| Issue |
162902
|
| Summary |
[LV] Crash in VPPartialReductionRecipe::computeCost
|
| Labels |
vectorizers
|
| Assignees |
|
| Reporter |
sjoerdmeijer
|
Compiling this:
```
char a, b;
char *c;
void d(bool e) {
for (;;)
for (int f; f < 2; f += e) {
a = c[f];
b += !f ?: e;
}
}
```
with `clang -O2 -mcpu=grace` results in a crash with this backtrace:
```
#4 0x0000000005837d75 llvm::VPPartialReductionRecipe::computeCost(llvm::ElementCount, llvm::VPCostContext&) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5837d75)
#5 0x0000000005841f46 llvm::VPRecipeBase::cost(llvm::ElementCount, llvm::VPCostContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5841f46)
#6 0x0000000005807b57 llvm::VPBasicBlock::cost(llvm::ElementCount, llvm::VPCostContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x5807b57)
#7 0x000000000580e888 llvm::VPRegionBlock::cost(llvm::ElementCount, llvm::VPCostContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x580e888)
#8 0x000000000580f70d llvm::VPlan::cost(llvm::ElementCount, llvm::VPCostContext&) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x580f70d)
#9 0x00000000056bdbda llvm::LoopVectorizationPlanner::cost(llvm::VPlan&, llvm::ElementCount) const (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56bdbda)
#10 0x00000000056c443a llvm::LoopVectorizationPlanner::computeBestVF() (.part.0) LoopVectorize.cpp:0:0
#11 0x00000000056c537a llvm::LoopVectorizationPlanner::computeBestVF() (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56c537a)
#12 0x00000000056ccee7 llvm::LoopVectorizePass::processLoop(llvm::Loop*) (/opt/compiler-explorer/clang-trunk/bin/clang+++0x56ccee7)
```
See also: https://godbolt.org/z/njcnr58a4
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