Fix PR target/13557

[Eric Botcazou]

This is a deviation from the psABI on SPARC64.  The compiler passes the 
structure

struct sf {
   float f;
};

in %f1, while the ABI mandates %f0.  The structure is sent with SFmode to the 
FUNCTION_ARG macro, which fools it into thinking that it sees a bare float.


Fixed by reordering the cases in the FUNCTION_ARG macro.  The patch was 
bootstrapped/regtested on sparc64-sun-solaris2.9 (except Ada and libgcj) and 
compat-regtested against the Sun ONE Studio 8 compiler.  It fixes:

FAIL: gcc.dg/compat/struct-by-value-5 c_compat_x_tst.o-c_compat_y_alt.o 
execute
FAIL: gcc.dg/compat/struct-by-value-5 c_compat_x_alt.o-c_compat_y_tst.o 
execute

in the latter testsuite.  Applied to mainline and 3.4 branch (the 3.4 branch 
already contains ABI fixes which makes it incompatible with 3.3.x).


2004-01-20  Eric Botcazou  <ebotcazou@libertysurf.fr>

	PR target/13557
	* config/sparc/sparc.c (function_arg): Reorder the cases.


-- 
Eric Botcazou
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