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Author SHA1 Message Date
Sam Elliott 28145735f7 [RISCV] Avoid save-restore target feature warning 
Summary:
LLVM issues a warning if passed unknown target features. Neither I nor
@asb noticed this until after https://reviews.llvm.org/D63498 landed.

This patch stops passing the (unknown) "save-restore" target feature to
the LLVM backend, but continues to emit a warning if a driver asks for
`-msave-restore`. The default of assuming `-mno-save-restore` (and
emitting no warnings) remains.

Reviewers: asb

Reviewed By: asb

Subscribers: rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, psnobl, benna, Jim, cfe-commits, asb

Tags: #clang

Differential Revision: https://reviews.llvm.org/D64008

llvm-svn: 364777
 2019-07-01 14:53:56 +00:00
Sam Elliott 3e53e0e4d4 [RISC-V] Add -msave-restore and -mno-save-restore to clang driver 
Summary:
The GCC RISC-V toolchain accepts `-msave-restore` and `-mno-save-restore`
to control whether libcalls are used for saving and restoring the stack within
prologues and epilogues.

Clang currently errors if someone passes -msave-restore or -mno-save-restore.
This means that people need to change build configurations to use clang. This
patch adds these flags, so that clang invocations can now match gcc.

As the RISC-V backend does not currently have a `save-restore` target feature,
we emit a warning if someone requests `-msave-restore`. LLVM does not error if
we pass the (unimplemented) target features `+save-restore` or `-save-restore`.

Reviewers: asb, luismarques

Reviewed By: asb

Subscribers: rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D63498

llvm-svn: 364018
 2019-06-21 10:03:31 +00:00
Shiva Chen e3aaeabb6d [RISCV] Default enable RISCV linker relaxation 
Differential Revision: https://reviews.llvm.org/D47127

llvm-svn: 354222
 2019-02-17 16:05:51 +00:00
Mandeep Singh Grang b0895f04bc Revert "[RISCV] Mark unit tests as "requires: riscv-registered-target"" 
This reverts commit 8908dd12e7bbfc74e264233e900206ad31e285f0.

llvm-svn: 348402
 2018-12-05 19:19:38 +00:00
Mandeep Singh Grang c77dd514ad [RISCV] Mark unit tests as "requires: riscv-registered-target" 
Some of these tests break if the RISCV backend has not been built.

Reland D54816.

llvm-svn: 347720
 2018-11-27 22:53:57 +00:00
Mandeep Singh Grang 02d3ca89bd Revert "[RISCV] Mark unit tests as "requires: riscv-registered-target"" 
This reverts commit 1a6a0c9ea2716378d55858c11adf5941608531f8.

llvm-svn: 347689
 2018-11-27 19:13:52 +00:00
Mandeep Singh Grang bca7192462 [RISCV] Mark unit tests as "requires: riscv-registered-target" 
Summary: Some of these tests break if the RISCV backend has not been built.

Reviewers: asb, apazos, sabuasal

Reviewed By: sabuasal

Subscribers: rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, cfe-commits

Differential Revision: https://reviews.llvm.org/D54816

llvm-svn: 347688
 2018-11-27 19:13:13 +00:00
Shiva Chen f78fc3842f [RISCV] Add -mrelax/-mno-relax flags to enable/disable RISCV linker relaxation 
Differential Revision: https://reviews.llvm.org/D44888

llvm-svn: 333385
 2018-05-29 00:44:15 +00:00
Alex Bradbury 71f45455e1 [RISCV] Add the RISCV target and compiler driver 
As RV64 codegen has not yet been upstreamed into LLVM, we focus on RV32 driver 
support (RV64 to follow).

Differential Revision: https://reviews.llvm.org/D39963

llvm-svn: 322276
 2018-01-11 13:36:56 +00:00