derek.holloway
7502bf64a4
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46 lines
1.8 KiB
LLVM
46 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64 -mattr=+sve < %s | FileCheck %s
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;
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; Ensure that the %ptrue from the preheader is sunk into the loop such that the ptest is removed.
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;
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define void @test_sink_ptrue_into_ptest(i32 %n) {
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; CHECK-LABEL: test_sink_ptrue_into_ptest:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: whilelt p0.s, wzr, w0
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; CHECK-NEXT: b.pl .LBB0_3
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; CHECK-NEXT: // %bb.1: // %for.body.preheader
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; CHECK-NEXT: mov w9, wzr
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; CHECK-NEXT: cntw x8
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; CHECK-NEXT: .LBB0_2: // %for.body
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; CHECK-NEXT: // =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: whilelt p0.s, w9, w0
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; CHECK-NEXT: add w9, w9, w8
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; CHECK-NEXT: b.mi .LBB0_2
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; CHECK-NEXT: .LBB0_3: // %exit
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; CHECK-NEXT: ret
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entry:
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%vscale = tail call i32 @llvm.vscale.i32()
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%step = shl nuw nsw i32 %vscale, 2
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%ptrue.ph = tail call <vscale x 4 x i1> @llvm.aarch64.sve.ptrue.nxv4i1(i32 31)
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%while.ph = tail call <vscale x 4 x i1> @llvm.aarch64.sve.whilelt.nxv4i1.i32(i32 0, i32 %n)
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%ptest.ph = tail call i1 @llvm.aarch64.sve.ptest.first.nxv4i1(<vscale x 4 x i1> %ptrue.ph, <vscale x 4 x i1> %while.ph)
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br i1 %ptest.ph, label %for.body, label %exit
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for.body:
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%i = phi i32 [ 0, %entry ], [ %i.next, %for.body ]
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%i.next = add i32 %i, %step
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%while = call <vscale x 4 x i1> @llvm.aarch64.sve.whilelt.nxv4i1.i32(i32 %i, i32 %n)
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%ptest = call i1 @llvm.aarch64.sve.ptest.first.nxv4i1(<vscale x 4 x i1> %ptrue.ph, <vscale x 4 x i1> %while)
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br i1 %ptest, label %for.body, label %exit
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exit:
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ret void
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}
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declare i32 @llvm.vscale.i32()
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declare <vscale x 4 x i1> @llvm.aarch64.sve.ptrue.nxv4i1(i32 immarg)
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declare <vscale x 4 x i1> @llvm.aarch64.sve.whilelt.nxv4i1.i32(i32, i32)
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declare i1 @llvm.aarch64.sve.ptest.first.nxv4i1(<vscale x 4 x i1>, <vscale x 4 x i1>)
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