[xen master] x86emul: rework compiler probing in the test harness

[patchbot@xxxxxxx]

commit 7c6fdc40a0006a2c5a92387316acf2ba89e703c5
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jun 5 14:53:54 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 5 14:53:54 2023 +0200

    x86emul: rework compiler probing in the test harness
    
    Checking for what $(SIMD) contains was initially right, but already the
    addition of $(FMA) wasn't. Later categories (correctly) weren't added.
    Instead what is of interest is anything the main harness source file
    uses outside of suitable #if and without resorting to .byte, as that's
    the one file (containing actual tests) which has to succeed in building.
    The auxiliary binary blobs we utilize may fail to build; the resulting
    empty blobs are recognized and reported as "n/a" when the harness is
    run.
    
    Note that strictly speaking we'd need to probe the assembler. We assume
    that a compiler knowing of a certain ISA extension is backed by an
    equally capable assembler.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/tests/x86_emulator/Makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/tests/x86_emulator/Makefile 
b/tools/tests/x86_emulator/Makefile
index 4b1f75de05..a6f5bfa53e 100644
--- a/tools/tests/x86_emulator/Makefile
+++ b/tools/tests/x86_emulator/Makefile
@@ -104,11 +104,13 @@ TARGET-y := $(TARGET)
 
 ifeq ($(filter run%,$(MAKECMDGOALS)),)
 
-define simd-check-cc
+define isa-check-cc
 TARGET-$(shell echo 'int i;' | $(CC) -x c -c -o /dev/null -m$(1) - || echo y) 
:=
 endef
 
-$(foreach flavor,$(SIMD) $(FMA),$(eval $(call simd-check-cc,$(flavor))))
+ISA := bmi bmi2 tbm sse4.1 sse4.2 sse4a avx avx2 f16c
+ISA += $(addprefix avx512,f bw dq 4fmaps)
+$(foreach isa,$(ISA),$(eval $(call isa-check-cc,$(isa))))
 
 # Also explicitly check for {evex} pseudo-prefix support, which got introduced
 # only after AVX512F and some of its extensions.
--
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