[PATCH] D38204: [TargetTransformInfo] Check if function pointer is valid before calling isLoweredToCall

[Guozhi Wei via Phabricator via llvm-commits]

Carrot updated this revision to Diff 116574.

https://reviews.llvm.org/D38204

Files:
  include/llvm/Analysis/TargetTransformInfoImpl.h
  test/Analysis/CostModel/X86/costmodel.ll


Index: test/Analysis/CostModel/X86/costmodel.ll
===================================================================
--- test/Analysis/CostModel/X86/costmodel.ll
+++ test/Analysis/CostModel/X86/costmodel.ll
@@ -45,6 +45,10 @@
   ; CODESIZE: cost of 1 {{.*}} call
   %uadd = call { i32, i1 } @llvm.uadd.with.overflow.i32(i32 undef, i32 undef)
 
+  ; LATENCY:  cost of 40 {{.*}} call void undef
+  ; CODESIZE: cost of 1 {{.*}} call void undef
+  call void undef()
+
   ; LATENCY:  cost of 1 {{.*}} ret
   ; CODESIZE: cost of 1 {{.*}} ret
   ret i64 undef
Index: include/llvm/Analysis/TargetTransformInfoImpl.h
===================================================================
--- include/llvm/Analysis/TargetTransformInfoImpl.h
+++ include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -188,6 +188,8 @@
   }
 
   bool isLoweredToCall(const Function *F) {
+    assert(F && "A concrete function must be provided to this routine.");
+
     // FIXME: These should almost certainly not be handled here, and instead
     // handled with the help of TLI or the target itself. This was largely
     // ported from existing analysis heuristics here so that such refactorings
@@ -794,7 +796,7 @@
     // A real function call is much slower.
     if (auto *CI = dyn_cast<CallInst>(I)) {
       const Function *F = CI->getCalledFunction();
-      if (static_cast<T *>(this)->isLoweredToCall(F))
+      if (!F || static_cast<T *>(this)->isLoweredToCall(F))
         return 40;
       // Some intrinsics return a value and a flag, we use the value type
       // to decide its latency.


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