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Sameer AbuAsal 70926d1510 [RISCV] Tail calls don't need to save return address 
Summary:
 When expanding the PseudoTail in expandFunctionCall() we were using X6
 to save the return address. Since this is a tail call the return
 address is not needed, this patch replaces it with X0 to be ignored.

 This matches the behaviour listed in the ISA V2.2 document page 110.
 tail offset -----> jalr x0, x6, offset

 GCC exhibits the same behavior.

Reviewers: apazos, asb, mgrang

Reviewed By: asb

Subscribers: rbar, johnrusso, simoncook, niosHD, kito-cheng, shiva0217, zzheng, edward-jones, rogfer01

Differential Revision: https://reviews.llvm.org/D48343

llvm-svn: 335239
2018-06-21 14:37:09 +00:00
bindings [LLVM-C] [OCaml] Remove LLVMAddBBVectorizePass 2018-05-28 16:58:10 +00:00
cmake [cmake] Change ON/OFF to YES/NO. NFC 2018-06-14 23:40:04 +00:00
docs TableGen/SearchableTables: Support more generic enums and tables 2018-06-21 13:36:22 +00:00
examples [ORC] Update JITCompileCallbackManager to support multi-threaded code. 2018-05-30 01:57:45 +00:00
include AMDGPU: Remove old-style image intrinsics 2018-06-21 13:37:45 +00:00
lib [RISCV] Tail calls don't need to save return address 2018-06-21 14:37:09 +00:00
projects
resources
runtimes [CMake] Pass additional CMake tools to external projects 2018-06-06 21:43:37 +00:00
test [RISCV] Tail calls don't need to save return address 2018-06-21 14:37:09 +00:00
tools [llvm-exegesis][NFC] Simplify LLVMState. 2018-06-21 14:11:09 +00:00
unittests [llvm-exegesis] Add mechanism to add target-specific passes. 2018-06-20 11:54:35 +00:00
utils TableGen/SearchableTables: Support more generic enums and tables 2018-06-21 13:36:22 +00:00
.arcconfig
.clang-format
.clang-tidy
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore
CMakeLists.txt [CMake] Handle 'libtool' being at a path with spaces in it. 2018-06-13 18:21:47 +00:00
CODE_OWNERS.TXT CODE_OWNERS: Take ownership of the MIPS backend 2018-06-21 09:59:44 +00:00
configure
CREDITS.TXT Update my information in the CREDITS file. 2018-06-15 20:02:11 +00:00
LICENSE.TXT Update copyright year to 2018. 2018-06-18 12:22:17 +00:00
llvm.spec.in
LLVMBuild.txt
README.txt Test commit: remove a blank line 2018-06-08 21:21:55 +00:00
RELEASE_TESTERS.TXT Remove myself from the release testers list. (NFC) 2018-06-20 21:25:50 +00:00

README.txt 

The LLVM Compiler Infrastructure
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Please see the documentation provided in docs/ for further
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