FLAG DESCRIPTIONS SUN C AND FORTRAN SC4.3 -Bstatic Specify static binding -dalign Assume double-type data is double aligned -depend Enable all dependence based transformations -dn Specify static binding -fsimple Allow the optimizer to use mathematically equivalent expressions -ftrap=tset Use the IEEE trapping modes in effect at startup -libmil Use inline expansion templates for libm -native Ascertain available machine characteristics generate code accordingly -xO4 Generate optimized code. See -O4 below. -xO5 Generate optimized code. See -O5 below. -pad[=

] Pad local variables or common blocks, or both, for efficient use of the cache -unroll=X Suggestion to optimizer to unroll loops X times -Xa Compile assuming ANSI C conformance, allow K & Rons (default mode) -Xc Compile assuming strict ANSI C conformance -xarch= Limit the set of instructions the compiler may use to (generic,v7,v8a,v8,v8plus,v8plusa) -xcache= Define the cache properties for use by the optimizer (16/32/4:512/64/1) -xchip= Define the instruction scheduling properties for use by the optimizer (ultra) -xcrossfile enable cross-file inlining. -xlibmopt Link with -lmopt and -lcopt in proper order -xprofile=use Use data collected for profile feedback -xprofile=collect Collect profile data for feedback directed optimizations. -xparallel Use parallel processing to improve performance -xreduction Parallelize loops containing reductions -xsafe=mem Optimizes for prefetch instructions, and when the flag -xarch=v8plus is set, assumes that no memory based traps will occur -xsfpconst Represent unsuffixed floating point constants as single precision -xtarget= Machine target for compilation. -fast Fast execution. Select the combination of compilation options that optimizes for speed of execution without excessive compilation time. This is a convenience option, and it chooses: o The -native best machine characteristics option o Optimization level: -O3 o A set of inline expansion templates o The -fsimple option o The -dalign option (SPARC only) o The -xlibmopt option (SPARC only) In Solaris 2.x only, the -fast option includes -fns -ftrap=%none; that is, turn off all trapping. -xO4: Besides what -O3 does, this option does automatic inlining of functions in the same file. The code usually runs faster, but for some code, -O4 makes it run more slowly. -g suppresses automatic inlining. In general, -O4 results in larger code. -xO5 Besides what -xO4 does, enables speculative code motion. -xrestrict[=f1,...,f2,%all, %none] Treat pointer-valued function parameters as restricted pointers. This command-line option can be used on its own, but is best used with optimization. The default is %none. Specifying -xrestrict is equivalent to specifying -xrestrict=%all. -Qoption Pass flags along to compiler phase: cg Code generator f77pass1 Fortran first pass iropt Internal representation optimizer -W, Pass flags along to compiler phase: 2 Second pass c code generator -Qoption cg -Qms_pipe+nfll=5 heuristic to select shallow nodes for critical path scheduling -Qoption cg -Qpeep-Sh0-Hl1 Don't hoist instructions beyond loop headers -Qoption cg -stdio Strength reduce printf("%c",...) into putc -Qoption f77pass1 -cbasereg Use a common base register to address static data -Qoption iropt -O4+ansi_alias Assume (more restrictive) ANSI C semantics for pointer aliasing -Qoption iropt -O4+restrict Same as -xrestrict -Qoption iropt -O4+restrict_g makes global pointer values as if they were restricted pointers (See also -xrestrict) -Qoption iropt -O4+vector enable vectorization of loops with calls to math routines -W2,-fsimple=2 perform aggresive floating point simplification and optimizations. -W2,-Mp1000 Procedures with entry counts equal or greater than 1000 become candidates for inlining. -W2,-Ms1 set the inline recursion level to 1, i.e. inline recursive routines one level. -W2,-Mt600 The maximum size of a routine body elegible for inlining is limited to 600 triples. -W2,-Mr1500 Restrict maximum size increase due to inlining to 1500 triples -W2,-O4+pde enable aggressive dead code elimination -W2,-O4+cond_elim enable aggresive optimizations of conditional branches -W2,-O4+bopt enable aggresive optimizations of all branches -W2,-whole use whole program mode -W2,-ANSI_S use ANSI semantics for routines with hidden control flow (e.g. setjmp) -Wc,-QrmT1 enable allocation of global registers -Wc,-HLnxyhwbli Use aggressive scheduling strategy for ALU instructions -Wc,-Qicache-L1-bsize=4-bbits=7 do L1 instruction cache alignment -Wc,-Qiselect-funcalign=16 do function entry alignment at 16 byte boundaries. -Wc,-Qpeep-Ex:use_int64=1 use 64 bit integer registers where appropriate -Wc,-Qpeep-Sb0,-Qpeep-Cl1 use profile data for block reordering -Wc,-Qiselect-sw_pf_tbl_th=20 Peels 20 branches/cases preceding an indirect branch type of switch. This is effective only when profile feedback is used. -xdepend Same as -xdepend. Needed for C. -lmvec Vectorized version of the math library