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DivergenceAnalysis: added debug output

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Summary:
This commit does two things:

1. modified the existing DivergenceAnalysis::dump() so it dumps the
   whole function with added DIVERGENT: annotations;

2. added code to do that dump if the appropriate -debug-only option is
   on.

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D47700

Change-Id: Id97b605aab1fc6f5a11a20c58a99bbe8c565bf83
llvm-svn: 336998
This commit is contained in:
Tim Renouf 2018-07-13 13:13:30 +00:00
parent 02eae91c4a
commit 1bd8a9908e
2 changed files with 20 additions and 6 deletions
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21
lib/Analysis/DivergenceAnalysis.cpp
View File

@ -77,6 +77,8 @@
#include <vector>
using namespace llvm;
#define DEBUG_TYPE "divergence"
namespace {
class DivergencePropagator {
@ -299,6 +301,10 @@ bool DivergenceAnalysis::runOnFunction(Function &F) {
PDT, DivergentValues);
DP.populateWithSourcesOfDivergence();
DP.propagate();
LLVM_DEBUG(
dbgs() << "\nAfter divergence analysis on " << F.getName() << ":\n";
print(dbgs(), F.getParent())
);
return false;
}
@ -318,12 +324,17 @@ void DivergenceAnalysis::print(raw_ostream &OS, const Module *) const {
// Dumps all divergent values in F, arguments and then instructions.
for (auto &Arg : F->args()) {
if (DivergentValues.count(&Arg))
OS << "DIVERGENT: " << Arg << "\n";
OS << (DivergentValues.count(&Arg) ? "DIVERGENT: " : " ");
OS << Arg << "\n";
}
// Iterate instructions using instructions() to ensure a deterministic order.
for (auto &I : instructions(F)) {
if (DivergentValues.count(&I))
OS << "DIVERGENT:" << I << "\n";
for (auto BI = F->begin(), BE = F->end(); BI != BE; ++BI) {
auto &BB = *BI;
OS << "\n " << BB.getName() << ":\n";
for (auto &I : BB.instructionsWithoutDebug()) {
OS << (DivergentValues.count(&I) ? "DIVERGENT: " : " ");
OS << I << "\n";
}
}
OS << "\n";
}

5
test/Analysis/DivergenceAnalysis/AMDGPU/phi-undef.ll
View File

@ -2,9 +2,12 @@
; CHECK-LABEL: 'test1':
; CHECK-NEXT: DIVERGENT: i32 %bound
; CHECK: {{^ *}}%counter =
; CHECK-NEXT: DIVERGENT: %break = icmp sge i32 %counter, %bound
; CHECK-NEXT: DIVERGENT: br i1 %break, label %footer, label %body
; CHECK-NEXT: DIVERGENT: br i1 %break, label %end, label %header
; CHECK: {{^ *}}%counter.next =
; CHECK: {{^ *}}%counter.footer =
; CHECK: DIVERGENT: br i1 %break, label %end, label %header
; Note: %counter is not divergent!
define amdgpu_ps void @test1(i32 %bound) {
entry: