mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-13 14:35:54 +00:00
[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
This commit is contained in:
parent
703ab7307a
commit
ade451beaf
@ -1385,6 +1385,7 @@ private:
|
||||
// Thus, one path from the guard goes to the preheader for FC0 (and thus
|
||||
// executes the new fused loop) and the other path goes to the NonLoopBlock
|
||||
// for FC1 (where FC1 guard would have gone if FC1 was not executed).
|
||||
FC1NonLoopBlock->replacePhiUsesWith(FC1GuardBlock, FC0GuardBlock);
|
||||
FC0.GuardBranch->replaceUsesOfWith(FC0NonLoopBlock, FC1NonLoopBlock);
|
||||
FC0.ExitBlock->getTerminator()->replaceUsesOfWith(FC1GuardBlock,
|
||||
FC1.Header);
|
||||
|
@ -232,3 +232,62 @@ for.second.exit:
|
||||
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
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user