57f4ae4625
Enable tail calls by default for (micro)MIPS(64). microMIPS is slightly more tricky than doing it for MIPS(R6) or microMIPSR6. microMIPS has two instruction encodings: 16bit and 32bit along with some restrictions on the size of the instruction that can fill the delay slot. For safe tail calls for microMIPS, the delay slot filler attempts to find a correct size instruction for the delay slot of TAILCALL pseudos. Reviewers: dsanders, vkalintris Subscribers: jfb, dsanders, sdardis, llvm-commits Differential Revision: https://reviews.llvm.org/D21138 llvm-svn: 277708
42 lines
1.0 KiB
LLVM
42 lines
1.0 KiB
LLVM
; RUN: llc -march=mipsel -relocation-model=pic < %s | FileCheck %s
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; CHECK-LABEL: foo6:
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; CHECK: %while.body
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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; CHECK: %while.end
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define void @foo6(i32 %n) {
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entry:
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%tobool1 = icmp eq i32 %n, 0
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br i1 %tobool1, label %while.end, label %while.body
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while.body: ; preds = %entry, %while.body
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%n.addr.02 = phi i32 [ %dec, %while.body ], [ %n, %entry ]
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%dec = add nsw i32 %n.addr.02, -1
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tail call void @foo2()
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%tobool = icmp eq i32 %dec, 0
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br i1 %tobool, label %while.end, label %while.body
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while.end: ; preds = %while.body, %entry
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ret void
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}
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declare void @foo2()
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; CHECK-LABEL: foo1:
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jalr $25
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; CHECK: lw $25, %call16(foo2)(${{[0-9]+}})
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; CHECK: jr $25
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define void @foo1() {
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entry:
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tail call void @foo2()
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tail call void @foo2()
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tail call void @foo2()
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ret void
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}
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