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Added tail call optimization to the x86 back end. It can be

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enabled by passing -tailcallopt to llc.  The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
  elf/pic enabled + callee is in module + callee has
  visibility protected or hidden


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42870 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Arnold Schwaighofer
2007-10-11 19:40:01 +00:00
parent 68c8411ef5
commit c85e1716f0
16 changed files with 928 additions and 65 deletions
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12
test/CodeGen/X86/tailcallpic1.ll Normal file
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; RUN: llvm-as < %s | llc -tailcallopt -mtriple=i686-pc-linux-gnu -relocation-model=pic | grep TAILCALL
define protected fastcc i32 @tailcallee(i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
entry:
ret i32 %a3
}
define fastcc i32 @tailcaller(i32 %in1, i32 %in2) {
entry:
%tmp11 = tail call fastcc i32 @tailcallee( i32 %in1, i32 %in2, i32 %in1, i32 %in2 ) ; <i32> [#uses=1]
ret i32 %tmp11
}