查看 GCC编译器优化选项的具体信息

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原创最新推荐文章于 2026-03-20 01:50:12 发布 2.9k 阅读 AI 写同款· GEO 优化 ›

gcc编译器优化合理使用 GCC 优化选项可以显著提升程序性能，但需结合场景权衡速度、体积和调试需求。建议逐步启用优化并验证结果，确保代码正确性。在 GCC 中，优化是通过编译选项控制的，目的是提升程序性能（如运行速度、内存占用等），但可能增加编译时间或影响调试体验。：部分优化选项可能不可用（需检查编译器版本）。：未定义行为（UB）被优化暴露。：分模块编译或降低优化级别。或手动禁用某些优化（如。，应指定明确架构（如。：生成函数调用分析。阅读详情

gcc -Q --help=optimizers -O1 >a.txt

The following options control optimizations:
-O<number>
-Os
-falign-functions                   [disabled]
-falign-jumps                       [disabled]
-falign-labels                      [disabled]
-falign-loops                       [enabled]
-fargument-alias                    [enabled]
-fargument-noalias                  [disabled]
-fargument-noalias-anything         [disabled]
-fargument-noalias-global           [disabled]
-fasynchronous-unwind-tables         [enabled]
-fbranch-count-reg                  [enabled]
-fbranch-probabilities              [disabled]
-fbranch-target-load-optimize     [disabled]
-fbranch-target-load-optimize2     [disabled]
-fbtr-bb-exclusive                  [disabled]
-fcaller-saves                      [disabled]
-fcommon                            [enabled]
-fconserve-stack                    [disabled]
-fcprop-registers                   [enabled]
-fcrossjumping                      [disabled]
-fcse-follow-jumps                  [disabled]
-fcx-fortran-rules                  [disabled]
-fcx-limited-range                  [disabled]
-fdata-sections                     [disabled]
-fdce                               [enabled]
-fdefer-pop                         [enabled]
-fdelayed-branch                    [disabled]
-fdelete-null-pointer-checks         [enabled]
-fdse                               [enabled]
-fearly-inlining                    [enabled]
-fexceptions                        [disabled]
-fexpensive-optimizations           [disabled]
-ffinite-math-only                  [disabled]
-ffloat-store                       [disabled]
-fforward-propagate                 [enabled]
-fgcse                              [disabled]
-fgcse-after-reload                 [disabled]
-fgcse-las                          [disabled]
-fgcse-lm                           [enabled]
-fgcse-sm                           [disabled]
-fgraphite-identity                 [disabled]
-fguess-branch-probability         [enabled]
-fhandle-exceptions
-fif-conversion                     [enabled]
-fif-conversion2                    [enabled]
-finline-functions                  [disabled]
-finline-functions-called-once     [enabled]
-finline-small-functions            [disabled]
-fipa-cp                            [disabled]
-fipa-cp-clone                      [disabled]
-fipa-matrix-reorg                  [disabled]
-fipa-pta                           [disabled]
-fipa-pure-const                    [enabled]
-fipa-reference                     [enabled]
-fipa-sra                           [disabled]
-fipa-type-escape                   [disabled]
-fivopts                            [enabled]
-fjump-tables                       [enabled]
-floop-block                        [disabled]
-floop-interchange                  [disabled]
-floop-parallelize-all              [disabled]
-floop-strip-mine                   [disabled]
-flto-report                        [disabled]
-fltrans                            [disabled]
-fmath-errno                        [enabled]
-fmerge-all-constants               [disabled]
-fmerge-constants                   [enabled]
-fmodulo-sched                      [disabled]
-fmove-loop-invariants              [enabled]
-fnon-call-exceptions               [disabled]
-fomit-frame-pointer                [enabled]
-foptimize-register-move            [disabled]
-foptimize-sibling-calls            [disabled]
-fpack-struct                       [disabled]
-fpack-struct=<number>
-fpeel-loops                        [disabled]
-fpeephole                          [enabled]
-fpeephole2                         [disabled]
-fpredictive-commoning              [disabled]
-fprefetch-loop-arrays              [disabled]
-freg-struct-return                 [disabled]
-fregmove                           [disabled]
-frename-registers                  [enabled]
-freorder-blocks                    [disabled]
-freorder-blocks-and-partition     [disabled]
-freorder-functions                 [disabled]
-frerun-cse-after-loop              [disabled]
-freschedule-modulo-scheduled-loops     [disabled]
-frounding-math                     [disabled]
-frtti
-fsched-critical-path-heuristic     [enabled]
-fsched-dep-count-heuristic         [enabled]
-fsched-group-heuristic             [enabled]
-fsched-interblock                  [enabled]
-fsched-last-insn-heuristic         [enabled]
-fsched-pressure                    [disabled]
-fsched-rank-heuristic              [enabled]
-fsched-spec                        [enabled]
-fsched-spec-insn-heuristic         [enabled]
-fsched-spec-load                   [disabled]
-fsched-spec-load-dangerous         [disabled]
-fsched-stalled-insns               [disabled]
-fsched-stalled-insns-dep           [enabled]
-fsched2-use-superblocks            [disabled]
-fschedule-insns                    [disabled]
-fschedule-insns2                   [disabled]
-fsection-anchors                   [disabled]
-fsel-sched-pipelining              [disabled]
-fsel-sched-pipelining-outer-loops     [disabled]
-fsel-sched-reschedule-pipelined     [disabled]
-fselective-scheduling              [disabled]
-fselective-scheduling2             [disabled]
-fset-stack-executable              [enabled]
-fshort-double
-fshort-enums
-fshort-wchar
-fsignaling-nans                    [disabled]
-fsigned-zeros                      [enabled]
-fsingle-precision-constant         [disabled]
-fsplit-ivs-in-unroller             [enabled]
-fsplit-wide-types                  [enabled]
-fstrict-aliasing                   [disabled]
-fthread-jumps                      [disabled]
-fno-threadsafe-statics
-ftoplevel-reorder                  [enabled]
-ftrapping-math                     [enabled]
-ftrapv                             [disabled]
-ftree-builtin-call-dce             [disabled]
-ftree-ccp                          [enabled]
-ftree-ch                           [enabled]
-ftree-copy-prop                    [enabled]
-ftree-copyrename                   [enabled]
-ftree-cselim                       [enabled]
-ftree-dce                          [enabled]
-ftree-dominator-opts               [enabled]
-ftree-dse                          [enabled]
-ftree-forwprop                     [enabled]
-ftree-fre                          [enabled]
-ftree-loop-distribution            [disabled]
-ftree-loop-im                      [enabled]
-ftree-loop-ivcanon                 [enabled]
-ftree-loop-linear                  [disabled]
-ftree-loop-optimize                [enabled]
-ftree-lrs                          [disabled]
-ftree-phiprop                      [enabled]
-ftree-pre                          [disabled]
-ftree-pta                          [enabled]
-ftree-reassoc                      [enabled]
-ftree-scev-cprop                   [enabled]
-ftree-sink                         [enabled]
-ftree-slp-vectorize                [enabled]
-ftree-sra                          [enabled]
-ftree-switch-conversion            [disabled]
-ftree-ter                          [enabled]
-ftree-vect-loop-version            [enabled]
-ftree-vectorize                    [disabled]
-ftree-vrp                          [disabled]
-funit-at-a-time                    [enabled]
-funroll-all-loops                  [disabled]
-funroll-loops                      [disabled]
-funsafe-loop-optimizations         [disabled]
-funsafe-math-optimizations         [disabled]
-funswitch-loops                    [disabled]
-funwind-tables                     [disabled]
-fvar-tracking                      [enabled]
-fvar-tracking-assignments         [enabled]
-fvar-tracking-assignments-toggle     [disabled]
-fvar-tracking-uninit               [disabled]
-fvariable-expansion-in-unroller     [disabled]
-fvect-cost-model                   [enabled]
-fvpt                               [disabled]
-fweb                               [enabled]
-fwhole-program                     [disabled]
-fwpa                               [disabled]
-fwrapv                             [disabled]