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release/21.x: [HEXAGON] Add AssertSext in sign-extended mpy (#149061) #149773

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merged 1 commit into from
Jul 22, 2025
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release/21.x: [HEXAGON] Add AssertSext in sign-extended mpy (#149061) #149773

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9 changes: 9 additions & 0 deletions llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1640,6 +1640,15 @@ bool HexagonDAGToDAGISel::DetectUseSxtw(SDValue &N, SDValue &R) {
R = N;
break;
}
case ISD::AssertSext: {
EVT T = cast<VTSDNode>(N.getOperand(1))->getVT();
if (T.getSizeInBits() == 32)
R = N.getOperand(0);
else
return false;
break;
}

default:
return false;
}
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38 changes: 38 additions & 0 deletions llvm/test/CodeGen/Hexagon/mpy-operand-hoist.ll
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@@ -0,0 +1,38 @@
; RUN: llc -march=hexagon -verify-machineinstrs < %s | FileCheck %s

; CHECK-NOT: r{{[0-9]+}} = asr(r{{[0-9]+}},#{{[0-9]+}})
; CHECK-NOT: r{{[0-9]+}}:{{[0-9]+}} = mpyu(r{{[0-9]+}},r{{[0-9]+}})
; CHECK-NOT: r{{[0-9]+}} += mpyi(r{{[0-9]+}},r{{[0-9]+}})
; CHECK: r{{[0-9]+}}:{{[0-9]+}} = mpy(r{{[0-9]+}},r{{[0-9]+}})

; ModuleID = '39544.c'
source_filename = "39544.c"
target datalayout = "e-m:e-p:32:32:32-a:0-n16:32-i64:64:64-i32:32:32-i16:16:16-i1:8:8-f32:32:32-f64:64:64-v32:32:32-v64:64:64-v512:512:512-v1024:1024:1024-v2048:2048:2048"
target triple = "hexagon"

define dso_local void @mul_n(i64* nocapture %p, i32* nocapture readonly %a, i32 %k, i32 %n) local_unnamed_addr {
entry:
%cmp7 = icmp sgt i32 %n, 0
br i1 %cmp7, label %for.body.lr.ph, label %for.cond.cleanup

for.body.lr.ph: ; preds = %entry
%conv1 = sext i32 %k to i64
br label %for.body

for.cond.cleanup: ; preds = %for.body, %entry
ret void

for.body: ; preds = %for.body, %for.body.lr.ph
%arrayidx.phi = phi i32* [ %a, %for.body.lr.ph ], [ %arrayidx.inc, %for.body ]
%arrayidx2.phi = phi i64* [ %p, %for.body.lr.ph ], [ %arrayidx2.inc, %for.body ]
%i.08 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%0 = load i32, i32* %arrayidx.phi, align 4
%conv = sext i32 %0 to i64
%mul = mul nsw i64 %conv, %conv1
store i64 %mul, i64* %arrayidx2.phi, align 8
%inc = add nuw nsw i32 %i.08, 1
%exitcond = icmp eq i32 %inc, %n
%arrayidx.inc = getelementptr i32, i32* %arrayidx.phi, i32 1
%arrayidx2.inc = getelementptr i64, i64* %arrayidx2.phi, i32 1
br i1 %exitcond, label %for.cond.cleanup, label %for.body
}
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