From 4d02906ddcd1b94c3c458ed7db39cc59f1f725e1 Mon Sep 17 00:00:00 2001
From: Jonas Paulsson <paulsson@linux.vnet.ibm.com>
Date: Thu, 2 Feb 2017 15:42:14 +0000
Subject: [PATCH] [SystemZ] Add comment for ISD::FP_TO_UINT expansion.

(Copied from the fp-conv-10.ll test to SystemZISelLowering.cpp)

Review: Ulrich Weigand
llvm-svn: 293900
---
 lib/Target/SystemZ/SystemZISelLowering.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/Target/SystemZ/SystemZISelLowering.cpp b/lib/Target/SystemZ/SystemZISelLowering.cpp
index e5477f8c9c1..afc9e60bdf2 100644
--- a/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -194,6 +194,9 @@ SystemZTargetLowering::SystemZTargetLowering(const TargetMachine &TM,
       setOperationAction(ISD::UMUL_LOHI, VT, Custom);
 
       // Only z196 and above have native support for conversions to unsigned.
+      // On z10, promoting to i64 doesn't generate an inexact condition for
+      // values that are outside the i32 range but in the i64 range, so use
+      // the default expansion.
       if (!Subtarget.hasFPExtension())
         setOperationAction(ISD::FP_TO_UINT, VT, Expand);
     }