6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-14 00:32:55 +00:00
Code Issues Projects Releases Wiki Activity

jump threading can't split a critical edge from an indirectbr. This

Browse Source 
fixes PR7356.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105950 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-06-14 19:45:43 +00:00
parent 12b8bc1b01
commit e58867e55e
2 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
lib/Transforms/Scalar/JumpThreading.cpp
View File

@ -870,9 +870,14 @@ bool JumpThreading::SimplifyPartiallyRedundantLoad(LoadInst *LI) {
// Add all the unavailable predecessors to the PredsToSplit list. // Add all the unavailable predecessors to the PredsToSplit list.
for (pred_iterator PI = pred_begin(LoadBB), PE = pred_end(LoadBB); for (pred_iterator PI = pred_begin(LoadBB), PE = pred_end(LoadBB);
PI != PE; ++PI) PI != PE; ++PI) {
// If the predecessor is an indirect goto, we can't split the edge.
if (isa<IndirectBrInst>((*PI)->getTerminator()))
return false;
if (!AvailablePredSet.count(*PI)) if (!AvailablePredSet.count(*PI))
PredsToSplit.push_back(*PI); PredsToSplit.push_back(*PI);
}
// Split them out to their own block. // Split them out to their own block.
UnavailablePred = UnavailablePred =

22
test/Transforms/JumpThreading/crash.ll
View File

@ -341,3 +341,25 @@ if.end12: ; preds = %if.then, %lbl_51
ret void ret void
} }
; PR7356
define i32 @test13(i32* %P, i8* %Ptr) {
entry:
indirectbr i8* %Ptr, [label %BrBlock, label %B2]
B2:
store i32 4, i32 *%P
br label %BrBlock
BrBlock:
%L = load i32* %P
%C = icmp eq i32 %L, 42
br i1 %C, label %T, label %F
T:
ret i32 123
F:
ret i32 1422
}