[llvm] [LoongArch] Enable interleaved vectorization (PR #92629)
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Fri May 17 19:29:21 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-loongarch
Author: hev (heiher)
<details>
<summary>Changes</summary>
This PR enables interleaved vectorization for LoongArch, with a default interleaving factor of `2`.
---
Full diff: https://github.com/llvm/llvm-project/pull/92629.diff
5 Files Affected:
- (modified) llvm/lib/Target/LoongArch/LoongArchSubtarget.h (+2)
- (modified) llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp (+4)
- (modified) llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h (+1)
- (modified) llvm/test/Transforms/LoopVectorize/LoongArch/defaults.ll (+14-8)
- (added) llvm/test/Transforms/LoopVectorize/LoongArch/loongarch-interleaved.ll (+39)
``````````diff
diff --git a/llvm/lib/Target/LoongArch/LoongArchSubtarget.h b/llvm/lib/Target/LoongArch/LoongArchSubtarget.h
index b87ea6e2ec32b..390ce45552db5 100644
--- a/llvm/lib/Target/LoongArch/LoongArchSubtarget.h
+++ b/llvm/lib/Target/LoongArch/LoongArchSubtarget.h
@@ -37,6 +37,7 @@ class LoongArchSubtarget : public LoongArchGenSubtargetInfo {
#include "LoongArchGenSubtargetInfo.inc"
unsigned GRLen = 32;
+ uint8_t MaxInterleaveFactor = 2;
MVT GRLenVT = MVT::i32;
LoongArchABI::ABI TargetABI = LoongArchABI::ABI_Unknown;
LoongArchFrameLowering FrameLowering;
@@ -99,6 +100,7 @@ class LoongArchSubtarget : public LoongArchGenSubtargetInfo {
Align getPrefFunctionAlignment() const { return PrefFunctionAlignment; }
Align getPrefLoopAlignment() const { return PrefLoopAlignment; }
unsigned getMaxBytesForAlignment() const { return MaxBytesForAlignment; }
+ unsigned getMaxInterleaveFactor() const { return MaxInterleaveFactor; }
bool enableMachineScheduler() const override { return true; }
};
} // end namespace llvm
diff --git a/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp b/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp
index add1c60d89d21..710650acba304 100644
--- a/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.cpp
@@ -69,6 +69,10 @@ unsigned LoongArchTTIImpl::getRegisterClassForType(bool Vector,
return LoongArchRegisterClass::GPRRC;
}
+unsigned LoongArchTTIImpl::getMaxInterleaveFactor(ElementCount VF) {
+ return ST->getMaxInterleaveFactor();
+}
+
const char *LoongArchTTIImpl::getRegisterClassName(unsigned ClassID) const {
switch (ClassID) {
case LoongArchRegisterClass::GPRRC:
diff --git a/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h b/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h
index 34c18163bbdb6..06a03d29931d1 100644
--- a/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h
+++ b/llvm/lib/Target/LoongArch/LoongArchTargetTransformInfo.h
@@ -43,6 +43,7 @@ class LoongArchTTIImpl : public BasicTTIImplBase<LoongArchTTIImpl> {
TypeSize getRegisterBitWidth(TargetTransformInfo::RegisterKind K) const;
unsigned getNumberOfRegisters(unsigned ClassID) const;
unsigned getRegisterClassForType(bool Vector, Type *Ty = nullptr) const;
+ unsigned getMaxInterleaveFactor(ElementCount VF);
const char *getRegisterClassName(unsigned ClassID) const;
// TODO: Implement more hooks to provide TTI machinery for LoongArch.
diff --git a/llvm/test/Transforms/LoopVectorize/LoongArch/defaults.ll b/llvm/test/Transforms/LoopVectorize/LoongArch/defaults.ll
index 7172f0907e77e..28c1eef84e257 100644
--- a/llvm/test/Transforms/LoopVectorize/LoongArch/defaults.ll
+++ b/llvm/test/Transforms/LoopVectorize/LoongArch/defaults.ll
@@ -22,14 +22,20 @@ define void @vector_add(ptr noalias nocapture %a, i64 %v) {
; CHECK: vector.body:
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[INDEX]], 0
-; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP0]]
-; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[TMP1]], i32 0
-; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP2]], align 8
-; CHECK-NEXT: [[TMP3:%.*]] = add <4 x i64> [[WIDE_LOAD]], [[BROADCAST_SPLAT]]
-; CHECK-NEXT: store <4 x i64> [[TMP3]], ptr [[TMP2]], align 8
-; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
-; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
-; CHECK-NEXT: br i1 [[TMP4]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
+; CHECK-NEXT: [[TMP1:%.*]] = add i64 [[INDEX]], 4
+; CHECK-NEXT: [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP0]]
+; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds i64, ptr [[A]], i64 [[TMP1]]
+; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 0
+; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds i64, ptr [[TMP2]], i32 4
+; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i64>, ptr [[TMP4]], align 8
+; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <4 x i64>, ptr [[TMP5]], align 8
+; CHECK-NEXT: [[TMP6:%.*]] = add <4 x i64> [[WIDE_LOAD]], [[BROADCAST_SPLAT]]
+; CHECK-NEXT: [[TMP7:%.*]] = add <4 x i64> [[WIDE_LOAD1]], [[BROADCAST_SPLAT]]
+; CHECK-NEXT: store <4 x i64> [[TMP6]], ptr [[TMP4]], align 8
+; CHECK-NEXT: store <4 x i64> [[TMP7]], ptr [[TMP5]], align 8
+; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
+; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1024
+; CHECK-NEXT: br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: middle.block:
; CHECK-NEXT: br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; CHECK: scalar.ph:
diff --git a/llvm/test/Transforms/LoopVectorize/LoongArch/loongarch-interleaved.ll b/llvm/test/Transforms/LoopVectorize/LoongArch/loongarch-interleaved.ll
new file mode 100644
index 0000000000000..be9b170491b9c
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/LoongArch/loongarch-interleaved.ll
@@ -0,0 +1,39 @@
+; REQUIRES: asserts
+; RUN: opt --passes=loop-vectorize,dce,instcombine --mtriple loongarch64 \
+; RUN: -S < %s 2>&1 | FileCheck %s
+
+; CHECK-LABEL: foo
+; CHECK: %{{.*}} = add {{.*}}, 2
+
+; Function Attrs: nofree norecurse nosync nounwind writeonly
+define dso_local void @foo(i32 signext %n, ptr nocapture %A) local_unnamed_addr #0 {
+entry:
+ %cmp5 = icmp sgt i32 %n, 0
+ br i1 %cmp5, label %for.body.preheader, label %for.cond.cleanup
+
+for.body.preheader: ; preds = %entry
+ %wide.trip.count = zext i32 %n to i64
+ br label %for.body
+
+for.cond.cleanup.loopexit: ; preds = %for.body
+ br label %for.cond.cleanup
+
+for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
+ ret void
+
+for.body: ; preds = %for.body.preheader, %for.body
+ %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
+ %arrayidx = getelementptr inbounds i32, ptr %A, i64 %indvars.iv
+ %0 = trunc i64 %indvars.iv to i32
+ store i32 %0, ptr %arrayidx, align 4, !tbaa !4
+ %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+ %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
+ br i1 %exitcond.not, label %for.cond.cleanup.loopexit, label %for.body, !llvm.loop !8
+}
+
+!4 = !{!5, !5, i64 0}
+!5 = !{!"int", !6, i64 0}
+!6 = !{!"omnipotent char", !7, i64 0}
+!7 = !{!"Simple C/C++ TBAA"}
+!8 = distinct !{!8, !9}
+!9 = !{!"llvm.loop.mustprogress"}
``````````
</details>
https://github.com/llvm/llvm-project/pull/92629
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