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Resubmit r356511 "[TailCallElim] Add tailcall elimination pass to LTO pipelines"

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Failing LLD tests have been fixed in r356593.

llvm-svn: 356594
This commit is contained in:
Robert Lougher 2019-03-20 19:08:18 +00:00
parent 0fe4e29071
commit 46e12bc5ef
4 changed files with 31 additions and 0 deletions
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4
lib/Passes/PassBuilder.cpp
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@ -1185,6 +1185,10 @@ PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
// Break up allocas
FPM.addPass(SROA());
// LTO provides additional opportunities for tailcall elimination due to
// link-time inlining, and visibility of nocapture attribute.
FPM.addPass(TailCallElimPass());
// Run a few AA driver optimizations here and now to cleanup the code.
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));

4
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -896,6 +896,10 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
// Break up allocas
PM.add(createSROAPass());
// LTO provides additional opportunities for tailcall elimination due to
// link-time inlining, and visibility of nocapture attribute.
PM.add(createTailCallEliminationPass());
// Run a few AA driven optimizations here and now, to cleanup the code.
PM.add(createPostOrderFunctionAttrsLegacyPass()); // Add nocapture.
PM.add(createGlobalsAAWrapperPass()); // IP alias analysis.

22
test/LTO/X86/tailcallelim.ll Normal file
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@ -0,0 +1,22 @@
; Check that the LTO pipelines add the Tail Call Elimination pass.
; RUN: llvm-as < %s > %t1
; RUN: llvm-lto -o %t2 %t1 --exported-symbol=foo -save-merged-module
; RUN: llvm-dis < %t2.merged.bc | FileCheck %s
; RUN: llvm-lto2 run -r %t1,foo,plx -r %t1,bar,plx -o %t3 %t1 -save-temps
; RUN: llvm-dis < %t3.0.4.opt.bc | FileCheck %s
; RUN: llvm-lto2 run -r %t1,foo,plx -r %t1,bar,plx -o %t4 %t1 -save-temps -use-new-pm
; RUN: llvm-dis < %t4.0.4.opt.bc | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define void @foo() {
; CHECK: tail call void @bar()
call void @bar()
ret void
}
declare void @bar()

1
test/Other/new-pm-lto-defaults.ll
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@ -81,6 +81,7 @@
; CHECK-O2-NEXT: Running pass: JumpThreadingPass
; CHECK-O2-NEXT: Running analysis: LazyValueAnalysis
; CHECK-O2-NEXT: Running pass: SROA on foo
; CHECK-O2-NEXT: Running pass: TailCallElimPass on foo
; CHECK-O2-NEXT: Finished llvm::Function pass manager run.
; CHECK-O2-NEXT: Running pass: ModuleToPostOrderCGSCCPassAdaptor<{{.*}}PostOrderFunctionAttrsPass>
; CHECK-O2-NEXT: Running pass: ModuleToFunctionPassAdaptor<{{.*}}PassManager{{.*}}>