commit 082dfec95519d26a94681aa821bebb1da18d096d
author Gordana Cmiljanovic <gordana.cmiljanovic@mips.com> Fri Oct 19 11:36:15 2018 +0200
committer Milko Leporis <milko.leporis@mips.com> Mon Oct 22 13:38:23 2018 +0000
tree 1a8a9bb6c823e1ebb20666901cabe1dbbbb8944e
parent 17dfe1b679af1d3e39f45e1aeda86cb5a8401b4d

Add support for 32b MIPS architecture

* LLVM reactor backend: requires LLVM 7.0
* Subzero reactor backend: unittests hit unimplemented
  TargetMIPS32::lowerShuffleVector()

Bug: b/117854176
Change-Id: Ie58e3e438db6f1b442b05efecf9b645aff82321a
Reviewed-on: https://swiftshader-review.googlesource.com/c/21748
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Tested-by: Milko Leporis <milko.leporis@mips.com>

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index b36d9f9..672e51e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -96,16 +96,30 @@
         "-march=pentium4",
         "-mtune=generic",
       ]
+    } else if (target_cpu == "mipsel" && current_cpu == target_cpu) {
+      cflags += [
+        "-march=mipsel",
+        "-mcpu=mips32r2",
+        "-fPIC",
+        "-mhard-float",
+        "-mfp32",
+      ]
     }
 
     if (is_linux) {
-      ldflags = [
-        "-Wl,--hash-style=both",
-        "-Wl,--gc-sections",
-      ]
+      ldflags = [ "-Wl,--gc-sections" ]
+
+      if (target_cpu == "mipsel") {
+        ldflags += [
+          "-Wl,--hash-style=sysv",
+          "-mips32r2",
+        ]
+      } else {
+        ldflags += [ "-Wl,--hash-style=both" ]
+      }
 
       # A bug in the gold linker prevents using ICF on 32-bit (crbug.com/729532)
-      if (use_gold && target_cpu == "x86") {
+      if (use_gold && (target_cpu == "x86" || target_cpu == "mipsel")) {
         ldflags += [ "-Wl,--icf=none" ]
       }
     }