mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-10-04 16:01:46 +00:00
319d594e22
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
61 lines
1.8 KiB
LLVM
61 lines
1.8 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-width=4 -enable-if-conversion -dce -instcombine -licm -S | 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-macosx10.9.0"
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; This is the loop in this example:
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;
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;int function0(int *a, int *b, int start, int end) {
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;
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; for (int i=start; i<end; ++i) {
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; unsigned k = a[i];
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;
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; if (a[i] > b[i]) <------ notice the IF inside the loop.
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; k = k * 5 + 3;
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;
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; a[i] = k; <---- K is a phi node that becomes vector-select.
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; }
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;}
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;CHECK: @function0
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;CHECK: load <4 x i32>
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;CHECK: icmp sgt <4 x i32>
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;CHECK: mul <4 x i32>
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;CHECK: add <4 x i32>
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;CHECK: select <4 x i1>
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;CHECK: ret i32
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define i32 @function0(i32* nocapture %a, i32* nocapture %b, i32 %start, i32 %end) nounwind uwtable ssp {
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entry:
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%cmp16 = icmp slt i32 %start, %end
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br i1 %cmp16, label %for.body.lr.ph, label %for.end
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for.body.lr.ph:
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%0 = sext i32 %start to i64
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br label %for.body
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for.body:
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%indvars.iv = phi i64 [ %0, %for.body.lr.ph ], [ %indvars.iv.next, %if.end ]
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%arrayidx = getelementptr inbounds i32* %a, i64 %indvars.iv
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%1 = load i32* %arrayidx, align 4
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%arrayidx4 = getelementptr inbounds i32* %b, i64 %indvars.iv
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%2 = load i32* %arrayidx4, align 4
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%cmp5 = icmp sgt i32 %1, %2
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br i1 %cmp5, label %if.then, label %if.end
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if.then:
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%mul = mul i32 %1, 5
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%add = add i32 %mul, 3
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br label %if.end
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if.end:
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%k.0 = phi i32 [ %add, %if.then ], [ %1, %for.body ]
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store i32 %k.0, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%3 = trunc i64 %indvars.iv.next to i32
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%cmp = icmp slt i32 %3, %end
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br i1 %cmp, label %for.body, label %for.end
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for.end:
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ret i32 undef
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}
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