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https://github.com/c64scene-ar/llvm-6502.git
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994b4c784f
Runtime unrolling is an expensive optimization which can bring benefit only if the loop is hot and iteration number is relatively large enough. For some loops, we know they are not worth to be runtime unrolled. The scalar loop from vectorization is one of the cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231631 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
3.3 KiB
LLVM
79 lines
3.3 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce -instcombine -S -simplifycfg | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.8.0"
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;
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; We want to make sure that we are vectorizeing the scalar loop only once
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; even if the pass manager runs the vectorizer multiple times due to inlining.
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; This test checks that we add metadata to vectorized loops
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; CHECK-LABEL: @_Z4foo1Pii(
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; CHECK: <4 x i32>
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; CHECK: llvm.loop
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; CHECK: ret
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; This test comes from the loop:
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;
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;int foo (int *A, int n) {
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; return std::accumulate(A, A + n, 0);
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;}
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define i32 @_Z4foo1Pii(i32* %A, i32 %n) #0 {
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entry:
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%idx.ext = sext i32 %n to i64
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%add.ptr = getelementptr inbounds i32, i32* %A, i64 %idx.ext
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%cmp3.i = icmp eq i32 %n, 0
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br i1 %cmp3.i, label %_ZSt10accumulateIPiiET0_T_S2_S1_.exit, label %for.body.i
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for.body.i: ; preds = %entry, %for.body.i
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%__init.addr.05.i = phi i32 [ %add.i, %for.body.i ], [ 0, %entry ]
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%__first.addr.04.i = phi i32* [ %incdec.ptr.i, %for.body.i ], [ %A, %entry ]
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%0 = load i32, i32* %__first.addr.04.i, align 4
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%add.i = add nsw i32 %0, %__init.addr.05.i
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%incdec.ptr.i = getelementptr inbounds i32, i32* %__first.addr.04.i, i64 1
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%cmp.i = icmp eq i32* %incdec.ptr.i, %add.ptr
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br i1 %cmp.i, label %_ZSt10accumulateIPiiET0_T_S2_S1_.exit, label %for.body.i
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_ZSt10accumulateIPiiET0_T_S2_S1_.exit: ; preds = %for.body.i, %entry
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%__init.addr.0.lcssa.i = phi i32 [ 0, %entry ], [ %add.i, %for.body.i ]
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ret i32 %__init.addr.0.lcssa.i
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}
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; This test checks that we don't vectorize loops that are marked with the "width" == 1 metadata.
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; CHECK-LABEL: @_Z4foo2Pii(
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; CHECK-NOT: <4 x i32>
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; CHECK: llvm.loop
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; CHECK: ret
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define i32 @_Z4foo2Pii(i32* %A, i32 %n) #0 {
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entry:
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%idx.ext = sext i32 %n to i64
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%add.ptr = getelementptr inbounds i32, i32* %A, i64 %idx.ext
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%cmp3.i = icmp eq i32 %n, 0
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br i1 %cmp3.i, label %_ZSt10accumulateIPiiET0_T_S2_S1_.exit, label %for.body.i
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for.body.i: ; preds = %entry, %for.body.i
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%__init.addr.05.i = phi i32 [ %add.i, %for.body.i ], [ 0, %entry ]
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%__first.addr.04.i = phi i32* [ %incdec.ptr.i, %for.body.i ], [ %A, %entry ]
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%0 = load i32, i32* %__first.addr.04.i, align 4
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%add.i = add nsw i32 %0, %__init.addr.05.i
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%incdec.ptr.i = getelementptr inbounds i32, i32* %__first.addr.04.i, i64 1
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%cmp.i = icmp eq i32* %incdec.ptr.i, %add.ptr
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br i1 %cmp.i, label %_ZSt10accumulateIPiiET0_T_S2_S1_.exit, label %for.body.i, !llvm.loop !0
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_ZSt10accumulateIPiiET0_T_S2_S1_.exit: ; preds = %for.body.i, %entry
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%__init.addr.0.lcssa.i = phi i32 [ 0, %entry ], [ %add.i, %for.body.i ]
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ret i32 %__init.addr.0.lcssa.i
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}
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attributes #0 = { nounwind readonly ssp uwtable "fp-contract-model"="standard" "no-frame-pointer-elim" "no-frame-pointer-elim-non-leaf" "realign-stack" "relocation-model"="pic" "ssp-buffers-size"="8" }
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; CHECK: !0 = distinct !{!0, !1, !2}
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; CHECK: !1 = !{!"llvm.loop.vectorize.width", i32 1}
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; CHECK: !2 = !{!"llvm.loop.interleave.count", i32 1}
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; CHECK: !3 = distinct !{!3, !4, !1, !2}
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; CHECK: !4 = !{!"llvm.loop.unroll.runtime.disable"}
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!0 = !{!0, !1}
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!1 = !{!"llvm.loop.vectorize.width", i32 1}
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