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[flang] Disable noalias by default #142128

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Merged
merged 2 commits into from
May 30, 2025
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[flang] Disable noalias by default #142128

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645f6c3
[flang] Disable noalias captures(none) by default
tblah May 30, 2025
e956bfc
Re-enable captures(none)
tblah May 30, 2025
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12 changes: 9 additions & 3 deletions flang/lib/Optimizer/Passes/Pipelines.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,11 @@
/// common to flang and the test tools.

#include "flang/Optimizer/Passes/Pipelines.h"
#include "llvm/Support/CommandLine.h"

/// Force setting the no-alias attribute on fuction arguments when possible.
static llvm::cl::opt<bool> forceNoAlias("force-no-alias", llvm::cl::Hidden,
llvm::cl::init(false));

namespace fir {

Expand Down Expand Up @@ -350,9 +355,10 @@ void createDefaultFIRCodeGenPassPipeline(mlir::PassManager &pm,
else
framePointerKind = mlir::LLVM::framePointerKind::FramePointerKind::None;

bool setNoCapture = false, setNoAlias = false;
if (config.OptLevel.isOptimizingForSpeed())
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Tom, will you be okay if I just remove this if? The LIT tests should still work, and it will be easier to re-enable the code, when function speciailization is fixed.

setNoCapture = setNoAlias = true;
// TODO: re-enable setNoAlias by default (when optimizing for speed) once
// function specialization is fixed.
bool setNoAlias = forceNoAlias;
bool setNoCapture = config.OptLevel.isOptimizingForSpeed();

pm.addPass(fir::createFunctionAttr(
{framePointerKind, config.InstrumentFunctionEntry,
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2 changes: 1 addition & 1 deletion flang/test/Fir/struct-passing-x86-64-byval.fir
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@@ -1,7 +1,7 @@
// Test X86-64 ABI rewrite of struct passed by value (BIND(C), VALUE derived types).
// This test test cases where the struct must be passed on the stack according
// to the System V ABI.
// RUN: tco --target=x86_64-unknown-linux-gnu %s | FileCheck %s
// RUN: tco --target=x86_64-unknown-linux-gnu --force-no-alias %s | FileCheck %s

module attributes {fir.defaultkind = "a1c4d8i4l4r4", fir.kindmap = "", llvm.data_layout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128", llvm.target_triple = "x86_64-unknown-linux-gnu"} {

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2 changes: 1 addition & 1 deletion flang/test/Fir/target-rewrite-complex-10-x86.fir
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@@ -1,6 +1,6 @@
// Test COMPLEX(10) passing and returning on X86
// RUN: fir-opt --target-rewrite="target=x86_64-unknown-linux-gnu" %s | FileCheck %s --check-prefix=AMD64
// RUN: tco -target="x86_64-unknown-linux-gnu" %s | FileCheck %s --check-prefix=AMD64_LLVM
// RUN: tco -target="x86_64-unknown-linux-gnu" --force-no-alias %s | FileCheck %s --check-prefix=AMD64_LLVM

module attributes {fir.defaultkind = "a1c4d8i4l4r4", fir.kindmap = "", llvm.data_layout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128", llvm.target_triple = "x86_64-unknown-linux-gnu"} {

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2 changes: 1 addition & 1 deletion flang/test/Fir/target.fir
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@@ -1,4 +1,4 @@
// RUN: tco --target=i386-unknown-linux-gnu %s | FileCheck %s --check-prefix=I32
// RUN: tco --target=i386-unknown-linux-gnu --force-no-alias %s | FileCheck %s --check-prefix=I32
// RUN: tco --target=x86_64-unknown-linux-gnu %s | FileCheck %s --check-prefix=X64
// RUN: tco --target=aarch64-unknown-linux-gnu %s | FileCheck %s --check-prefix=AARCH64
// RUN: tco --target=powerpc64le-unknown-linux-gnu %s | FileCheck %s --check-prefix=PPC
Expand Down