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[nvptx] Set -misa=sm_35 by default 

The nvptx-as assembler verifies the ptx code using ptxas, if there's any
in the PATH.

The default in the nvptx port for -misa=sm_xx is sm_30, but the ptxas of the
latest cuda release (11.1) no longer supports sm_30.

Consequently we cannot build gcc against that release (although we should
still be able to build without any cuda release).

Fix this by setting -misa=sm_35 by default.

Tested check-gcc on nvptx.

Tested libgomp on x86_64-linux with nvpx accelerator.

Both build again cuda 9.1.

gcc/ChangeLog:

2020-10-09  Tom de Vries  <tdevries@suse.de>

	PR target/97348
	* config/nvptx/nvptx.h (ASM_SPEC): Also pass -m to nvptx-as if
	default is used.
	* config/nvptx/nvptx.opt (misa): Init with PTX_ISA_SM35.
This commit is contained in:
Tom de Vries 2020-10-09 11:36:10 +02:00
parent 8c26cfc6af
commit 383400a607
2 changed files with 6 additions and 2 deletions
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5
gcc/config/nvptx/nvptx.h
View File

@ -29,7 +29,10 @@
#define STARTFILE_SPEC "%{mmainkernel:crt0.o}"
#define ASM_SPEC "%{misa=*:-m %*}"
/* Default needs to be in sync with default for misa in nvptx.opt.
We add a default here to work around a hard-coded sm_30 default in
nvptx-as. */
#define ASM_SPEC "%{misa=*:-m %*; :-m sm_35}"
#define TARGET_CPU_CPP_BUILTINS() \
do \

3
gcc/config/nvptx/nvptx.opt
View File

@ -59,6 +59,7 @@ Enum(ptx_isa) String(sm_30) Value(PTX_ISA_SM30)
EnumValue
Enum(ptx_isa) String(sm_35) Value(PTX_ISA_SM35)
; Default needs to be in sync with default in ASM_SPEC in nvptx.h.
misa=
Target RejectNegative ToLower Joined Enum(ptx_isa) Var(ptx_isa_option) Init(PTX_ISA_SM30)
Target RejectNegative ToLower Joined Enum(ptx_isa) Var(ptx_isa_option) Init(PTX_ISA_SM35)
Specify the version of the ptx ISA to use.