https://github.com/tstellar updated
https://github.com/llvm/llvm-project/pull/92143
>From a7cd0c61123889a632ceea67dc8c8e2c8753ae08 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.top...@sifive.com>
Date: Thu, 16 May 2024 12:27:05 -0700
Subject: [PATCH] [RISCV] Add a unaligned-scalar-mem feature like we had in
clang 17.
This is ORed with the fast-unaligned-access feature which applies
to scalar and vector together.:
---
llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp | 5 +++--
llvm/lib/Target/RISCV/RISCVFeatures.td | 5 +++++
llvm/lib/Target/RISCV/RISCVISelLowering.cpp | 9 ++++++---
llvm/test/CodeGen/RISCV/memcpy-inline.ll | 4 ++++
llvm/test/CodeGen/RISCV/memcpy.ll | 4 ++++
llvm/test/CodeGen/RISCV/memset-inline.ll | 4 ++++
llvm/test/CodeGen/RISCV/pr56110.ll | 1 +
llvm/test/CodeGen/RISCV/unaligned-load-store.ll | 4 ++++
8 files changed, 31 insertions(+), 5 deletions(-)
diff --git a/llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp
b/llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp
index 0a314fdd41cbe..89207640ee54a 100644
--- a/llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp
@@ -317,8 +317,9 @@ bool
RISCVExpandPseudo::expandRV32ZdinxStore(MachineBasicBlock &MBB,
.addReg(MBBI->getOperand(1).getReg())
.add(MBBI->getOperand(2));
if (MBBI->getOperand(2).isGlobal() || MBBI->getOperand(2).isCPI()) {
- // FIXME: Zdinx RV32 can not work on unaligned memory.
- assert(!STI->hasFastUnalignedAccess());
+ // FIXME: Zdinx RV32 can not work on unaligned scalar memory.
+ assert(!STI->hasFastUnalignedAccess() &&
+ !STI->enableUnalignedScalarMem());
assert(MBBI->getOperand(2).getOffset() % 8 == 0);
MBBI->getOperand(2).setOffset(MBBI->getOperand(2).getOffset() + 4);
diff --git a/llvm/lib/Target/RISCV/RISCVFeatures.td
b/llvm/lib/Target/RISCV/RISCVFeatures.td
index 26451c80f57b4..1bb6b6a561f4a 100644
--- a/llvm/lib/Target/RISCV/RISCVFeatures.td
+++ b/llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -1025,6 +1025,11 @@ def FeatureFastUnalignedAccess
"true", "Has reasonably performant unaligned "
"loads and stores (both scalar and vector)">;
+def FeatureUnalignedScalarMem
+ : SubtargetFeature<"unaligned-scalar-mem", "EnableUnalignedScalarMem",
+ "true", "Has reasonably performant unaligned scalar "
+ "loads and stores">;
+
def FeaturePostRAScheduler : SubtargetFeature<"use-postra-scheduler",
"UsePostRAScheduler", "true", "Schedule again after register allocation">;
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index d46093b9e260a..3fe7ddfdd4279 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -1883,7 +1883,8 @@ bool
RISCVTargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
// replace. If we don't support unaligned scalar mem, prefer the constant
// pool.
// TODO: Can the caller pass down the alignment?
- if (!Subtarget.hasFastUnalignedAccess())
+ if (!Subtarget.hasFastUnalignedAccess() &&
+ !Subtarget.enableUnalignedScalarMem())
return true;
// Prefer to keep the load if it would require many instructions.
@@ -19772,8 +19773,10 @@ bool
RISCVTargetLowering::allowsMisalignedMemoryAccesses(
unsigned *Fast) const {
if (!VT.isVector()) {
if (Fast)
- *Fast = Subtarget.hasFastUnalignedAccess();
- return Subtarget.hasFastUnalignedAccess();
+ *Fast = Subtarget.hasFastUnalignedAccess() ||
+ Subtarget.enableUnalignedScalarMem();
+ return Subtarget.hasFastUnalignedAccess() ||
+ Subtarget.enableUnalignedScalarMem();
}
// All vector implementations must support element alignment
diff --git a/llvm/test/CodeGen/RISCV/memcpy-inline.ll
b/llvm/test/CodeGen/RISCV/memcpy-inline.ll
index 343695ee37da8..709b8264b5833 100644
--- a/llvm/test/CodeGen/RISCV/memcpy-inline.ll
+++ b/llvm/test/CodeGen/RISCV/memcpy-inline.ll
@@ -7,6 +7,10 @@
; RUN: | FileCheck %s --check-prefixes=RV32-BOTH,RV32-FAST
; RUN: llc < %s -mtriple=riscv64 -mattr=+fast-unaligned-access \
; RUN: | FileCheck %s --check-prefixes=RV64-BOTH,RV64-FAST
+; RUN: llc < %s -mtriple=riscv32 -mattr=+unaligned-scalar-mem \
+; RUN: | FileCheck %s --check-prefixes=RV32-BOTH,RV32-FAST
+; RUN: llc < %s -mtriple=riscv64 -mattr=+unaligned-scalar-mem \
+; RUN: | FileCheck %s --check-prefixes=RV64-BOTH,RV64-FAST
; ----------------------------------------------------------------------
; Fully unaligned cases
diff --git a/llvm/test/CodeGen/RISCV/memcpy.ll
b/llvm/test/CodeGen/RISCV/memcpy.ll
index 12ec0881b20d9..f8f5d25947d7f 100644
--- a/llvm/test/CodeGen/RISCV/memcpy.ll
+++ b/llvm/test/CodeGen/RISCV/memcpy.ll
@@ -7,6 +7,10 @@
; RUN: | FileCheck %s --check-prefixes=RV32-BOTH,RV32-FAST
; RUN: llc < %s -mtriple=riscv64 -mattr=+fast-unaligned-access \
; RUN: | FileCheck %s --check-prefixes=RV64-BOTH,RV64-FAST
+; RUN: llc < %s -mtriple=riscv32 -mattr=+unaligned-scalar-mem \
+; RUN: | FileCheck %s --check-prefixes=RV32-BOTH,RV32-FAST
+; RUN: llc < %s -mtriple=riscv64 -mattr=+unaligned-scalar-mem \
+; RUN: | FileCheck %s --check-prefixes=RV64-BOTH,RV64-FAST
%struct.x = type { i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8 }
@src = external dso_local global %struct.x
diff --git a/llvm/test/CodeGen/RISCV/memset-inline.ll
b/llvm/test/CodeGen/RISCV/memset-inline.ll
index cc22b77c641e2..e131a3480c89e 100644
--- a/llvm/test/CodeGen/RISCV/memset-inline.ll
+++ b/llvm/test/CodeGen/RISCV/memset-inline.ll
@@ -7,6 +7,10 @@
; RUN: | FileCheck %s --check-prefixes=RV32-BOTH,RV32-FAST
; RUN: llc < %s -mtriple=riscv64 -mattr=+m,+fast-unaligned-access \
; RUN: | FileCheck %s --check-prefixes=RV64-BOTH,RV64-FAST
+; RUN: llc < %s -mtriple=riscv32 -mattr=+m,+unaligned-scalar-mem \
+; RUN: | FileCheck %s --check-prefixes=RV32-BOTH,RV32-FAST
+; RUN: llc < %s -mtriple=riscv64 -mattr=+m,+unaligned-scalar-mem \
+; RUN: | FileCheck %s --check-prefixes=RV64-BOTH,RV64-FAST
%struct.x = type { i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, i8 }
declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) nounwind
diff --git a/llvm/test/CodeGen/RISCV/pr56110.ll
b/llvm/test/CodeGen/RISCV/pr56110.ll
index c795b17419f56..fcf3f691d56e0 100644
--- a/llvm/test/CodeGen/RISCV/pr56110.ll
+++ b/llvm/test/CodeGen/RISCV/pr56110.ll
@@ -1,6 +1,7 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=riscv32 | FileCheck %s
; RUN: llc < %s -mtriple=riscv32 -mattr=+fast-unaligned-access | FileCheck %s
+; RUN: llc < %s -mtriple=riscv32 -mattr=+unaligned-scalar-mem | FileCheck %s
define void @foo_set(ptr nocapture noundef %a, i32 noundef %v) {
; CHECK-LABEL: foo_set:
diff --git a/llvm/test/CodeGen/RISCV/unaligned-load-store.ll
b/llvm/test/CodeGen/RISCV/unaligned-load-store.ll
index 599b0d08629ea..641686dce97f6 100644
--- a/llvm/test/CodeGen/RISCV/unaligned-load-store.ll
+++ b/llvm/test/CodeGen/RISCV/unaligned-load-store.ll
@@ -7,6 +7,10 @@
; RUN: | FileCheck -check-prefixes=ALL,FAST,RV32I-FAST %s
; RUN: llc -mtriple=riscv64 -mattr=+fast-unaligned-access
-verify-machineinstrs < %s \
; RUN: | FileCheck -check-prefixes=ALL,FAST,RV64I-FAST %s
+; RUN: llc -mtriple=riscv32 -mattr=+unaligned-scalar-mem -verify-machineinstrs
< %s \
+; RUN: | FileCheck -check-prefixes=ALL,FAST,RV32I-FAST %s
+; RUN: llc -mtriple=riscv64 -mattr=+unaligned-scalar-mem -verify-machineinstrs
< %s \
+; RUN: | FileCheck -check-prefixes=ALL,FAST,RV64I-FAST %s
; A collection of cases showing codegen for unaligned loads and stores
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