Jun 2003 22:19:57 -0000
@@ -5328,6 +5328,7 @@ sparc_va_arg (valist, type)
 	      indirect = 1;
 	      size = rsize = UNITS_PER_WORD;
+	      align = 0;
 	  /* SPARC v9 ABI states that structures up to 8 bytes in size are
 	     given one 8 byte slot.  */

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