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53d4bcf35e
Integer return values are sign or zero extended by the callee, and
structs up to 32 bytes in size can be returned in registers.
The CC_Sparc64 CallingConv definition is shared between
LowerFormalArguments_64 and LowerReturn_64. Function arguments and
return values are passed in the same registers.
The inreg flag is also used for return values. This is required to handle
C functions returning structs containing floats and ints:
struct ifp {
int i;
float f;
};
struct ifp f(void);
LLVM IR:
define inreg { i32, float } @f() {
...
ret { i32, float } %retval
}
The ABI requires that %retval.i is returned in the high bits of %i0
while %retval.f goes in %f1.
Without the inreg return value attribute, %retval.i would go in %i0 and
%retval.f would go in %f3 which is a more efficient way of returning
%multiple values, but it is not ABI compliant for returning C structs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178966 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| 64abi.ll | ||
| 64bit.ll | ||
| 64cond.ll | ||
| 2006-01-22-BitConvertLegalize.ll | ||
| 2007-05-09-JumpTables.ll | ||
| 2007-07-05-LiveIntervalAssert.ll | ||
| 2008-10-10-InlineAsmMemoryOperand.ll | ||
| 2008-10-10-InlineAsmRegOperand.ll | ||
| 2009-08-28-PIC.ll | ||
| 2009-08-28-WeakLinkage.ll | ||
| 2011-01-11-Call.ll | ||
| 2011-01-11-CC.ll | ||
| 2011-01-11-FrameAddr.ll | ||
| 2011-01-19-DelaySlot.ll | ||
| 2011-01-21-ByValArgs.ll | ||
| 2011-01-22-SRet.ll | ||
| 2011-12-03-TailDuplication.ll | ||
| 2012-05-01-LowerArguments.ll | ||
| basictest.ll | ||
| ctpop.ll | ||
| DbgValueOtherTargets.test | ||
| lit.local.cfg | ||
| mult-alt-generic-sparc.ll | ||
| private.ll | ||