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61ff754920
This adds the plumbing for the Tiny code model for the AArch64 backend. This, instead of loading addresses through the normal ADRP;ADD pair used in the Small model, uses a single ADR. The 21 bit range of an ADR means that the code and its statically defined symbols need to be within 1MB of each other. This makes it mostly interesting for embedded applications where we want to fit as much as we can in as small a space as possible. Differential Revision: https://reviews.llvm.org/D49673 llvm-svn: 340397
97 lines
3.6 KiB
LLVM
97 lines
3.6 KiB
LLVM
; RUN: llc -mtriple=arm64-none-linux-gnu -verify-machineinstrs -show-mc-encoding < %s | FileCheck %s
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; RUN: llc -mtriple=arm64-none-linux-gnu -filetype=obj < %s | llvm-objdump -r - | FileCheck --check-prefix=CHECK-RELOC %s
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; RUN: llc -mtriple=arm64-none-linux-gnu -verify-machineinstrs -show-mc-encoding -code-model=tiny < %s | FileCheck %s --check-prefix=CHECK-TINY
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; RUN: llc -mtriple=arm64-none-linux-gnu -filetype=obj < %s -code-model=tiny | llvm-objdump -r - | FileCheck --check-prefix=CHECK-TINY-RELOC %s
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; FIXME: We currently error for the large code model
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; RUN: not llc -mtriple=arm64-none-linux-gnu -verify-machineinstrs -show-mc-encoding -code-model=large < %s 2>&1 | FileCheck %s --check-prefix=CHECK-LARGE
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; CHECK-LARGE: ELF TLS only supported in small memory model
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@initial_exec_var = external thread_local(initialexec) global i32
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define i32 @test_initial_exec() {
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; CHECK-LABEL: test_initial_exec:
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%val = load i32, i32* @initial_exec_var
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; CHECK: adrp x[[GOTADDR:[0-9]+]], :gottprel:initial_exec_var
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; CHECK: ldr x[[TP_OFFSET:[0-9]+]], [x[[GOTADDR]], :gottprel_lo12:initial_exec_var]
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; CHECK: mrs x[[TP:[0-9]+]], TPIDR_EL0
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; CHECK: ldr w0, [x[[TP]], x[[TP_OFFSET]]]
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; CHECK-RELOC: R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
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; CHECK-RELOC: R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
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; CHECK-TINY: ldr x[[TP_OFFSET:[0-9]+]], :gottprel:initial_exec_var
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; CHECK-TINY: mrs x[[TP:[0-9]+]], TPIDR_EL0
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; CHECK-TINY: ldr w0, [x[[TP]], x[[TP_OFFSET]]]
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; CHECK-TINY-RELOC: R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
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ret i32 %val
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}
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define i32* @test_initial_exec_addr() {
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; CHECK-LABEL: test_initial_exec_addr:
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ret i32* @initial_exec_var
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; CHECK: adrp x[[GOTADDR:[0-9]+]], :gottprel:initial_exec_var
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; CHECK: ldr [[TP_OFFSET:x[0-9]+]], [x[[GOTADDR]], :gottprel_lo12:initial_exec_var]
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; CHECK: mrs [[TP:x[0-9]+]], TPIDR_EL0
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; CHECK: add x0, [[TP]], [[TP_OFFSET]]
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; CHECK-RELOC: R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
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; CHECK-RELOC: R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
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; CHECK-TINY: ldr x[[TP_OFFSET:[0-9]+]], :gottprel:initial_exec_var
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; CHECK-TINY: mrs [[TP:x[0-9]+]], TPIDR_EL0
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; CHECK-TINY: add x0, [[TP]], x[[TP_OFFSET]]
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; CHECK-TINY-RELOC: R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
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}
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@local_exec_var = thread_local(localexec) global i32 0
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define i32 @test_local_exec() {
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; CHECK-LABEL: test_local_exec:
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%val = load i32, i32* @local_exec_var
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; CHECK: mrs x[[R1:[0-9]+]], TPIDR_EL0
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; CHECK: add x[[R2:[0-9]+]], x[[R1]], :tprel_hi12:local_exec_var
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; CHECK: add x[[R3:[0-9]+]], x[[R2]], :tprel_lo12_nc:local_exec_var
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; CHECK: ldr w0, [x[[R3]]]
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; CHECK-RELOC: R_AARCH64_TLSLE_ADD_TPREL_HI12
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; CHECK-RELOC: R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
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; CHECK-TINY: mrs x[[R1:[0-9]+]], TPIDR_EL0
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; CHECK-TINY: add x[[R2:[0-9]+]], x[[R1]], :tprel_hi12:local_exec_var
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; CHECK-TINY: add x[[R3:[0-9]+]], x[[R2]], :tprel_lo12_nc:local_exec_var
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; CHECK-TINY: ldr w0, [x[[R3]]]
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; CHECK-TINY-RELOC: R_AARCH64_TLSLE_ADD_TPREL_HI12
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; CHECK-TINY-RELOC: R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
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ret i32 %val
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}
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define i32* @test_local_exec_addr() {
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; CHECK-LABEL: test_local_exec_addr:
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ret i32* @local_exec_var
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; CHECK: mrs x[[R1:[0-9]+]], TPIDR_EL0
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; CHECK: add x[[R2:[0-9]+]], x[[R1]], :tprel_hi12:local_exec_var
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; CHECK: add x0, x[[R2]], :tprel_lo12_nc:local_exec_var
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; CHECK: ret
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; CHECK-RELOC: R_AARCH64_TLSLE_ADD_TPREL_HI12
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; CHECK-RELOC: R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
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; CHECK-TINY: mrs x[[R1:[0-9]+]], TPIDR_EL0
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; CHECK-TINY: add x[[R2:[0-9]+]], x[[R1]], :tprel_hi12:local_exec_var
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; CHECK-TINY: add x0, x[[R2]], :tprel_lo12_nc:local_exec_var
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; CHECK-TINY: ret
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; CHECK-TINY-RELOC: R_AARCH64_TLSLE_ADD_TPREL_HI12
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; CHECK-TINY-RELOC: R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
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}
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