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[AArch64][SME] Instcombine llvm.aarch64.sme.in.streaming.mode() #147930

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Merged
merged 3 commits into from
Jul 13, 2025
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[AArch64][SME] Instcombine llvm.aarch64.sme.in.streaming.mode() #147930

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[AArch64][SME] Instcombine `llvm.aarch64.sme.in.streaming.mode()`
MacDue Jul 10, 2025
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MacDue Jul 12, 2025
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Update llvm/test/Transforms/InstCombine/AArch64/aarch64-sme-in-stream…
MacDue Jul 12, 2025
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12 changes: 12 additions & 0 deletions llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2723,6 +2723,16 @@ static std::optional<Instruction *> instCombineSVEUxt(InstCombiner &IC,
return std::nullopt;
}

static std::optional<Instruction *>
instCombineInStreamingMode(InstCombiner &IC, IntrinsicInst &II) {
SMEAttrs FnSMEAttrs(*II.getFunction());
if (FnSMEAttrs.hasStreamingCompatibleInterface())
return std::nullopt;
bool IsStreaming = FnSMEAttrs.hasStreamingInterfaceOrBody();
return IC.replaceInstUsesWith(
II, ConstantInt::getBool(II.getType(), IsStreaming));
}

std::optional<Instruction *>
AArch64TTIImpl::instCombineIntrinsic(InstCombiner &IC,
IntrinsicInst &II) const {
Expand Down Expand Up @@ -2828,6 +2838,8 @@ AArch64TTIImpl::instCombineIntrinsic(InstCombiner &IC,
return instCombineSVEUxt(IC, II, 16);
case Intrinsic::aarch64_sve_uxtw:
return instCombineSVEUxt(IC, II, 32);
case Intrinsic::aarch64_sme_in_streaming_mode:
return instCombineInStreamingMode(IC, II);
}

return std::nullopt;
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38 changes: 38 additions & 0 deletions llvm/test/Transforms/InstCombine/AArch64/aarch64-sme-in-streaming-mode.ll
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@@ -0,0 +1,38 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -passes=instcombine -mtriple aarch64 -mattr=+sme -S -o - < %s | FileCheck %s

define i1 @test_in_streaming_mode_streaming_compatible() "aarch64_pstate_sm_compatible" {
; CHECK-LABEL: define i1 @test_in_streaming_mode_streaming_compatible(
; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: [[SM:%.*]] = tail call i1 @llvm.aarch64.sme.in.streaming.mode()
; CHECK-NEXT: ret i1 [[SM]]
;
%sm = tail call i1 @llvm.aarch64.sme.in.streaming.mode()
ret i1 %sm
}

define i1 @test_in_streaming_mode_streaming() "aarch64_pstate_sm_enabled" {
; CHECK-LABEL: define i1 @test_in_streaming_mode_streaming(
; CHECK-SAME: ) #[[ATTR1:[0-9]+]] {
; CHECK-NEXT: ret i1 true
;
%sm = tail call i1 @llvm.aarch64.sme.in.streaming.mode()
ret i1 %sm
}
define i1 @test_in_streaming_mode_streaming_body() "aarch64_pstate_sm_body" {
; CHECK-LABEL: define i1 @test_in_streaming_mode_streaming_body(
; CHECK-SAME: ) #[[ATTR2:[0-9]+]] {
; CHECK-NEXT: ret i1 true
;
%sm = tail call i1 @llvm.aarch64.sme.in.streaming.mode()
ret i1 %sm
}

define i1 @test_in_streaming_mode_non_streaming() {
; CHECK-LABEL: define i1 @test_in_streaming_mode_non_streaming(
; CHECK-SAME: ) #[[ATTR3:[0-9]+]] {
; CHECK-NEXT: ret i1 false
;
%sm = tail call i1 @llvm.aarch64.sme.in.streaming.mode()
ret i1 %sm
}
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