[PATCH] D57497: [RISCV] Passing -G value to RISCV backend

[Shiva Chen via Phabricator via cfe-commits]

shiva0217 created this revision.
shiva0217 added reviewers: asb, apazos.
Herald added subscribers: jocewei, PkmX, rkruppe, the_o, brucehoult, MartinMosbeck, rogfer01, edward-jones, zzheng, jrtc27, kito-cheng, niosHD, sabuasal, simoncook, johnrusso, rbar.

Passing -G value to RISCVELFTargetObjectFile by  -riscv-ssection-threshold flag,
So the backend can set small data section threshold by the value.


Repository:
  rC Clang

https://reviews.llvm.org/D57497

Files:
  lib/Driver/ToolChains/Clang.cpp
  test/Driver/riscv-features.c


Index: test/Driver/riscv-features.c
===================================================================
--- test/Driver/riscv-features.c
+++ test/Driver/riscv-features.c
@@ -11,3 +11,9 @@
 // NO-RELAX: "-target-feature" "-relax"
 // DEFAULT-NOT: "-target-feature" "+relax"
 // DEFAULT-NOT: "-target-feature" "-relax"
+
+/// -G
+// RUN: %clang -target riscv32 -### -S %s \
+// RUN:     -G 16 2>&1 \
+// RUN:   | FileCheck --check-prefix=CHECK-RISCV-G %s
+// CHECK-RISCV-G: "-mllvm" "-riscv-ssection-threshold=16"
Index: lib/Driver/ToolChains/Clang.cpp
===================================================================
--- lib/Driver/ToolChains/Clang.cpp
+++ lib/Driver/ToolChains/Clang.cpp
@@ -1799,6 +1799,14 @@
 
   CmdArgs.push_back("-target-abi");
   CmdArgs.push_back(ABIName);
+
+  // Passing small data section limitaion if has -G flag.
+  if (Arg *A = Args.getLastArg(options::OPT_G)) {
+    StringRef v = A->getValue();
+    CmdArgs.push_back("-mllvm");
+    CmdArgs.push_back(Args.MakeArgString("-riscv-ssection-threshold=" + v));
+    A->claim();
+  }
 }
 
 void Clang::AddSparcTargetArgs(const ArgList &Args,


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