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LoopVectorize: convert TinyTripCountVectorThreshold constant

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to a command line switch.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173837 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pekka Jaaskelainen 2013-01-29 21:42:08 +00:00
parent 485da64848
commit d855049576
2 changed files with 31 additions and 1 deletions
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4
lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -101,7 +101,9 @@ EnableIfConversion("enable-if-conversion", cl::init(true), cl::Hidden,
cl::desc("Enable if-conversion during vectorization."));
/// We don't vectorize loops with a known constant trip count below this number.
static const unsigned TinyTripCountVectorThreshold = 16;
static cl::opt<unsigned>
TinyTripCountVectorThreshold("vectorizer-min-trip-count", cl::init(16), cl::Hidden,
cl::desc("The minimum trip count in the loops to vectorize."));
/// We don't unroll loops with a known constant trip count below this number.
static const unsigned TinyTripCountUnrollThreshold = 128;

28
test/Transforms/LoopVectorize/min-trip-count-switch.ll Normal file
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@ -0,0 +1,28 @@
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -vectorizer-min-trip-count=1 -force-vector-width=4 -dce -instcombine -S | FileCheck %s
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"
target triple = "x86_64-unknown-linux-gnu"
; CHECK: <4 x float>
define void @trivial_loop(float* nocapture %a) nounwind uwtable optsize {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds float* %a, i64 %indvars.iv
%0 = load float* %arrayidx, align 4, !tbaa !0
%add = fadd float %0, 1.000000e+00
store float %add, float* %arrayidx, align 4, !tbaa !0
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, 8
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
!0 = metadata !{metadata !"float", metadata !1}
!1 = metadata !{metadata !"omnipotent char", metadata !2}
!2 = metadata !{metadata !"Simple C/C++ TBAA"}