[TargetPassConfig] Add a hook to tell whether GlobalISel should warm on fallback.

Thanks to this patch, we know have a way to easly see if GlobalISel
failed.

llvm-svn: 280273

1 files changed, 10 insertions, 4 deletions

diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
index 88b94f51928..1244681592b 100644
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -98,11 +98,13 @@ PrintMachineInstrs("print-machineinstrs", cl::ValueOptional,
                    cl::desc("Print machine instrs"),
                    cl::value_desc("pass-name"), cl::init("option-unspecified"));
 
-static cl::opt<bool> EnableGlobalISelAbort(
+static cl::opt<int> EnableGlobalISelAbort(
     "global-isel-abort", cl::Hidden,
     cl::desc("Enable abort calls when \"global\" instruction selection "
-             "fails to lower/select an instruction"),
-    cl::init(true));
+             "fails to lower/select an instruction: 0 disable the abort, "
+             "1 enable the abort, and "
+             "2 disable the abort but emit a diagnostic on failure"),
+    cl::init(1));
 
 // Temporary option to allow experimenting with MachineScheduler as a post-RA
 // scheduler. Targets can "properly" enable this with
@@ -899,5 +901,9 @@ void TargetPassConfig::addBlockPlacement() {
 /// GlobalISel Configuration
 //===---------------------------------------------------------------------===//
 bool TargetPassConfig::isGlobalISelAbortEnabled() const {
-  return EnableGlobalISelAbort;
+  return EnableGlobalISelAbort == 1;
+}
+
+bool TargetPassConfig::reportDiagnosticWhenGlobalISelFallback() const {
+  return EnableGlobalISelAbort == 2;
 }