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Revert part of a fix from 2010, changes since then:

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a) x86-64 TLS has been documented
b) the code path should use movq for the correct relocation
   to be generated.

I've also added a fixme for the test case that we should improve
the code generated, it should look something like is documented
in the tls abi document.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192631 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2013-10-14 21:52:26 +00:00
parent 739eb9d82d
commit 9d0e94c16e
2 changed files with 6 additions and 2 deletions
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2
lib/Target/X86/X86InstrCompiler.td
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@ -969,7 +969,7 @@ def : Pat<(store (i64 (X86Wrapper tblockaddress:$src)), addr:$dst),
// tls has some funny stuff here...
// This corresponds to movabs $foo@tpoff, %rax
def : Pat<(i64 (X86Wrapper tglobaltlsaddr :$dst)),
(MOV64ri tglobaltlsaddr :$dst)>;
(MOV64ri32 tglobaltlsaddr :$dst)>;
// This corresponds to add $foo@tpoff, %rax
def : Pat<(add GR64:$src1, (X86Wrapper tglobaltlsaddr :$dst)),
(ADD64ri32 GR64:$src1, tglobaltlsaddr :$dst)>;

6
test/CodeGen/X86/x86-64-tls-1.ll
View File

@ -1,6 +1,10 @@
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
@tm_nest_level = internal thread_local global i32 0
define i64 @z() nounwind {
; CHECK: movabsq $tm_nest_level@TPOFF, %rcx
; FIXME: The codegen here is primative at best and could be much better.
; The add and the moves can be folded together.
; CHECK: movq $tm_nest_level@TPOFF, %rcx
; CHECK: movq %fs:0, %rax
; CHECK: addl %ecx, %eax
ret i64 and (i64 ptrtoint (i32* @tm_nest_level to i64), i64 100)
}