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a973c0bd85
When the target option GuaranteedTailCallOpt is specified, calls with the fastcc calling convention will be transformed into tail calls if they are in tail position. This diff adds a new calling convention, tailcc, currently supported only on X86, which behaves the same way as fastcc, except that the GuaranteedTailCallOpt flag does not need to enabled in order to enable tail call optimization. Patch by Dwight Guth <dwight.guth@runtimeverification.com>! Reviewed By: lebedev.ri, paquette, rnk Differential Revision: https://reviews.llvm.org/D67855 llvm-svn: 373976
22 lines
693 B
LLVM
22 lines
693 B
LLVM
; RUN: llc < %s -mtriple=i686-unknown-linux | FileCheck %s
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%struct.s = type {i32, i32, i32, i32, i32, i32, i32, i32,
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i32, i32, i32, i32, i32, i32, i32, i32,
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i32, i32, i32, i32, i32, i32, i32, i32 }
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define tailcc i32 @tailcallee(%struct.s* byval %a) nounwind {
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entry:
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%tmp2 = getelementptr %struct.s, %struct.s* %a, i32 0, i32 0
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%tmp3 = load i32, i32* %tmp2
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ret i32 %tmp3
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; CHECK: tailcallee
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; CHECK: movl 4(%esp), %eax
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}
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define tailcc i32 @tailcaller(%struct.s* byval %a) nounwind {
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entry:
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%tmp4 = tail call tailcc i32 @tailcallee(%struct.s* byval %a )
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ret i32 %tmp4
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; CHECK: tailcaller
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; CHECK: jmp tailcallee
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}
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