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AMDGPU: Add option to stress calls 

This inverts the behavior of the AlwaysInline pass to mark
every function not already marked alwaysinline as noinline.

llvm-svn: 313865
This commit is contained in:
Matt Arsenault 2017-09-21 07:00:48 +00:00
parent 6810367610
commit 1390af2dd2
2 changed files with 49 additions and 3 deletions
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16
llvm/lib/Target/AMDGPU/AMDGPUAlwaysInlinePass.cpp
View File

@ -21,6 +21,12 @@ using namespace llvm;
namespace {
static cl::opt<bool> StressCalls(
"amdgpu-stress-function-calls",
cl::Hidden,
cl::desc("Force all functions to be noinline"),
cl::init(false));
class AMDGPUAlwaysInline : public ModulePass {
bool GlobalOpt;
@ -57,9 +63,13 @@ bool AMDGPUAlwaysInline::runOnModule(Module &M) {
}
}
auto NewAttr = StressCalls ? Attribute::NoInline : Attribute::AlwaysInline;
auto IncompatAttr
= StressCalls ? Attribute::AlwaysInline : Attribute::NoInline;
for (Function &F : M) {
if (!F.hasLocalLinkage() && !F.isDeclaration() && !F.use_empty() &&
!F.hasFnAttribute(Attribute::NoInline))
!F.hasFnAttribute(IncompatAttr))
FuncsToClone.push_back(&F);
}
@ -71,8 +81,8 @@ bool AMDGPUAlwaysInline::runOnModule(Module &M) {
}
for (Function &F : M) {
if (F.hasLocalLinkage() && !F.hasFnAttribute(Attribute::NoInline)) {
F.addFnAttr(Attribute::AlwaysInline);
if (F.hasLocalLinkage() && !F.hasFnAttribute(IncompatAttr)) {
F.addFnAttr(NewAttr);
}
}
return false;

36
llvm/test/CodeGen/AMDGPU/stress-calls.ll Normal file
View File

@ -0,0 +1,36 @@
; RUN: opt -S -amdgpu-stress-function-calls -amdgpu-always-inline %s | FileCheck %s
; CHECK: define internal fastcc i32 @alwaysinline_func(i32 %a) #0 {
define internal fastcc i32 @alwaysinline_func(i32 %a) alwaysinline {
entry:
%tmp0 = add i32 %a, 1
ret i32 %tmp0
}
; CHECK: define internal fastcc i32 @noinline_func(i32 %a) #1 {
define internal fastcc i32 @noinline_func(i32 %a) noinline {
entry:
%tmp0 = add i32 %a, 2
ret i32 %tmp0
}
; CHECK: define internal fastcc i32 @unmarked_func(i32 %a) #1 {
define internal fastcc i32 @unmarked_func(i32 %a) {
entry:
%tmp0 = add i32 %a, 3
ret i32 %tmp0
}
define amdgpu_kernel void @kernel(i32 addrspace(1)* %out) {
entry:
%tmp0 = call i32 @alwaysinline_func(i32 1)
store volatile i32 %tmp0, i32 addrspace(1)* %out
%tmp1 = call i32 @noinline_func(i32 1)
store volatile i32 %tmp1, i32 addrspace(1)* %out
%tmp2 = call i32 @unmarked_func(i32 1)
store volatile i32 %tmp2, i32 addrspace(1)* %out
ret void
}
; CHECK: attributes #0 = { alwaysinline }
; CHECK: attributes #1 = { noinline }