[llvm-branch-commits] [llvm] release/19.x: [AArch64] Avoid NEON dot product in streaming[-compatible] functions (#101677) (PR #101933)
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Mon Aug 5 01:01:20 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-aarch64
Author: None (llvmbot)
<details>
<summary>Changes</summary>
Backport 12937b1bfb23cca4731fa274f3358f7286cc6784
Requested by: @<!-- -->sdesmalen-arm
---
Full diff: https://github.com/llvm/llvm-project/pull/101933.diff
2 Files Affected:
- (modified) llvm/lib/Target/AArch64/AArch64ISelLowering.cpp (+3)
- (added) llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-reductions.ll (+143)
``````````diff
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 6d413a09407a9..62078822c89b1 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -17719,6 +17719,9 @@ static SDValue performVecReduceAddCombineWithUADDLP(SDNode *N,
// and generate vecreduce.add(concat_vector(DOT, DOT2, ..)).
static SDValue performVecReduceAddCombine(SDNode *N, SelectionDAG &DAG,
const AArch64Subtarget *ST) {
+ if (!ST->isNeonAvailable())
+ return SDValue();
+
if (!ST->hasDotProd())
return performVecReduceAddCombineWithUADDLP(N, DAG);
diff --git a/llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-reductions.ll b/llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-reductions.ll
new file mode 100644
index 0000000000000..00a15f4bcd639
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/sve-streaming-mode-fixed-length-reductions.ll
@@ -0,0 +1,143 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mattr=+sve < %s | FileCheck %s
+; RUN: llc -mattr=+dotprod,+sve < %s | FileCheck %s -check-prefix=DOT
+; RUN: llc -mattr=+dotprod,+sve -force-streaming-compatible < %s | FileCheck %s --check-prefix=STREAMING-SVE
+; RUN: llc -mattr=+dotprod,+sme -force-streaming < %s | FileCheck %s --check-prefix=STREAMING-SVE
+
+target triple = "aarch64-unknown-linux-gnu"
+
+define i32 @reduce_uaddv_v16i8(<32 x i8> %a) {
+; CHECK-LABEL: reduce_uaddv_v16i8:
+; CHECK: // %bb.0:
+; CHECK-NEXT: ushll2 v2.8h, v1.16b, #0
+; CHECK-NEXT: ushll2 v3.8h, v0.16b, #0
+; CHECK-NEXT: ushll v1.8h, v1.8b, #0
+; CHECK-NEXT: ushll v0.8h, v0.8b, #0
+; CHECK-NEXT: uaddl2 v4.4s, v3.8h, v2.8h
+; CHECK-NEXT: uaddl v2.4s, v3.4h, v2.4h
+; CHECK-NEXT: uaddl2 v5.4s, v0.8h, v1.8h
+; CHECK-NEXT: uaddl v0.4s, v0.4h, v1.4h
+; CHECK-NEXT: add v1.4s, v5.4s, v4.4s
+; CHECK-NEXT: add v0.4s, v0.4s, v2.4s
+; CHECK-NEXT: add v0.4s, v0.4s, v1.4s
+; CHECK-NEXT: addv s0, v0.4s
+; CHECK-NEXT: fmov w0, s0
+; CHECK-NEXT: ret
+;
+; DOT-LABEL: reduce_uaddv_v16i8:
+; DOT: // %bb.0:
+; DOT-NEXT: movi v2.16b, #1
+; DOT-NEXT: movi v3.2d, #0000000000000000
+; DOT-NEXT: udot v3.4s, v1.16b, v2.16b
+; DOT-NEXT: udot v3.4s, v0.16b, v2.16b
+; DOT-NEXT: addv s0, v3.4s
+; DOT-NEXT: fmov w0, s0
+; DOT-NEXT: ret
+;
+; STREAMING-SVE-LABEL: reduce_uaddv_v16i8:
+; STREAMING-SVE: // %bb.0:
+; STREAMING-SVE-NEXT: // kill: def $q1 killed $q1 def $z1
+; STREAMING-SVE-NEXT: uunpklo z2.h, z1.b
+; STREAMING-SVE-NEXT: // kill: def $q0 killed $q0 def $z0
+; STREAMING-SVE-NEXT: uunpklo z3.h, z0.b
+; STREAMING-SVE-NEXT: ptrue p0.s, vl4
+; STREAMING-SVE-NEXT: ext z1.b, z1.b, z1.b, #8
+; STREAMING-SVE-NEXT: ext z0.b, z0.b, z0.b, #8
+; STREAMING-SVE-NEXT: uunpklo z1.h, z1.b
+; STREAMING-SVE-NEXT: uunpklo z0.h, z0.b
+; STREAMING-SVE-NEXT: uunpklo z4.s, z2.h
+; STREAMING-SVE-NEXT: ext z2.b, z2.b, z2.b, #8
+; STREAMING-SVE-NEXT: uunpklo z6.s, z3.h
+; STREAMING-SVE-NEXT: ext z3.b, z3.b, z3.b, #8
+; STREAMING-SVE-NEXT: mov z5.d, z1.d
+; STREAMING-SVE-NEXT: uunpklo z7.s, z0.h
+; STREAMING-SVE-NEXT: ext z0.b, z0.b, z0.b, #8
+; STREAMING-SVE-NEXT: uunpklo z2.s, z2.h
+; STREAMING-SVE-NEXT: uunpklo z3.s, z3.h
+; STREAMING-SVE-NEXT: add z4.s, z6.s, z4.s
+; STREAMING-SVE-NEXT: ext z5.b, z5.b, z1.b, #8
+; STREAMING-SVE-NEXT: uunpklo z1.s, z1.h
+; STREAMING-SVE-NEXT: uunpklo z0.s, z0.h
+; STREAMING-SVE-NEXT: add z2.s, z3.s, z2.s
+; STREAMING-SVE-NEXT: uunpklo z5.s, z5.h
+; STREAMING-SVE-NEXT: add z1.s, z7.s, z1.s
+; STREAMING-SVE-NEXT: add z0.s, z0.s, z5.s
+; STREAMING-SVE-NEXT: add z1.s, z4.s, z1.s
+; STREAMING-SVE-NEXT: add z0.s, z2.s, z0.s
+; STREAMING-SVE-NEXT: add z0.s, z1.s, z0.s
+; STREAMING-SVE-NEXT: uaddv d0, p0, z0.s
+; STREAMING-SVE-NEXT: fmov x0, d0
+; STREAMING-SVE-NEXT: // kill: def $w0 killed $w0 killed $x0
+; STREAMING-SVE-NEXT: ret
+ %1 = zext <32 x i8> %a to <32 x i32>
+ %2 = call i32 @llvm.vector.reduce.add.v32i32(<32 x i32> %1)
+ ret i32 %2
+}
+
+define i32 @reduce_saddv_v16i8(<32 x i8> %a) {
+; CHECK-LABEL: reduce_saddv_v16i8:
+; CHECK: // %bb.0:
+; CHECK-NEXT: sshll2 v2.8h, v1.16b, #0
+; CHECK-NEXT: sshll2 v3.8h, v0.16b, #0
+; CHECK-NEXT: sshll v1.8h, v1.8b, #0
+; CHECK-NEXT: sshll v0.8h, v0.8b, #0
+; CHECK-NEXT: saddl2 v4.4s, v3.8h, v2.8h
+; CHECK-NEXT: saddl v2.4s, v3.4h, v2.4h
+; CHECK-NEXT: saddl2 v5.4s, v0.8h, v1.8h
+; CHECK-NEXT: saddl v0.4s, v0.4h, v1.4h
+; CHECK-NEXT: add v1.4s, v5.4s, v4.4s
+; CHECK-NEXT: add v0.4s, v0.4s, v2.4s
+; CHECK-NEXT: add v0.4s, v0.4s, v1.4s
+; CHECK-NEXT: addv s0, v0.4s
+; CHECK-NEXT: fmov w0, s0
+; CHECK-NEXT: ret
+;
+; DOT-LABEL: reduce_saddv_v16i8:
+; DOT: // %bb.0:
+; DOT-NEXT: movi v2.16b, #1
+; DOT-NEXT: movi v3.2d, #0000000000000000
+; DOT-NEXT: sdot v3.4s, v1.16b, v2.16b
+; DOT-NEXT: sdot v3.4s, v0.16b, v2.16b
+; DOT-NEXT: addv s0, v3.4s
+; DOT-NEXT: fmov w0, s0
+; DOT-NEXT: ret
+;
+; STREAMING-SVE-LABEL: reduce_saddv_v16i8:
+; STREAMING-SVE: // %bb.0:
+; STREAMING-SVE-NEXT: // kill: def $q1 killed $q1 def $z1
+; STREAMING-SVE-NEXT: sunpklo z2.h, z1.b
+; STREAMING-SVE-NEXT: // kill: def $q0 killed $q0 def $z0
+; STREAMING-SVE-NEXT: sunpklo z3.h, z0.b
+; STREAMING-SVE-NEXT: ptrue p0.s, vl4
+; STREAMING-SVE-NEXT: ext z1.b, z1.b, z1.b, #8
+; STREAMING-SVE-NEXT: ext z0.b, z0.b, z0.b, #8
+; STREAMING-SVE-NEXT: sunpklo z1.h, z1.b
+; STREAMING-SVE-NEXT: sunpklo z0.h, z0.b
+; STREAMING-SVE-NEXT: sunpklo z4.s, z2.h
+; STREAMING-SVE-NEXT: ext z2.b, z2.b, z2.b, #8
+; STREAMING-SVE-NEXT: sunpklo z6.s, z3.h
+; STREAMING-SVE-NEXT: ext z3.b, z3.b, z3.b, #8
+; STREAMING-SVE-NEXT: mov z5.d, z1.d
+; STREAMING-SVE-NEXT: sunpklo z7.s, z0.h
+; STREAMING-SVE-NEXT: ext z0.b, z0.b, z0.b, #8
+; STREAMING-SVE-NEXT: sunpklo z2.s, z2.h
+; STREAMING-SVE-NEXT: sunpklo z3.s, z3.h
+; STREAMING-SVE-NEXT: add z4.s, z6.s, z4.s
+; STREAMING-SVE-NEXT: ext z5.b, z5.b, z1.b, #8
+; STREAMING-SVE-NEXT: sunpklo z1.s, z1.h
+; STREAMING-SVE-NEXT: sunpklo z0.s, z0.h
+; STREAMING-SVE-NEXT: add z2.s, z3.s, z2.s
+; STREAMING-SVE-NEXT: sunpklo z5.s, z5.h
+; STREAMING-SVE-NEXT: add z1.s, z7.s, z1.s
+; STREAMING-SVE-NEXT: add z0.s, z0.s, z5.s
+; STREAMING-SVE-NEXT: add z1.s, z4.s, z1.s
+; STREAMING-SVE-NEXT: add z0.s, z2.s, z0.s
+; STREAMING-SVE-NEXT: add z0.s, z1.s, z0.s
+; STREAMING-SVE-NEXT: uaddv d0, p0, z0.s
+; STREAMING-SVE-NEXT: fmov x0, d0
+; STREAMING-SVE-NEXT: // kill: def $w0 killed $w0 killed $x0
+; STREAMING-SVE-NEXT: ret
+ %1 = sext <32 x i8> %a to <32 x i32>
+ %2 = call i32 @llvm.vector.reduce.add.v32i32(<32 x i32> %1)
+ ret i32 %2
+}
``````````
</details>
https://github.com/llvm/llvm-project/pull/101933
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