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llvm-project/llvm/test/CodeGen/X86/x86-64-tls-1.ll

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Add some codegen patterns for x86_64-linux-gnu tls codegen matching. Based on a patch by Patrick Marlier! llvm-svn: 106433
2010-06-22 02:21:27 +08:00
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s
@tm_nest_level = internal thread_local global i32 0
define i64 @z() nounwind {
[SDAG] Introduce a combined set to the DAG combiner which tracks nodes which have successfully round-tripped through the combine phase, and use this to ensure all operands to DAG nodes are visited by the combiner, even if they are only added during the combine phase. This is critical to have the combiner reach nodes that are *introduced* during combining. Previously these would sometimes be visited and sometimes not be visited based on whether they happened to end up on the worklist or not. Now we always run them through the combiner. This fixes quite a few bad codegen test cases lurking in the suite while also being more principled. Among these, the TLS codegeneration is particularly exciting for programs that have this in the critical path like TSan-instrumented binaries (although I think they engineer to use a different TLS that is faster anyways). I've tried to check for compile-time regressions here by running llc over a merged (but not LTO-ed) clang bitcode file and observed at most a 3% slowdown in llc. Given that this is essentially a worst case (none of opt or clang are running at this phase) I think this is tolerable. The actual LTO case should be even less costly, and the cost in normal compilation should be negligible. With this combining logic, it is possible to re-legalize as we combine which is necessary to implement PSHUFB formation on x86 as a post-legalize DAG combine (my ultimate goal). Differential Revision: http://reviews.llvm.org/D4638 llvm-svn: 213898
2014-07-25 06:15:28 +08:00
; CHECK: movq $tm_nest_level@TPOFF, %r[[R0:[abcd]]]x
; CHECK-NEXT: addl %fs:0, %e[[R0]]x
; CHECK-NEXT: andq $100, %r[[R0]]x
Add some codegen patterns for x86_64-linux-gnu tls codegen matching. Based on a patch by Patrick Marlier! llvm-svn: 106433
2010-06-22 02:21:27 +08:00
ret i64 and (i64 ptrtoint (i32* @tm_nest_level to i64), i64 100)
}