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10af09a34f
The patch adds a possibility to make library calls on NVPTX. An important thing about library functions - they must be defined within the current module. This basically should guarantee that we produce a valid PTX assembly (without calls to not defined functions). The one who wants to use the libcalls is probably will have to link against compiler-rt or any other implementation. Currently, it's completely impossible to make library calls because of error LLVM ERROR: Cannot select: i32 = ExternalSymbol '...'. But we can lower ExternalSymbol to TargetExternalSymbol and verify if the function definition is available. Also, there was an issue with a DAG during legalisation. When we expand instruction into libcall, the inner call-chain isn't being "integrated" into outer chain. Since the last "data-flow" (call retval load) node is located in call-chain earlier than CALLSEQ_END node, the latter becomes a leaf and therefore a dead node (and is being removed quite fast). Proposed here solution relies on another data-flow pseudo nodes (ProxyReg) which purpose is only to keep CALLSEQ_END at legalisation and instruction selection phases - we remove the pseudo instructions before register scheduling phase. Patch by Denys Zariaiev! Differential Revision: https://reviews.llvm.org/D34708 llvm-svn: 350069
23 lines
433 B
LLVM
23 lines
433 B
LLVM
; RUN: llc < %s -march=nvptx 2>&1 | FileCheck %s
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; Make sure the example doesn't crash with segfault
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; CHECK: .visible .func ({{.*}}) loop
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define i32 @loop(i32, i32) {
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entry:
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br label %loop
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loop:
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%i = phi i32 [ %0, %entry ], [ %res, %loop ]
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%res = call i32 @div(i32 %i, i32 %1)
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%exitcond = icmp eq i32 %res, %0
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br i1 %exitcond, label %exit, label %loop
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exit:
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ret i32 %res
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}
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define i32 @div(i32, i32) {
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ret i32 0
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}
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