loop-legality-checks.ll
2.19 KB
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; RUN: opt < %s -loop-vectorize -debug-only=loop-vectorize -S -disable-output 2>&1 | FileCheck %s
; REQUIRES: asserts
; Make sure LV legal bails out when the exiting block != loop latch.
; CHECK-LABEL: "latch_is_not_exiting"
; CHECK: LV: Not vectorizing: The exiting block is not the loop latch.
define i32 @latch_is_not_exiting() {
entry:
br label %for.body
for.body:
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ], [%inc, %for.second]
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, 16
br i1 %cmp, label %for.body, label %for.second
for.second:
%cmps = icmp sgt i32 %inc, 16
br i1 %cmps, label %for.body, label %for.end
for.end:
ret i32 0
}
; Make sure LV legal bails out when there is no exiting block
; CHECK-LABEL: "no_exiting_block"
; CHECK: LV: Not vectorizing: The loop must have an exiting block.
define i32 @no_exiting_block() {
entry:
br label %for.body
for.body:
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ], [%inc, %for.second]
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, 16
br i1 %cmp, label %for.body, label %for.second
for.second:
br label %for.body
}
; Make sure LV legal bails out when there is a non-int, non-ptr phi
; CHECK-LABEL: "invalid_phi_types"
; CHECK: LV: Not vectorizing: Found a non-int non-pointer PHI.
define i32 @invalid_phi_types() {
entry:
br label %for.body
for.body:
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%vec.sum.02 = phi <2 x i32> [ zeroinitializer, %entry ], [ <i32 8, i32 8>, %for.body ]
%inc = add nsw i32 %i.02, 1
%cmp = icmp slt i32 %inc, 16
br i1 %cmp, label %for.body, label %for.end
for.end:
ret i32 0
}
; D40973
; Make sure LV legal bails out when the loop doesn't have a legal pre-header.
; CHECK-LABEL: "inc"
; CHECK: LV: Not vectorizing: Loop doesn't have a legal pre-header.
define void @inc(i32 %n, i8* %P) {
%1 = icmp sgt i32 %n, 0
br i1 %1, label %BB1, label %BB2
BB1:
indirectbr i8* %P, [label %.lr.ph]
BB2:
br label %.lr.ph
.lr.ph:
%indvars.iv = phi i32 [ %indvars.iv.next, %.lr.ph ], [ 0, %BB1 ], [ 0, %BB2 ]
%indvars.iv.next = add i32 %indvars.iv, 1
%exitcond = icmp eq i32 %indvars.iv.next, %n
br i1 %exitcond, label %._crit_edge, label %.lr.ph
._crit_edge:
ret void
}