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llvm-project/llvm/test/CodeGen/PowerPC/preemption.ll

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Represent runtime preemption in the IR. Currently we do not represent runtime preemption in the IR, which has several drawbacks: 1) The semantics of GlobalValues differ depending on the object file format you are targeting (as well as the relocation-model and -fPIE value). 2) We have no way of disabling inlining of run time interposable functions, since in the IR we only know if a function is link-time interposable. Because of this llvm cannot support elf-interposition semantics. 3) In LTO builds of executables we will have extra knowledge that a symbol resolved to a local definition and can't be preemptable, but have no way to propagate that knowledge through the compiler. This patch adds preemptability specifiers to the IR with the following meaning: dso_local --> means the compiler may assume the symbol will resolve to a definition within the current linkage unit and the symbol may be accessed directly even if the definition is not within this compilation unit. dso_preemptable --> means that the compiler must assume the GlobalValue may be replaced with a definition from outside the current linkage unit at runtime. To ease transitioning dso_preemptable is treated as a 'default' in that low-level codegen will still do the same checks it did previously to see if a symbol should be accessed indirectly. Eventually when IR producers emit the specifiers on all Globalvalues we can change dso_preemptable to mean 'always access indirectly', and remove the current logic. Differential Revision: https://reviews.llvm.org/D20217 llvm-svn: 316668
2017-10-26 23:00:26 +08:00
; RUN: llc -mtriple powerpc64le-unkown-gnu-linux < %s | FileCheck %s
; RUN: llc -mtriple powerpc64le-unkown-gnu-linux -relocation-model=static \
; RUN: < %s | FileCheck --check-prefix=STATIC %s
; RUN: llc -mtriple powerpc64le-unkown-gnu-linux -relocation-model=pic \
; RUN: < %s | FileCheck %s
; globals
@strong_default = global i32 55
define i32* @get_strong_default() #0 {
ret i32* @strong_default
; STATIC-LABEL: @get_strong_default
; STATIC: addis 3, 2, strong_default@toc@ha
; STATIC: addi 3, 3, strong_default@toc@l
; STATIC: blr
; CHECK-LABEL: @get_strong_default
; CHECK: addis 3, 2, .LC0@toc@ha
; CHECK: ld 3, .LC0@toc@l(3)
; CHECK: blr
}
@weak_default = weak global i32 55
define i32* @get_weak_default() #0 {
ret i32* @weak_default
; STATIC-LABEL: @get_weak_default
; STATIC: addis 3, 2, weak_default@toc@ha
; STATIC: addi 3, 3, weak_default@toc@l
; STATIC: blr
; CHECK-LABEL: @get_weak_default
; CHECK: addis 3, 2, .LC1@toc@ha
; CHECK: ld 3, .LC1@toc@l(3)
; CHECK: blr
}
@external_default_global = external global i32
define i32* @get_external_default_global() {
ret i32* @external_default_global
; STATIC-LABEL: @get_external_default_global
; STATIC: addis 3, 2, .LC0@toc@ha
; STATIC: ld 3, .LC0@toc@l(3)
; STATIC: blr
; CHECK-LABEL: @get_external_default_global
; CHECK: addis 3, 2, .LC2@toc@ha
; CHECK: ld 3, .LC2@toc@l(3)
; CHECK: blr
}
@strong_local_global = dso_local global i32 55
define i32* @get_strong_local_global() {
ret i32* @strong_local_global
; STATIC-LABEL: @get_strong_local_global
; STATIC: addis 3, 2, strong_local_global@toc@ha
; STATIC: addi 3, 3, strong_local_global@toc@l
; STATIC: blr
; CHECK-LABEL: @get_strong_local_global
; CHECK: addis 3, 2, strong_local_global@toc@ha
; CHECK: addi 3, 3, strong_local_global@toc@l
; CHECK: blr
}
@weak_local_global = weak dso_local global i32 42
define i32* @get_weak_local_global() {
ret i32* @weak_local_global
; STATIC-LABEL: @get_weak_local_global
; STATIC: addis 3, 2, weak_local_global@toc@ha
; STATIC: addi 3, 3, weak_local_global@toc@l
; STATIC: blr
; CHECK-LABEL: @get_weak_local_global
; CHECK: addis 3, 2, weak_local_global@toc@ha
; CHECK: addi 3, 3, weak_local_global@toc@l
; CHECK: blr
}
@external_local_global = external dso_local global i32
define i32* @get_external_local_global() {
ret i32* @external_local_global
; STATIC-LABEL: @get_external_local_global
; STATIC: addis 3, 2, external_local_global@toc@ha
; STATIC: addi 3, 3, external_local_global@toc@l
; STATIC: blr
; CHECK-LABEL: @get_external_local_global
; CHECK: addis 3, 2, external_local_global@toc@ha
; CHECK: addi 3, 3, external_local_global@toc@l
; CHECK: blr
}
@strong_preemptable_global = dso_preemptable global i32 42
define i32* @get_strong_preemptable_global() {
ret i32* @strong_preemptable_global
; STATIC-LABEL: @get_strong_preemptable_global
; STATIC: addis 3, 2, strong_preemptable_global@toc@ha
; STATIC: addi 3, 3, strong_preemptable_global@toc@l
; STATIC: blr
; CHECK-LABEL: @get_strong_preemptable_global
; CHECK: addis 3, 2, .LC3@toc@ha
; CHECK: ld 3, .LC3@toc@l(3)
; CHECK: blr
}
@weak_preemptable_global = weak dso_preemptable global i32 42
define i32* @get_weak_preemptable_global() {
ret i32* @weak_preemptable_global
; STATIC-LABEL: @get_weak_preemptable_global
; STATIC: addis 3, 2, weak_preemptable_global@toc@ha
; STATIC: addi 3, 3, weak_preemptable_global@toc@l
; STATIC: blr
; CHECK-LABEL: @get_weak_preemptable_global
; CHECK: addis 3, 2, .LC4@toc@ha
; CHECK: ld 3, .LC4@toc@l(3)
; CHECK: blr
}
@external_preemptable_global = external dso_preemptable global i32
define i32* @get_external_preemptable_global() {
ret i32* @external_preemptable_global
; STATIC-LABEL: @get_external_preemptable_global
; STATIC: addis 3, 2, .LC1@toc@ha
; STATIC: ld 3, .LC1@toc@l(3)
; STATIC: blr
; CHECK-LABEL: @get_external_preemptable_global
; CHECK: addis 3, 2, .LC5@toc@ha
; CHECK: ld 3, .LC5@toc@l(3)
; CHECK: blr
}
; functions
define signext i32 @strong_default_function(i32 %i) {
ret i32 %i
}
define signext i32 @strong_default_function_caller(i32 %i) {
%call = notail call signext i32 @strong_default_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @strong_default_function_caller
; STATIC: bl strong_default_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @strong_default_function_caller
; CHECK: bl strong_default_function
; CHECK-NEXT: nop
; CHECK: blr
}
define weak signext i32 @weak_default_function(i32 %i) {
ret i32 %i
}
define signext i32 @weak_default_function_caller(i32 %i) {
%call = notail call signext i32 @weak_default_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @weak_default_function_caller
; STATIC: bl weak_default_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @weak_default_function_caller
; CHECK: bl weak_default_function
; CHECK-NEXT: nop
; CHECK: blr
}
declare i32 @external_default_function(i32 %i)
define i32 @external_default_function_caller(i32 %i) {
%call = notail call signext i32 @external_default_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @external_default_function_caller
; STATIC: bl external_default_function
; STATIC-NEXT: nop
; STATIC: blr
; CHECK-LABEL: @external_default_function_caller
; CHECK: bl external_default_function
; CHECK-NEXT: nop
; CHECK: blr
}
define dso_local signext i32 @strong_local_function(i32 %i) {
ret i32 %i
}
define signext i32 @strong_local_function_caller(i32 %i) {
%call = notail call signext i32 @strong_local_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @strong_local_function_caller
; STATIC: bl strong_local_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @strong_local_function_caller
; CHECK: bl strong_local_function
; CHECK-NOT: nop
; CHECK: blr
}
define weak dso_local signext i32 @weak_local_function(i32 %i) {
ret i32 %i
}
define signext i32 @weak_local_function_caller(i32 %i) {
%call = notail call signext i32 @weak_local_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @weak_local_function_caller
; STATIC: bl weak_local_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @weak_local_function_caller
; CHECK: bl weak_local_function
; CHECK-NOT: nop
; CHECK: blr
}
declare dso_local i32 @external_local_function(i32 %i)
define i32 @external_local_function_caller(i32 %i) {
%call = notail call signext i32 @external_local_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @external_local_function_caller
; STATIC: bl external_local_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @external_local_function_caller
; CHECK: bl external_local_function
; CHECK-NOT: nop
; CHECK: blr
}
define dso_preemptable signext i32 @strong_preemptable_function(i32 %i) {
ret i32 %i
}
define signext i32 @strong_preemptable_function_caller(i32 %i) {
%call = notail call signext i32 @strong_preemptable_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @strong_preemptable_function_caller
; STATIC: bl strong_preemptable_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @strong_preemptable_function_caller
; CHECK: bl strong_preemptable_function
; CHECK-NEXT: nop
; CHECK: blr
}
define weak dso_preemptable signext i32 @weak_preemptable_function(i32 %i) {
ret i32 %i
}
define signext i32 @weak_preemptable_function_caller(i32 %i) {
%call = notail call signext i32 @weak_preemptable_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @weak_preemptable_function_caller
; STATIC: bl weak_preemptable_function
; STATIC-NOT: nop
; STATIC: blr
; CHECK-LABEL: @weak_preemptable_function_caller
; CHECK: bl weak_preemptable_function
; CHECK-NEXT: nop
; CHECK: blr
}
declare dso_preemptable i32 @external_preemptable_function(i32 %i)
define i32 @external_preemptable_function_caller(i32 %i) {
%call = notail call signext i32 @external_preemptable_function(i32 signext %i)
ret i32 %call
; STATIC-LABEL: @external_preemptable_function_caller
; STATIC: bl external_preemptable_function
; STATIC-NEXT: nop
; STATIC: blr
; CHECK-LABEL: @external_preemptable_function_caller
; CHECK: bl external_preemptable_function
; CHECK-NEXT: nop
; CHECK: blr
}