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https://github.com/c64scene-ar/llvm-6502.git
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98ca4f2a32
Instead of awkwardly encoding calling-convention information with ISD::CALL, ISD::FORMAL_ARGUMENTS, ISD::RET, and ISD::ARG_FLAGS nodes, TargetLowering provides three virtual functions for targets to override: LowerFormalArguments, LowerCall, and LowerRet, which replace the custom lowering done on the special nodes. They provide the same information, but in a more immediately usable format. This also reworks much of the target-independent tail call logic. The decision of whether or not to perform a tail call is now cleanly split between target-independent portions, and the target dependent portion in IsEligibleForTailCallOptimization. This also synchronizes all in-tree targets, to help enable future refactoring and feature work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78142 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
901 B
LLVM
25 lines
901 B
LLVM
; RUN: llvm-as < %s | llc -tailcallopt -march=x86-64 | FileCheck %s
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; Check that lowered arguments on the stack do not overwrite each other.
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; Add %in1 %p1 to a different temporary register (%eax).
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; CHECK: movl %edi, %eax
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; CHECK: addl 32(%rsp), %eax
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; Move param %in1 to temp register (%r10d).
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; CHECK: movl 40(%rsp), %r10d
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; Move result of addition to stack.
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; CHECK: movl %eax, 40(%rsp)
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; Move param %in2 to stack.
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; CHECK: movl %r10d, 32(%rsp)
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; Eventually, do a TAILCALL
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; CHECK: TAILCALL
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declare fastcc i32 @tailcallee(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %a, i32 %b)
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define fastcc i32 @tailcaller(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %in1, i32 %in2) {
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entry:
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%tmp = add i32 %in1, %p1
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%retval = tail call fastcc i32 @tailcallee(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %in2,i32 %tmp)
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ret i32 %retval
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}
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