diff options
| author | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-04 16:18:08 +0000 |
|---|---|---|
| committer | Bill Schmidt <wschmidt@linux.vnet.ibm.com> | 2012-12-04 16:18:08 +0000 |
| commit | d7802bf0ddcac16ee910105922492aee86a53e1b (patch) | |
| tree | 693685ea4b0a01cef8c62f4f595f9a6e6712c197 /test/CodeGen/PowerPC/tls-ie.ll | |
| parent | 315f09f422a3c33a44e6d5c2a78f284a9304994d (diff) | |
| download | llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.gz llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.bz2 llvm-d7802bf0ddcac16ee910105922492aee86a53e1b.tar.xz | |
This patch introduces initial-exec model support for thread-local storage
on 64-bit PowerPC ELF.
The patch includes code to handle external assembly and MC output with the
integrated assembler. It intentionally does not support the "old" JIT.
For the initial-exec TLS model, the ABI requires the following to calculate
the address of external thread-local variable x:
Code sequence Relocation Symbol
ld 9,x@got@tprel(2) R_PPC64_GOT_TPREL16_DS x
add 9,9,x@tls R_PPC64_TLS x
The register 9 is arbitrary here. The linker will replace x@got@tprel
with the offset relative to the thread pointer to the generated GOT
entry for symbol x. It will replace x@tls with the thread-pointer
register (13).
The two test cases verify correct assembly output and relocation output
as just described.
PowerPC-specific selection node variants are added for the two
instructions above: LD_GOT_TPREL and ADD_TLS. These are inserted
when an initial-exec global variable is encountered by
PPCTargetLowering::LowerGlobalTLSAddress(), and later lowered to
machine instructions LDgotTPREL and ADD8TLS. LDgotTPREL is a pseudo
that uses the same LDrs support added for medium code model's LDtocL,
with a different relocation type.
The rest of the processing is straightforward.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169281 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/PowerPC/tls-ie.ll')
| -rw-r--r-- | test/CodeGen/PowerPC/tls-ie.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/test/CodeGen/PowerPC/tls-ie.ll b/test/CodeGen/PowerPC/tls-ie.ll new file mode 100644 index 0000000000..cc6f084efb --- /dev/null +++ b/test/CodeGen/PowerPC/tls-ie.ll @@ -0,0 +1,21 @@ +; RUN: llc -mcpu=pwr7 -O0 <%s | FileCheck %s + +; Test correct assembly code generation for thread-local storage +; using the initial-exec model. + +target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64" +target triple = "powerpc64-unknown-linux-gnu" + +@a = external thread_local global i32 + +define signext i32 @main() nounwind { +entry: + %retval = alloca i32, align 4 + store i32 0, i32* %retval + %0 = load i32* @a, align 4 + ret i32 %0 +} + +; CHECK: ld [[REG:[0-9]+]], a@got@tprel(2) +; CHECK: add {{[0-9]+}}, [[REG]], a@tls + |