For whatever the reason, x86 CallingConv::Fast (i.e. fastcc) was not passing scalar arguments in registers. This patch defines a new fastcc CC which is slightly different from the FastCall CC. In addition to passing integer arguments in ECX and EDX, it also specify doubles are passed in 8-byte slots which are 8-byte aligned (instead of 4-byte aligned). This avoids a potential performance hazard where doubles span cacheline boundaries.

llvm-svn: 55807

load,store,call,return,bitcast.  This is enough to
make call and return work.

llvm-svn: 52691

llvm-svn: 50342

llvm-svn: 50324

On Darwin / Linux x86-32, v8i8, v4i16, v2i32 values are passed in MM[0-2].                                                                                                                                      
On Darwin / Linux x86-32, v1i64 values are passed in memory.                                                                                                                                                    
On Darwin x86-64, v8i8, v4i16, v2i32 values are passed in XMM[0-7].                                                                                                                                     
On Darwin x86-64, v1i64 values are passed in 64-bit GPRs.

llvm-svn: 50257

is needed for the x86-64-ABI handling of structs that contain floating-point
members that are returned by value.

llvm-svn: 49441

llvm-svn: 49440

when some another register is used for argument passing.
Currently is used on Win64.

llvm-svn: 49079

llvm-svn: 48710

llvm-svn: 48691

llvm-svn: 48690

This allows us to compile fp-stack-2results.ll into:

_test:
	fldz
	fld1
	ret

which returns 1 in ST(0) and 0 in ST(1).  This is needed for x86-64
_Complex long double.

llvm-svn: 48632

llvm-svn: 47483

llvm-svn: 46764

llvm-svn: 46262

parameters, since otherwise it won't be passed in
the right register.  With this change trampolines
work on x86-64 (thanks to Luke Guest for providing
access to an x86-64 box).

llvm-svn: 46192

Rename CCIfStruct to CCIfByVal and CCStructAssign to CCPassByVal. Remove unused parameters of CCStructAssign and add size and alignment requirement info.

llvm-svn: 45997

llvm-svn: 45996

llvm-svn: 45703

llvm-svn: 45701

llvm-svn: 45418

for parameter passing (only for that, on Darwin).

llvm-svn: 45038

llvm-svn: 44371

in favour of teaching CCAssignToStack that size 0 and/or align
0 means to use the ABI values.  This seems a neater solution.
It is safe since no legal value type has size 0.

llvm-svn: 44107

dealing with types whose size & alignment are
different on different subtargets.  Use it for x86 f80.

llvm-svn: 43988

trampolines, rather than with nested functions themselves.

llvm-svn: 42955

for fastcc from X86CallingConv.td.  This means that nested functions
are not supported for calling convention 'fastcc'.

llvm-svn: 42934

enabled by passing -tailcallopt to llc.  The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
  elf/pic enabled + callee is in module + callee has
  visibility protected or hidden

llvm-svn: 42870

llvm-svn: 42155

(on Darwin, anyway).  Fix some table omissions for
LD arithmetic.

llvm-svn: 40877

llvm-svn: 40566

llvm-svn: 37940

the recent lowering changes, this allows types like <4 x double> to
be returned, using two vector registers.

llvm-svn: 37844

Anton for half of this patch.

llvm-svn: 37641

llvm-svn: 35531

llvm-svn: 35523

llvm-svn: 35489

they always get registers.

llvm-svn: 34748

Factor out a CC_X86_32_Common convention, which is the part shared between
ccc, stdcall and fastcall

llvm-svn: 34732

llvm-svn: 34727