[llvm-reduce] Add flag to start at finer granularity

Sometimes if llvm-reduce is interrupted in the middle of a delta pass on
a large file, it can take quite some time for the tool to start actually
doing new work if it is restarted again on the partially-reduced file. A
lot of time ends up being spent testing large chunks when these large
chunks are very unlikely to actually pass the interestingness test. In
cases like this, the tool will complete faster if the starting
granularity is reduced to a finer amount. Thus, we introduce a command
line flag that automatically divides the chunks into smaller subsets a
fixed, user-specified number of times prior to beginning the core loop.

Reviewed By: aeubanks

Differential Revision: https://reviews.llvm.org/D112651

Author: Dwight Guth

llvm/test/tools/llvm-reduce/granularity-level.ll

@@ -0,0 +1,30 @@
+; Test that llvm-reduce produces the same output when starting at a higher granularity level.
+;
+; RUN: llvm-reduce --delta-passes=functions,instructions --starting-granularity-level=2 --test FileCheck --test-arg --check-prefixes=CHECK-ALL,CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t
+; RUN: cat %t | FileCheck -implicit-check-not=uninteresting --check-prefixes=CHECK-ALL,CHECK-FINAL %s
+
+define i32 @uninteresting1() {
+entry:
+  ret i32 0
+}
+
+; CHECK-ALL-LABEL: interesting()
+define i32 @interesting() {
+entry:
+  ; CHECK-INTERESTINGNESS: call i32 @interesting()
+  %call2 = call i32 @interesting()
+  %call = call i32 @uninteresting1()
+  ret i32 5
+}
+
+; CHECK-FINAL-NEXT: entry:
+; CHECK-FINAL-NEXT:   %call2 = call i32 @interesting()
+; CHECK-FINAL-NEXT:   ret i32 5
+; CHECK-FINAL-NEXT: }
+
+define i32 @uninteresting2() {
+entry:
+  ret i32 0
+}
+
+declare void @uninteresting3()

llvm/tools/llvm-reduce/deltas/Delta.cpp

@@ -27,6 +27,10 @@ static cl::opt<bool> AbortOnInvalidReduction(
     "abort-on-invalid-reduction",
     cl::desc("Abort if any reduction results in invalid IR"));
 
+static cl::opt<unsigned int> StartingGranularityLevel(
+    "starting-granularity-level",
+    cl::desc("Number of times to divide chunks prior to first test"));
+
 void writeOutput(ReducerWorkItem &M, llvm::StringRef Message);
 
 bool isReduced(ReducerWorkItem &M, TestRunner &Test,
@@ -118,6 +122,10 @@ void runDeltaPassInt(
   std::vector<Chunk> ChunksStillConsideredInteresting = {{1, Targets}};
   std::unique_ptr<ReducerWorkItem> ReducedProgram;
 
+  for (unsigned int Level = 0; Level < StartingGranularityLevel; Level++) {
+    increaseGranularity(ChunksStillConsideredInteresting);
+  }
+
   bool FoundAtLeastOneNewUninterestingChunkWithCurrentGranularity;
   do {
     FoundAtLeastOneNewUninterestingChunkWithCurrentGranularity = false;