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Add the last part that is needed for vectorization of if-converted code.

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Added the code that actually performs the if-conversion during vectorization.

We can now vectorize this code:

for (int i=0; i<n; ++i) {
  unsigned k = 0;

  if (a[i] > b[i])   <------ IF inside the loop.
    k = k * 5 + 3;

  a[i] = k;          <---- K is a phi node that becomes vector-select.
}



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169217 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-12-04 06:15:11 +00:00
parent 6c55412ea4
commit 319d594e22
2 changed files with 394 additions and 245 deletions
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test/Transforms/LoopVectorize/if-conversion.ll
+60
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@@ -0,0 +1,60 @@
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -enable-if-conversion -dce -instcombine -licm -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-apple-macosx10.9.0"
; This is the loop in this example:
;
;int function0(int *a, int *b, int start, int end) {
;
; for (int i=start; i<end; ++i) {
; unsigned k = a[i];
;
; if (a[i] > b[i]) <------ notice the IF inside the loop.
; k = k * 5 + 3;
;
; a[i] = k; <---- K is a phi node that becomes vector-select.
; }
;}
;CHECK: @function0
;CHECK: load <4 x i32>
;CHECK: icmp sgt <4 x i32>
;CHECK: mul <4 x i32>
;CHECK: add <4 x i32>
;CHECK: select <4 x i1>
;CHECK: ret i32
define i32 @function0(i32* nocapture %a, i32* nocapture %b, i32 %start, i32 %end) nounwind uwtable ssp {
entry:
%cmp16 = icmp slt i32 %start, %end
br i1 %cmp16, label %for.body.lr.ph, label %for.end
for.body.lr.ph:
%0 = sext i32 %start to i64
br label %for.body
for.body:
%indvars.iv = phi i64 [ %0, %for.body.lr.ph ], [ %indvars.iv.next, %if.end ]
%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
%1 = load i32* %arrayidx, align 4
%arrayidx4 = getelementptr inbounds i32* %b, i64 %indvars.iv
%2 = load i32* %arrayidx4, align 4
%cmp5 = icmp sgt i32 %1, %2
br i1 %cmp5, label %if.then, label %if.end
if.then:
%mul = mul i32 %1, 5
%add = add i32 %mul, 3
br label %if.end
if.end:
%k.0 = phi i32 [ %add, %if.then ], [ %1, %for.body ]
store i32 %k.0, i32* %arrayidx, align 4
%indvars.iv.next = add i64 %indvars.iv, 1
%3 = trunc i64 %indvars.iv.next to i32
%cmp = icmp slt i32 %3, %end
br i1 %cmp, label %for.body, label %for.end
for.end:
ret i32 undef
}