Set min LLVM version to 9 and make version checking use a non-inclusive upper

bound.

We use a non-inclusive upper bound so that setting the upper bound to 13 for
example means that all 12.x versions are accepted.

compiler/GHC/CmmToLlvm.hs

@@ -64,8 +64,8 @@ llvmCodeGen logger dflags h cmm_stream
          let doWarn = wopt Opt_WarnUnsupportedLlvmVersion dflags
          when (not (llvmVersionSupported ver) && doWarn) $ putMsg logger $
            "You are using an unsupported version of LLVM!" $$
-           "Currently only" <+> text (llvmVersionStr supportedLlvmVersionMin) <+>
-           "to" <+> text (llvmVersionStr supportedLlvmVersionMax) <+> "is supported." <+>
+           "Currently only" <+> text (llvmVersionStr supportedLlvmVersionLowerBound) <+>
+           "to" <+> text (llvmVersionStr supportedLlvmVersionUpperBound) <+> "is supported." <+>
            "System LLVM version: " <> text (llvmVersionStr ver) $$
            "We will try though..."
          let isS390X = platformArch (targetPlatform dflags) == ArchS390X
@@ -78,7 +78,7 @@ llvmCodeGen logger dflags h cmm_stream
        -- currently don't use the LLVM version to guide code generation
        -- so this is okay.
        let llvm_ver :: LlvmVersion
-           llvm_ver = fromMaybe supportedLlvmVersionMin mb_ver
+           llvm_ver = fromMaybe supportedLlvmVersionLowerBound mb_ver
 
        -- run code generation
        a <- runLlvm logger dflags llvm_ver bufh $

compiler/GHC/CmmToLlvm/Base.hs

@@ -15,7 +15,7 @@ module GHC.CmmToLlvm.Base (
         LiveGlobalRegs,
         LlvmUnresData, LlvmData, UnresLabel, UnresStatic,
 
-        LlvmVersion, supportedLlvmVersionMin, supportedLlvmVersionMax,
+        LlvmVersion, supportedLlvmVersionLowerBound, supportedLlvmVersionUpperBound,
         llvmVersionSupported, parseLlvmVersion,
         llvmVersionStr, llvmVersionList,
 
@@ -263,7 +263,6 @@ llvmPtrBits platform = widthInBits $ typeWidth $ gcWord platform
 -- * Llvm Version
 --
 
--- Newtype to avoid using the Eq instance!
 newtype LlvmVersion = LlvmVersion { llvmVersionNE :: NE.NonEmpty Int }
   deriving (Eq, Ord)
 
@@ -281,14 +280,17 @@ parseLlvmVersion =
       where
         (ver_str, rest) = span isDigit s
 
--- | The LLVM Version that is currently supported.
-supportedLlvmVersionMin, supportedLlvmVersionMax :: LlvmVersion
-supportedLlvmVersionMin = LlvmVersion (sUPPORTED_LLVM_VERSION_MIN NE.:| [])
-supportedLlvmVersionMax = LlvmVersion (sUPPORTED_LLVM_VERSION_MAX NE.:| [])
+-- | The (inclusive) lower bound on the LLVM Version that is currently supported.
+supportedLlvmVersionLowerBound :: LlvmVersion
+supportedLlvmVersionLowerBound = LlvmVersion (sUPPORTED_LLVM_VERSION_MIN NE.:| [])
+
+-- | The (not-inclusive) upper bound  bound on the LLVM Version that is currently supported.
+supportedLlvmVersionUpperBound :: LlvmVersion
+supportedLlvmVersionUpperBound = LlvmVersion (sUPPORTED_LLVM_VERSION_MAX NE.:| [])
 
 llvmVersionSupported :: LlvmVersion -> Bool
 llvmVersionSupported v =
-  v > supportedLlvmVersionMin && v <= supportedLlvmVersionMax
+  v >= supportedLlvmVersionLowerBound && v < supportedLlvmVersionUpperBound
 
 llvmVersionStr :: LlvmVersion -> String
 llvmVersionStr = intercalate "." . map show . llvmVersionList

compiler/GHC/SysTools/Tasks.hs

@@ -14,7 +14,7 @@ import GHC.Platform
 import GHC.ForeignSrcLang
 import GHC.IO (catchException)
 
-import GHC.CmmToLlvm.Base (LlvmVersion, llvmVersionStr, supportedLlvmVersionMin, supportedLlvmVersionMax, llvmVersionStr, parseLlvmVersion)
+import GHC.CmmToLlvm.Base (LlvmVersion, llvmVersionStr, supportedLlvmVersionLowerBound, supportedLlvmVersionUpperBound, llvmVersionStr, parseLlvmVersion)
 
 import GHC.SysTools.Process
 import GHC.SysTools.Info
@@ -236,10 +236,11 @@ figureLlvmVersion logger dflags = traceToolCommand logger "llc" $ do
                 errorMsg logger $ vcat
                     [ text "Warning:", nest 9 $
                           text "Couldn't figure out LLVM version!" $$
-                          text ("Make sure you have installed LLVM between "
-                                ++ llvmVersionStr supportedLlvmVersionMin
+                          text ("Make sure you have installed LLVM between ["
+                                ++ llvmVersionStr supportedLlvmVersionLowerBound
                                 ++ " and "
-                                ++ llvmVersionStr supportedLlvmVersionMax) ]
+                                ++ llvmVersionStr supportedLlvmVersionUpperBound
+                                ++ ")") ]
                 return Nothing)
 
 

configure.ac

@@ -724,8 +724,8 @@ AC_SUBST(InstallNameToolCmd)
 # tools we are looking for. In the past, GHC supported a number of
 # versions of LLVM simultaneously, but that stopped working around
 # 3.5/3.6 release of LLVM.
-LlvmMinVersion=10
-LlvmMaxVersion=12 # inclusive
+LlvmMinVersion=9  # inclusive
+LlvmMaxVersion=13 # not inclusive
 AC_SUBST([LlvmMinVersion])
 AC_SUBST([LlvmMaxVersion])
 sUPPORTED_LLVM_VERSION_MIN=$(echo \($LlvmMinVersion\) | sed 's/\./,/')

m4/find_llvm_prog.m4

@@ -24,7 +24,7 @@ AC_DEFUN([FIND_LLVM_PROG],[
             [AC_MSG_RESULT(no)
              $1=""
              AC_MSG_NOTICE([We only support llvm $3 to $4 (found $PROG_VERSION).])],
-            [AX_COMPARE_VERSION([$PROG_VERSION], [gt], [$4],
+            [AX_COMPARE_VERSION([$PROG_VERSION], [ge], [$4],
              [AC_MSG_RESULT(no)
               $1=""
               AC_MSG_NOTICE([We only support llvm $3 to $4 (found $PROG_VERSION).])],