1 files changed, 3 insertions, 7 deletions

diff --git a/llvm/lib/Support/APFloat.cpp b/llvm/lib/Support/APFloat.cpp
index a7b9f25..e99649d 100644
--- a/llvm/lib/Support/APFloat.cpp
+++ b/llvm/lib/Support/APFloat.cpp
@@ -3262,9 +3262,8 @@ bool IEEEFloat::convertFromStringSpecials(StringRef str) {
     return true;
   }
 
-  bool IsNegative = str.front() == '-';
+  bool IsNegative = str.consume_front("-");
   if (IsNegative) {
-    str = str.drop_front();
     if (str.size() < MIN_NAME_SIZE)
       return false;
 
@@ -3275,16 +3274,13 @@ bool IEEEFloat::convertFromStringSpecials(StringRef str) {
   }
 
   // If we have a 's' (or 'S') prefix, then this is a Signaling NaN.
-  bool IsSignaling = str.front() == 's' || str.front() == 'S';
+  bool IsSignaling = str.consume_front_insensitive("s");
   if (IsSignaling) {
-    str = str.drop_front();
     if (str.size() < MIN_NAME_SIZE)
       return false;
   }
 
-  if (str.starts_with("nan") || str.starts_with("NaN")) {
-    str = str.drop_front(3);
-
+  if (str.consume_front("nan") || str.consume_front("NaN")) {
     // A NaN without payload.
     if (str.empty()) {
       makeNaN(IsSignaling, IsNegative);