[Xen-devel] [PATCH] x86/CPUID: adjust SSEn dependencies

["Jan Beulich" <JBeulich@xxxxxxxx>]

Along the lines of b9f6395590 ("x86/cpuid: adjust dependencies of
post-SSE ISA extensions") further convert SSEn dependencies to be more
chain like, with each successor addition depending on its immediate
predecessor. This is more in line with how hardware has involved, and
how other projects like gcc and binutils connect things together.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/tools/gen-cpuid.py
+++ b/xen/tools/gen-cpuid.py
@@ -196,18 +196,16 @@ def crunch_numbers(state):
         # instructions.  Several futher instruction sets are built on core
         # %XMM support, without specific inter-dependencies.  Additionally
         # AMD has a special mis-alignment sub-mode.
-        SSE: [SSE2, SSE3, SSSE3, SSE4A, MISALIGNSSE],
+        SSE: [SSE2, MISALIGNSSE],
 
         # SSE2 was re-specified as core instructions for 64bit.  Also ISA
         # extensions dealing with vectors of integers are added here rather
         # than to SSE.
-        SSE2: [LM, AESNI, PCLMULQDQ, SHA],
+        SSE2: [SSE3, LM, AESNI, PCLMULQDQ, SHA],
 
-        # SSE4.1 explicitly depends on SSE3 and SSSE3
-        SSE3: [SSE4_1],
-        SSSE3: [SSE4_1],
-
-        # SSE4.2 explicitly depends on SSE4.1
+        # Other SSEn each depend on their predecessor versions.
+        SSE3: [SSSE3],
+        SSSE3: [SSE4_1, SSE4A],
         SSE4_1: [SSE4_2],
 
         # AMD specify no relationship between POPCNT and SSE4.2.  Intel





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