llvm-project/clang/test/Driver/x86_features.c

// RUN: %clang -target i386-unknown-unknown -### -S %s -msse -msse4 -mno-sse -mno-mmx -msse 2> %t
// RUN: grep '"pentium4" "-target-feature" "+sse4" "-target-feature" "-mmx" "-target-feature" "+sse"' %t
// Note that we filter out all but the last -m(no)sse.
rename -ccc-host-triple into -target llvm-svn: 148582 2012-01-21 06:01:23 +08:00			`// RUN: %clang -target i386-unknown-unknown -### -S %s -msse -msse4 -mno-sse -mno-mmx -msse 2> %t`
Make clang behave in a gcc-compatible way in the presence of multiple flags for the same x86 target feature (e.g. -mno-sse -msse). gcc uses a somewhat unintuitive algorithm here in that the enabled SSE instructions is based on the order of the last flag for each feature-level, so that "-mno-sse -msse2" only enables SSE2, but "-mno-sse -msse2 -msse" enables all SSE levels. Issue reported on cfe-dev. llvm-svn: 134296 2011-07-02 08:34:19 +08:00			`// RUN: grep '"pentium4" "-target-feature" "+sse4" "-target-feature" "-mmx" "-target-feature" "+sse"' %t`
			`// Note that we filter out all but the last -m(no)sse.`