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97fe0281b4
By supporting the vectorization of PHINodes with more than two incoming values we can increase the complexity of nested if statements.
We can now vectorize this loop:
int foo(int *A, int *B, int n) {
for (int i=0; i < n; i++) {
int x = 9;
if (A[i] > B[i]) {
if (A[i] > 19) {
x = 3;
} else if (B[i] < 4 ) {
x = 4;
} else {
x = 5;
}
}
A[i] = x;
}
}
llvm-svn: 181037
49 lines
1.6 KiB
LLVM
49 lines
1.6 KiB
LLVM
; RUN: opt < %s -loop-vectorize -force-vector-unroll=1 -force-vector-width=4 -enable-if-conversion -dce -instcombine -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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;CHECK: @foo
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;CHECK: icmp sgt
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;CHECK: icmp sgt
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;CHECK: icmp slt
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;CHECK: select <4 x i1>
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;CHECK: %[[P1:.*]] = select <4 x i1>
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;CHECK: xor <4 x i1>
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;CHECK: and <4 x i1>
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;CHECK: select <4 x i1> %{{.*}}, <4 x i32> %{{.*}}, <4 x i32> %[[P1]]
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;CHECK: ret
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define i32 @foo(i32* nocapture %A, i32* nocapture %B, i32 %n) {
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entry:
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%cmp26 = icmp sgt i32 %n, 0
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br i1 %cmp26, label %for.body, label %for.end
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for.body:
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%indvars.iv = phi i64 [ %indvars.iv.next, %if.end14 ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i32* %A, i64 %indvars.iv
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%0 = load i32* %arrayidx, align 4
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%arrayidx2 = getelementptr inbounds i32* %B, i64 %indvars.iv
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%1 = load i32* %arrayidx2, align 4
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%cmp3 = icmp sgt i32 %0, %1
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br i1 %cmp3, label %if.then, label %if.end14
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if.then:
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%cmp6 = icmp sgt i32 %0, 19
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br i1 %cmp6, label %if.end14, label %if.else
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if.else:
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%cmp10 = icmp slt i32 %1, 4
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%. = select i1 %cmp10, i32 4, i32 5
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br label %if.end14
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if.end14:
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%x.0 = phi i32 [ 9, %for.body ], [ 3, %if.then ], [ %., %if.else ] ; <------------- A PHI with 3 entries that we can still vectorize.
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store i32 %x.0, i32* %arrayidx, align 4
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body
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for.end:
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ret i32 undef
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}
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