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llvm-mirror/test/Transforms/LoopFusion/guarded.ll
Whitney Tsang ade451beaf [LoopFusion] Update second loop guard non loop successor phis incoming
blocks.

Summary: The current LoopFusion forget to update the incoming block of
the phis in second loop guard non loop successor from second loop guard
block to first loop guard block. A test case is provided to better
understand the problem.
Reviewed By: jdoerfert
Subscribers: hiraditya, llvm-commits
Tag: LLVM
Differential Revision: https://reviews.llvm.org/D81421
2020-06-09 21:14:51 +00:00

294 lines
8.9 KiB
LLVM

; RUN: opt -S -loop-fusion < %s | FileCheck %s
@B = common global [1024 x i32] zeroinitializer, align 16
; CHECK: void @dep_free_parametric
; CHECK-next: entry:
; CHECK: br i1 %{{.*}}, label %[[LOOP1PREHEADER:bb[0-9]*]], label %[[LOOP1SUCC:bb[0-9]+]]
; CHECK: [[LOOP1PREHEADER]]
; CHECK-NEXT: br label %[[LOOP1BODY:bb[0-9]*]]
; CHECK: [[LOOP1BODY]]
; CHECK: br i1 %{{.*}}, label %[[LOOP1BODY]], label %[[LOOP2EXIT:bb[0-9]+]]
; CHECK: [[LOOP2EXIT]]
; CHECK: br label %[[LOOP1SUCC]]
; CHECK: [[LOOP1SUCC]]
; CHECK: ret void
define void @dep_free_parametric(i32* noalias %A, i64 %N) {
entry:
%cmp4 = icmp slt i64 0, %N
br i1 %cmp4, label %bb3, label %bb14
bb3: ; preds = %entry
br label %bb5
bb5: ; preds = %bb3, %bb5
%i.05 = phi i64 [ %inc, %bb5 ], [ 0, %bb3 ]
%sub = sub nsw i64 %i.05, 3
%add = add nsw i64 %i.05, 3
%mul = mul nsw i64 %sub, %add
%rem = srem i64 %mul, %i.05
%conv = trunc i64 %rem to i32
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %i.05
store i32 %conv, i32* %arrayidx, align 4
%inc = add nsw i64 %i.05, 1
%cmp = icmp slt i64 %inc, %N
br i1 %cmp, label %bb5, label %bb10
bb10: ; preds = %bb5
br label %bb14
bb14: ; preds = %bb10, %entry
%cmp31 = icmp slt i64 0, %N
br i1 %cmp31, label %bb8, label %bb12
bb8: ; preds = %bb14
br label %bb9
bb9: ; preds = %bb8, %bb9
%i1.02 = phi i64 [ %inc14, %bb9 ], [ 0, %bb8 ]
%sub7 = sub nsw i64 %i1.02, 3
%add8 = add nsw i64 %i1.02, 3
%mul9 = mul nsw i64 %sub7, %add8
%rem10 = srem i64 %mul9, %i1.02
%conv11 = trunc i64 %rem10 to i32
%arrayidx12 = getelementptr inbounds [1024 x i32], [1024 x i32]* @B, i64 0, i64 %i1.02
store i32 %conv11, i32* %arrayidx12, align 4
%inc14 = add nsw i64 %i1.02, 1
%cmp3 = icmp slt i64 %inc14, %N
br i1 %cmp3, label %bb9, label %bb15
bb15: ; preds = %bb9
br label %bb12
bb12: ; preds = %bb15, %bb14
ret void
}
; Test that `%add` is moved in for.first.preheader, and the two loops for.first
; and for.second are fused.
; CHECK: void @moveinsts_preheader
; CHECK-LABEL: for.first.guard:
; CHECK: br i1 %cmp.guard, label %for.first.preheader, label %for.end
; CHECK-LABEL: for.first.preheader:
; CHECK-NEXT: %add = add nsw i32 %x, 1
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: br i1 %cmp.j, label %for.first, label %for.second.exit
; CHECK-LABEL: for.second.exit:
; CHECK-NEXT: br label %for.end
; CHECK-LABEL: for.end:
; CHECK-NEXT: ret void
define void @moveinsts_preheader(i32* noalias %A, i32* noalias %B, i64 %N, i32 %x) {
for.first.guard:
%cmp.guard = icmp slt i64 0, %N
br i1 %cmp.guard, label %for.first.preheader, label %for.second.guard
for.first.preheader:
br label %for.first
for.first:
%i = phi i64 [ %inc.i, %for.first ], [ 0, %for.first.preheader ]
%Ai = getelementptr inbounds i32, i32* %A, i64 %i
store i32 0, i32* %Ai, align 4
%inc.i = add nsw i64 %i, 1
%cmp.i = icmp slt i64 %inc.i, %N
br i1 %cmp.i, label %for.first, label %for.first.exit
for.first.exit:
br label %for.second.guard
for.second.guard:
br i1 %cmp.guard, label %for.second.preheader, label %for.end
for.second.preheader:
%add = add nsw i32 %x, 1
br label %for.second
for.second:
%j = phi i64 [ %inc.j, %for.second ], [ 0, %for.second.preheader ]
%Bj = getelementptr inbounds i32, i32* %B, i64 %j
store i32 0, i32* %Bj, align 4
%inc.j = add nsw i64 %j, 1
%cmp.j = icmp slt i64 %inc.j, %N
br i1 %cmp.j, label %for.second, label %for.second.exit
for.second.exit:
br label %for.end
for.end:
ret void
}
; Test that `%add` is moved in for.second.exit, and the two loops for.first
; and for.second are fused.
; CHECK: void @moveinsts_exitblock
; CHECK-LABEL: for.first.guard:
; CHECK: br i1 %cmp.guard, label %for.first.preheader, label %for.end
; CHECK-LABEL: for.first.preheader:
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: br i1 %cmp.j, label %for.first, label %for.second.exit
; CHECK-LABEL: for.second.exit:
; CHECK-NEXT: %add = add nsw i32 %x, 1
; CHECK-NEXT: br label %for.end
; CHECK-LABEL: for.end:
; CHECK-NEXT: ret void
define void @moveinsts_exitblock(i32* noalias %A, i32* noalias %B, i64 %N, i32 %x) {
for.first.guard:
%cmp.guard = icmp slt i64 0, %N
br i1 %cmp.guard, label %for.first.preheader, label %for.second.guard
for.first.preheader:
br label %for.first
for.first:
%i.04 = phi i64 [ %inc, %for.first ], [ 0, %for.first.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %i.04
store i32 0, i32* %arrayidx, align 4
%inc = add nsw i64 %i.04, 1
%cmp = icmp slt i64 %inc, %N
br i1 %cmp, label %for.first, label %for.first.exit
for.first.exit:
%add = add nsw i32 %x, 1
br label %for.second.guard
for.second.guard:
br i1 %cmp.guard, label %for.second.preheader, label %for.end
for.second.preheader:
br label %for.second
for.second:
%j.02 = phi i64 [ %inc6, %for.second ], [ 0, %for.second.preheader ]
%arrayidx4 = getelementptr inbounds i32, i32* %B, i64 %j.02
store i32 0, i32* %arrayidx4, align 4
%inc6 = add nsw i64 %j.02, 1
%cmp.j = icmp slt i64 %inc6, %N
br i1 %cmp.j, label %for.second, label %for.second.exit
for.second.exit:
br label %for.end
for.end:
ret void
}
; Test that `%add` is moved in for.first.guard, and the two loops for.first
; and for.second are fused.
; CHECK: void @moveinsts_guardblock
; CHECK-LABEL: for.first.guard:
; CHECK-NEXT: %cmp.guard = icmp slt i64 0, %N
; CHECK-NEXT: %add = add nsw i32 %x, 1
; CHECK: br i1 %cmp.guard, label %for.first.preheader, label %for.end
; CHECK-LABEL: for.first.preheader:
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: br i1 %cmp.j, label %for.first, label %for.second.exit
; CHECK-LABEL: for.second.exit:
; CHECK-NEXT: br label %for.end
; CHECK-LABEL: for.end:
; CHECK-NEXT: ret void
define void @moveinsts_guardblock(i32* noalias %A, i32* noalias %B, i64 %N, i32 %x) {
for.first.guard:
%cmp.guard = icmp slt i64 0, %N
br i1 %cmp.guard, label %for.first.preheader, label %for.second.guard
for.first.preheader:
br label %for.first
for.first:
%i.04 = phi i64 [ %inc, %for.first ], [ 0, %for.first.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %i.04
store i32 0, i32* %arrayidx, align 4
%inc = add nsw i64 %i.04, 1
%cmp = icmp slt i64 %inc, %N
br i1 %cmp, label %for.first, label %for.first.exit
for.first.exit:
br label %for.second.guard
for.second.guard:
%add = add nsw i32 %x, 1
br i1 %cmp.guard, label %for.second.preheader, label %for.end
for.second.preheader:
br label %for.second
for.second:
%j.02 = phi i64 [ %inc6, %for.second ], [ 0, %for.second.preheader ]
%arrayidx4 = getelementptr inbounds i32, i32* %B, i64 %j.02
store i32 0, i32* %arrayidx4, align 4
%inc6 = add nsw i64 %j.02, 1
%cmp.j = icmp slt i64 %inc6, %N
br i1 %cmp.j, label %for.second, label %for.second.exit
for.second.exit:
br label %for.end
for.end:
ret void
}
; Test that the incoming block of `%j.lcssa` is updated correctly
; from for.second.guard to for.first.guard, and the two loops for.first and
; for.second are fused.
; CHECK: i64 @updatephi_guardnonloopblock
; CHECK-LABEL: for.first.guard:
; CHECK-NEXT: %cmp.guard = icmp slt i64 0, %N
; CHECK: br i1 %cmp.guard, label %for.first.preheader, label %for.end
; CHECK-LABEL: for.first.preheader:
; CHECK-NEXT: br label %for.first
; CHECK-LABEL: for.first:
; CHECK: br i1 %cmp.j, label %for.first, label %for.second.exit
; CHECK-LABEL: for.second.exit:
; CHECK-NEXT: br label %for.end
; CHECK-LABEL: for.end:
; CHECK-NEXT: %j.lcssa = phi i64 [ 0, %for.first.guard ], [ %j.02, %for.second.exit ]
; CHECK-NEXT: ret i64 %j.lcssa
define i64 @updatephi_guardnonloopblock(i32* noalias %A, i32* noalias %B, i64 %N, i32 %x) {
for.first.guard:
%cmp.guard = icmp slt i64 0, %N
br i1 %cmp.guard, label %for.first.preheader, label %for.second.guard
for.first.preheader:
br label %for.first
for.first:
%i.04 = phi i64 [ %inc, %for.first ], [ 0, %for.first.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %A, i64 %i.04
store i32 0, i32* %arrayidx, align 4
%inc = add nsw i64 %i.04, 1
%cmp = icmp slt i64 %inc, %N
br i1 %cmp, label %for.first, label %for.first.exit
for.first.exit:
br label %for.second.guard
for.second.guard:
br i1 %cmp.guard, label %for.second.preheader, label %for.end
for.second.preheader:
br label %for.second
for.second:
%j.02 = phi i64 [ %inc6, %for.second ], [ 0, %for.second.preheader ]
%arrayidx4 = getelementptr inbounds i32, i32* %B, i64 %j.02
store i32 0, i32* %arrayidx4, align 4
%inc6 = add nsw i64 %j.02, 1
%cmp.j = icmp slt i64 %inc6, %N
br i1 %cmp.j, label %for.second, label %for.second.exit
for.second.exit:
br label %for.end
for.end:
%j.lcssa = phi i64 [ 0, %for.second.guard ], [ %j.02, %for.second.exit ]
ret i64 %j.lcssa
}