Author: asl Date: Tue Feb 5 12:15:03 2019 New Revision: 353212 URL: http://llvm.org/viewvc/llvm-project?rev=353212&view=rev Log: Do not use frame pointer by default for MSP430
This is suggested by 3.3.9 of MSP430 EABI document. We do allow user to manually enable frame pointer. GCC toolchain uses the same behavior. Patch by Dmitry Mikushev! Differential Revision: https://reviews.llvm.org/D56925 Added: cfe/trunk/test/CodeGen/msp430-fp-elim.c Modified: cfe/trunk/lib/Driver/ToolChains/Clang.cpp Modified: cfe/trunk/lib/Driver/ToolChains/Clang.cpp URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/ToolChains/Clang.cpp?rev=353212&r1=353211&r2=353212&view=diff ============================================================================== --- cfe/trunk/lib/Driver/ToolChains/Clang.cpp (original) +++ cfe/trunk/lib/Driver/ToolChains/Clang.cpp Tue Feb 5 12:15:03 2019 @@ -519,6 +519,7 @@ static bool useFramePointerForTargetByDe 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; Added: cfe/trunk/test/CodeGen/msp430-fp-elim.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/msp430-fp-elim.c?rev=353212&view=auto ============================================================================== --- cfe/trunk/test/CodeGen/msp430-fp-elim.c (added) +++ cfe/trunk/test/CodeGen/msp430-fp-elim.c Tue Feb 5 12:15:03 2019 @@ -0,0 +1,19 @@ +// REQUIRES: msp430-registered-target +// 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: mov r4, r4 +// FP_ENFORCED: pop r4 +// FP_DEFAULT: .globl fp_elim_check +// FP_DEFAULT-NOT: push r4 +// FP_DEFAULT: mov r4, r4 +// FP_DEFAULT-NOT: pop r4 + +void fp_elim_check() +{ + asm volatile ("mov r4, r4"); +} + _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
