[PATCH] D56925: Do not use frame pointer by default for MSP430

[Dmitry Mikushin via Phabricator via cfe-commits]

dmikushin updated this revision to Diff 182998.
dmikushin added a comment.

@grimar Please find the updated patch with a test case.


Repository:
  rC Clang

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D56925/new/

https://reviews.llvm.org/D56925

Files:
  lib/Driver/ToolChains/Clang.cpp
  test/CodeGen/msp430-fp-elim.c


Index: test/CodeGen/msp430-fp-elim.c
===================================================================
--- /dev/null
+++ test/CodeGen/msp430-fp-elim.c
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -mdisable-fp-elim -triple msp430 -S %s -o - | FileCheck %s --check-prefix=FP_ENFORCED
+// RUN: %clang_cc1 -triple msp430 -S %s -o - | FileCheck %s --check-prefix=FP_DEFAULT
+
+// Check the frame pointer is not used on MSP430 by default, but can be forcibly turned on.
+
+// FP_ENFORCED: push r4
+// FP_ENFORCED: calla r4
+// FP_ENFORCED: pop r4
+// FP_DEFAULT: .globl fp_elim_check
+// FP_DEFAULT-NOT: push r4
+// FP_DEFAULT: calla r4
+// FP_DEFAULT-NOT: pop r4
+
+void fp_elim_check()
+{
+	asm volatile ("calla r4");
+}
+
Index: lib/Driver/ToolChains/Clang.cpp
===================================================================
--- lib/Driver/ToolChains/Clang.cpp
+++ lib/Driver/ToolChains/Clang.cpp
@@ -519,10 +519,10 @@
   case llvm::Triple::xcore:
   case llvm::Triple::wasm32:
   case llvm::Triple::wasm64:
+  case llvm::Triple::msp430:
     // XCore never wants frame pointers, regardless of OS.
     // WebAssembly never wants frame pointers.
     return false;
-  case llvm::Triple::msp430:
   case llvm::Triple::riscv32:
   case llvm::Triple::riscv64:
     return !areOptimizationsEnabled(Args);


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