diff options
Diffstat (limited to 'gcc/config/i386/i386.c')
| -rw-r--r-- | gcc/config/i386/i386.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index 883f226b968..5bb5494e27f 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -22698,6 +22698,7 @@ x86_this_parameter (tree function) { tree type = TREE_TYPE (function); bool aggr = aggregate_value_p (TREE_TYPE (type), type) != 0; + int nregs; if (TARGET_64BIT) { @@ -22710,11 +22711,25 @@ x86_this_parameter (tree function) return gen_rtx_REG (DImode, parm_regs[aggr]); } - if (ix86_function_regparm (type, function) > 0 && !stdarg_p (type)) + nregs = ix86_function_regparm (type, function); + + if (nregs > 0 && !stdarg_p (type)) { - int regno = AX_REG; + int regno; + if (lookup_attribute ("fastcall", TYPE_ATTRIBUTES (type))) - regno = CX_REG; + regno = aggr ? DX_REG : CX_REG; + else + { + regno = AX_REG; + if (aggr) + { + regno = DX_REG; + if (nregs == 1) + return gen_rtx_MEM (SImode, + plus_constant (stack_pointer_rtx, 4)); + } + } return gen_rtx_REG (SImode, regno); } |