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| author | Oren Ben Simhon <oren.ben.simhon@intel.com> | 2017-05-03 13:07:19 +0000 |
|---|---|---|
| committer | Oren Ben Simhon <oren.ben.simhon@intel.com> | 2017-05-03 13:07:19 +0000 |
| commit | dbd4bba1ece18ccfbdec969ec0d05aed2e151d53 (patch) | |
| tree | a0cf943fc7adc5b8121c8436e0ed2355fc3db848 /llvm/lib/Target/X86/X86FastISel.cpp | |
| parent | ef5798acf5ea024f69f012abfbec1cdfe2e44cd0 (diff) | |
| download | bcm5719-llvm-dbd4bba1ece18ccfbdec969ec0d05aed2e151d53.tar.gz bcm5719-llvm-dbd4bba1ece18ccfbdec969ec0d05aed2e151d53.zip | |
[X86] Support of no_caller_saved_registers attribute
This patch implements the LLVM part for no_caller_saved_registers attribute as appears here: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=5ed3cc7b66af4758f7849ed6f65f4365be8223be.
In order to implement the attribute, we use the dynamic CSR mechanism to remove returned/passed arguments from the function regmask/CSR list.
Differential Revision: https://reviews.llvm.org/D31876
llvm-svn: 302020
Diffstat (limited to 'llvm/lib/Target/X86/X86FastISel.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86FastISel.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86FastISel.cpp b/llvm/lib/Target/X86/X86FastISel.cpp index fd11b671dd9..ebd179e786d 100644 --- a/llvm/lib/Target/X86/X86FastISel.cpp +++ b/llvm/lib/Target/X86/X86FastISel.cpp @@ -3181,6 +3181,15 @@ bool X86FastISel::fastLowerCall(CallLoweringInfo &CLI) { bool Is64Bit = Subtarget->is64Bit(); bool IsWin64 = Subtarget->isCallingConvWin64(CC); + const CallInst *CI = + CLI.CS ? dyn_cast<CallInst>(CLI.CS->getInstruction()) : nullptr; + const Function *CalledFn = CI ? CI->getCalledFunction() : nullptr; + + // Functions with no_caller_saved_registers that need special handling. + if ((CI && CI->hasFnAttr("no_caller_saved_registers")) || + (CalledFn && CalledFn->hasFnAttribute("no_caller_saved_registers"))) + return false; + // Handle only C, fastcc, and webkit_js calling conventions for now. switch (CC) { default: return false; |
