[CodeGen] allow printing of zero latency in sched comments

I don't know how to expose this in a test. There are ARM / AArch64
sched classes that include zero latency instructions, but I'm not
seeing sched info printed for those targets. X86 will almost
certainly have these soon (see PR36671), but no model has
'let Latency = 0' currently.

llvm-svn: 327518

diff --git a/llvm/lib/CodeGen/TargetSubtargetInfo.cpp b/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
index a72d7eb..0d7940d 100644 (file)
--- a/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
+++ b/llvm/lib/CodeGen/TargetSubtargetInfo.cpp
@@ -68,17 +68,15 @@ bool TargetSubtargetInfo::useAA() const {
 }
 
 static std::string createSchedInfoStr(unsigned Latency,
-                                     Optional<double> RThroughput) {
+                                      Optional<double> RThroughput) {
   static const char *SchedPrefix = " sched: [";
   std::string Comment;
   raw_string_ostream CS(Comment);
-  if (Latency > 0 && RThroughput.hasValue())
+  if (RThroughput.hasValue())
     CS << SchedPrefix << Latency << format(":%2.2f", RThroughput.getValue())
        << "]";
-  else if (Latency > 0)
+  else
     CS << SchedPrefix << Latency << ":?]";
-  else if (RThroughput.hasValue())
-    CS << SchedPrefix << "?:" << RThroughput.getValue() << "]";
   CS.flush();
   return Comment;
 }