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llvm-project/llvm/test/CodeGen/ARM/execute-only-section.ll

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Rewrite ARM execute only support to avoid the use of a command line flag and unqualified ARMSubtarget lookup. Paired with a clang commit to use the new behavior. llvm-svn: 306927
2017-07-01 10:55:22 +08:00
; RUN: llc < %s -mtriple=thumbv7m -mattr=+execute-only %s -o - | FileCheck %s
; RUN: llc < %s -mtriple=thumbv8m.base -mattr=+execute-only %s -o - | FileCheck %s
[ARM] Allow execute only code on Cortex-m23 The NoMovt feature prevents the use of MOVW/MOVT instructions on Cortex-M23 for performance reasons. These instructions are required for execute only code so NoMovt should be disabled when that option is enabled. Differential Revision: https://reviews.llvm.org/D52551 llvm-svn: 343302
2018-09-28 16:55:19 +08:00
; RUN: llc < %s -mtriple=thumbv8m.base -mcpu=cortex-m23 -mattr=+execute-only %s -o - | FileCheck %s
Rewrite ARM execute only support to avoid the use of a command line flag and unqualified ARMSubtarget lookup. Paired with a clang commit to use the new behavior. llvm-svn: 306927
2017-07-01 10:55:22 +08:00
; RUN: llc < %s -mtriple=thumbv8m.main -mattr=+execute-only %s -o - | FileCheck %s
[ARM] Implement execute-only support in CodeGen This implements execute-only support for ARM code generation, which prevents the compiler from generating data accesses to code sections. The following changes are involved: * Add the CodeGen option "-arm-execute-only" to the ARM code generator. * Add the clang flag "-mexecute-only" as well as the GCC-compatible alias "-mpure-code" to enable this option. * When enabled, literal pools are replaced with MOVW/MOVT instructions, with VMOV used in addition for floating-point literals. As the MOVT instruction is required, execute-only support is only available in Thumb mode for targets supporting ARMv8-M baseline or Thumb2. * Jump tables are placed in data sections when in execute-only mode. * The execute-only text section is assigned section ID 0, and is marked as unreadable with the SHF_ARM_PURECODE flag with symbol 'y'. This also overrides selection of ELF sections for globals. llvm-svn: 289784
2016-12-15 15:59:08 +08:00
; CHECK: .section .text,"axy",%progbits,unique,0
; CHECK-NOT: .section
; CHECK-NOT: .text
; CHECK: .globl test_SectionForGlobal
; CHECK: .type test_SectionForGlobal,%function
define void @test_SectionForGlobal() {
entry:
ret void
}
; CHECK: .section .test,"axy",%progbits
; CHECK-NOT: .section
; CHECK-NOT: .text
; CHECK: .globl test_ExplicitSectionForGlobal
; CHECK: .type test_ExplicitSectionForGlobal,%function
define void @test_ExplicitSectionForGlobal() section ".test" {
entry:
ret void
}