72 lines
2.9 KiB
LLVM
72 lines
2.9 KiB
LLVM
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; RUN: llc < %s | FileCheck %s
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target triple = "aarch64"
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define void @dont_rematerialize_cntd(i32 %N) #0 {
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; CHECK-LABEL: dont_rematerialize_cntd:
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; CHECK: cntd
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; CHECK: smstop sm
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; CHECK-NOT: cntd
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; CHECK: bl foo
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; CHECK: smstart sm
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entry:
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%cmp2 = icmp sgt i32 %N, 0
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br i1 %cmp2, label %for.body, label %for.cond.cleanup
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for.body: ; preds = %entry, %for.body
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%index.03 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
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call void asm sideeffect "", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27}"() nounwind
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%.tr = call i32 @llvm.vscale.i32()
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%conv = shl nuw nsw i32 %.tr, 4
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call void @foo(i32 %conv)
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%inc = add nuw nsw i32 %index.03, 1
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%exitcond.not = icmp eq i32 %inc, %N
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
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for.cond.cleanup: ; preds = %for.body, %entry
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ret void
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}
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; This test doesn't strictly make sense, because it passes a scalable predicate
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; to a function, which makes little sense if the VL is not the same in/out of
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; streaming-SVE mode. If the VL is known to be the same, then we could just as
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; well rematerialize the `ptrue` inside the call sequence. However, the purpose
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; of this test is more to ensure that the logic works, which may also trigger
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; when the value is not being passed as argument (e.g. when it is hoisted from
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; a loop and placed inside the call sequence).
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;
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; FIXME: This test also exposes another bug, where the 'mul vl' addressing mode
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; is used before/after the smstop. This will be fixed in a future patch.
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define void @dont_rematerialize_ptrue(i32 %N) #0 {
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; CHECK-LABEL: dont_rematerialize_ptrue:
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; CHECK: ptrue [[PTRUE:p[0-9]+]].b
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; CHECK: str [[PTRUE]], [[[SPILL_ADDR:.*]]]
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; CHECK: smstop sm
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; CHECK: ldr p0, [[[SPILL_ADDR]]]
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; CHECK-NOT: ptrue
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; CHECK: bl bar
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; CHECK: smstart sm
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entry:
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%cmp2 = icmp sgt i32 %N, 0
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br i1 %cmp2, label %for.body, label %for.cond.cleanup
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for.body: ; preds = %entry, %for.body
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%index.03 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
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call void asm sideeffect "", "~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27}"() nounwind
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%ptrue.ins = insertelement <vscale x 16 x i1> poison, i1 1, i32 0
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%ptrue = shufflevector <vscale x 16 x i1> %ptrue.ins, <vscale x 16 x i1> poison, <vscale x 16 x i32> zeroinitializer
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call void @bar(<vscale x 16 x i1> %ptrue)
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%inc = add nuw nsw i32 %index.03, 1
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%exitcond.not = icmp eq i32 %inc, %N
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
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for.cond.cleanup: ; preds = %for.body, %entry
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ret void
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}
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declare void @foo(i32)
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declare void @bar(<vscale x 16 x i1>)
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declare i32 @llvm.vscale.i32()
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attributes #0 = { "aarch64_pstate_sm_enabled" "frame-pointer"="non-leaf" "target-features"="+sme,+sve" }
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