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nvptx: Add effective-target 'nvptx_softstack', use for effective-target 'alloca'

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..., and thereby making the check for effective-target 'alloca' more explicit.
As of commit 5012919d0b (Subversion r242503)
"nvptx backend prerequisites for OpenMP offloading", the check for
effective-target 'alloca' did "use a compile test"; let's make this more
explicit: supported for '-msoft-stack', not supported otherwise.

	gcc/testsuite/
	* lib/target-supports.exp
	(check_effective_target_nvptx_softstack): New.
	(check_effective_target_alloca) [nvptx]: Use it.
	gcc/
	* doc/sourcebuild.texi (Effective-Target Keywords): Document
	'nvptx_softstack'.
This commit is contained in:
Thomas Schwinge 2024-12-16 11:48:11 +01:00
parent e5180fbcbc
commit 975638b2d7
2 changed files with 18 additions and 4 deletions
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3
gcc/doc/sourcebuild.texi
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@ -2433,6 +2433,9 @@ nvptx code by default compiles for at least PTX ISA version 6.0.
@item nvptx_runtime_alias_ptx
The nvptx runtime environment supports the PTX ISA directive
@code{.alias}.
@item nvptx_softstack
nvptx @option{-msoft-stack} is enabled.
@end table
@subsubsection PowerPC-specific attributes

19
gcc/testsuite/lib/target-supports.exp
View file

@ -1009,10 +1009,11 @@ proc check_effective_target_alloca {} {
return 0
}
if { [istarget nvptx-*-*] } {
return [check_no_compiler_messages alloca assembly {
void f (void*);
void g (int n) { f (__builtin_alloca (n)); }
}]
if { ![check_effective_target_nvptx_softstack] } {
return 0
} else {
return 1
}
}
return 1
}
@ -14099,6 +14100,16 @@ proc check_effective_target_nvptx_default_ptx_isa_version_at_least_6_0 { } {
return [check_nvptx_default_ptx_isa_version_at_least 6 0]
}
# Return 1 if nvptx '-msoft-stack' is enabled.
proc check_effective_target_nvptx_softstack { } {
return [check_no_compiler_messages nvptx_softstack assembly {
#if !defined(__nvptx_softstack__)
#error !__nvptx_softstack__
#endif
}]
}
# Return 1 if nvptx code with PTX ISA version major.minor or higher can be run.
proc check_nvptx_runtime_ptx_isa_version_at_least { major minor } {