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Fix struct ret in variadic fct with ARM hardfloat

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The procedure calling standard for ARM architecture mandate the use of
the base standard for variadic function. Therefore, hgen float aggregate
must be returned via stack when greater than 4 bytes and via core
registers else in case of variadic function.

This patch improve gfunc_sret() to take into account whether the
function is variadic or not and make use of gfunc_sret() return value to
determine whether to pass a structure via stack in gfunc_prolog(). It
also take advantage of knowing if a function is variadic or not move
float result value from VFP register to core register in gfunc_epilog().
This commit is contained in:
Thomas Preud'homme
2014-01-06 22:27:39 +08:00
parent bcc1904f9c
commit 8efaa71190
7 changed files with 35 additions and 23 deletions
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tcc.h
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@ -1176,6 +1176,7 @@ ST_DATA int const_wanted; /* true if constant wanted */
ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
ST_DATA int global_expr; /* true if compound literals must be allocated globally (used during initializers parsing */
ST_DATA CType func_vt; /* current function return type (used by return instruction) */
ST_DATA int func_var; /* true if current function is variadic */
ST_DATA int func_vc;
ST_DATA int last_line_num, last_ind, func_ind; /* debug last line number and pc */
ST_DATA char *funcname;
@ -1288,7 +1289,7 @@ ST_FUNC void gsym_addr(int t, int a);
ST_FUNC void gsym(int t);
ST_FUNC void load(int r, SValue *sv);
ST_FUNC void store(int r, SValue *v);
ST_FUNC int gfunc_sret(CType *vt, CType *ret, int *align);
ST_FUNC int gfunc_sret(CType *vt, int variadic, CType *ret, int *align);
ST_FUNC void gfunc_call(int nb_args);
ST_FUNC void gfunc_prolog(CType *func_type);
ST_FUNC void gfunc_epilog(void);