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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 |