invoke.texi: Fix typo.
* invoke.texi: Fix typo. * gcc.1: Regenerate. From-SVN: r40351
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Joseph Myers
Joseph Myers
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11642c3a7c
commit
6ca3ad1bc5
@ -1,3 +1,8 @@
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2001-03-09 Joseph S. Myers <jsm28@cam.ac.uk>
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* invoke.texi: Fix typo.
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* gcc.1: Regenerate.
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2001-03-09 Zack Weinberg <zackw@stanford.edu>
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* configure.in: Prune nonexistent files from build_xm_file,
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57
gcc/gcc.1
57
gcc/gcc.1
@ -1,5 +1,5 @@
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.\" Automatically generated by Pod::Man version 1.1
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.\" Mon Feb 19 19:32:03 2001
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.\" Fri Mar 9 21:54:51 2001
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.\"
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.\" Standard preamble:
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.\" ======================================================================
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@ -138,7 +138,7 @@
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.\" ======================================================================
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.\"
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.IX Title "GCC 1"
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.TH GCC 1 "gcc-3.1" "2001-02-19" "GNU"
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.TH GCC 1 "gcc-3.1" "2001-03-09" "GNU"
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.UC
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.SH "NAME"
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gcc \- \s-1GNU\s0 project C and \*(C+ compiler
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@ -280,8 +280,9 @@ in the following sections.
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\&\-finline-functions \-finline-limit=\fR\fIn\fR \fB\-fkeep-inline-functions
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\&\-fkeep-static-consts \-fmove-all-movables
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\&\-fno-default-inline \-fno-defer-pop
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\&\-fno-function-cse \-fno-guess-branch-probability
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\&\-fno-function-cse \-fno-guess-branch-probability
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\&\-fno-inline \-fno-math-errno \-fno-peephole
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\&\-funsafe-math-optimizations \-fno-trapping-math
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\&\-fomit-frame-pointer \-foptimize-register-move
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\&\-foptimize-sibling-calls \-freduce-all-givs
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\&\-fregmove \-frename-registers
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@ -2819,11 +2820,12 @@ that alter the assembler output may be confused by the optimizations
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performed when this option is not used.
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.Ip "\fB\-ffast-math\fR" 4
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.IX Item "-ffast-math"
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This option allows \s-1GCC\s0 to violate some \s-1ISO\s0 or \s-1IEEE\s0 rules and/or
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specifications in the interest of optimizing code for speed. For
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example, it allows the compiler to assume arguments to the \f(CW\*(C`sqrt\*(C'\fR
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function are non-negative numbers and that no floating-point values
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are NaNs.
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Sets \fB\-fno-math-errno\fR, \fB\-funsafe-math-optimizations\fR,
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and \fB\-fno-trapping-math\fR.
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.Sp
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This option causes the preprocessor macro _\|_FAST_MATH_\|_ to be defined.
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.Sp
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This option causes the preprocessor macro _\|_FAST_MATH_\|_ to be defined.
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.Sp
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This option should never be turned on by any \fB\-O\fR option since
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it can result in incorrect output for programs which depend on
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@ -2836,8 +2838,39 @@ with a single instruction, e.g., sqrt. A program that relies on
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\&\s-1IEEE\s0 exceptions for math error handling may want to use this flag
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for speed while maintaining \s-1IEEE\s0 arithmetic compatibility.
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.Sp
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This option should never be turned on by any \fB\-O\fR option since
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it can result in incorrect output for programs which depend on
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an exact implementation of \s-1IEEE\s0 or \s-1ISO\s0 rules/specifications for
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math functions.
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.Sp
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The default is \fB\-fmath-errno\fR. The \fB\-ffast-math\fR option
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sets \fB\-fno-math-errno\fR.
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.Ip "\fB\-funsafe-math-optimizations\fR" 4
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.IX Item "-funsafe-math-optimizations"
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Allow optimizations for floating-point arithmetic that (a) assume
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that arguments and results are valid and (b) may violate \s-1IEEE\s0 or
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\&\s-1ANSI\s0 standards.
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.Sp
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This option should never be turned on by any \fB\-O\fR option since
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it can result in incorrect output for programs which depend on
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an exact implementation of \s-1IEEE\s0 or \s-1ISO\s0 rules/specifications for
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math functions.
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.Sp
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The default is \fB\-fno-unsafe-math-optimizations\fR. The
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\&\fB\-ffast-math\fR option sets \fB\-funsafe-math-optimizations\fR.
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.Ip "\fB\-fno-trapping-math\fR" 4
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.IX Item "-fno-trapping-math"
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Compile code assuming that floating-point operations cannot generate
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user-visible traps. Setting this option may allow faster code
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if one relies on ``non-stop'' \s-1IEEE\s0 arithmetic, for example.
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.Sp
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This option should never be turned on by any \fB\-O\fR option since
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it can result in incorrect output for programs which depend on
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an exact implementation of \s-1IEEE\s0 or \s-1ISO\s0 rules/specifications for
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math functions.
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.Sp
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The default is \fB\-ftrapping-math\fR. The \fB\-ffast-math\fR
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option sets \fB\-fno-trapping-math\fR.
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.PP
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The following options control specific optimizations. The \fB\-O2\fR
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option turns on all of these optimizations except \fB\-funroll-loops\fR
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@ -5851,14 +5884,14 @@ These \fB\-m\fR options are defined for the i386 family of computers:
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Assume the defaults for the machine type \fIcpu type\fR when scheduling
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instructions. The choices for \fIcpu type\fR are \fBi386\fR,
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\&\fBi486\fR, \fBi586\fR, \fBi686\fR, \fBpentium\fR,
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\&\fBpentiumpro\fR, \fBk6\fR, and \fBathlon\fR
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\&\fBpentiumpro\fR, \fBpentium4\fR, \fBk6\fR, and \fBathlon\fR
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.Sp
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While picking a specific \fIcpu type\fR will schedule things appropriately
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for that particular chip, the compiler will not generate any code that
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does not run on the i386 without the \fB\-march=\fR\fIcpu type\fR option
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being used. \fBi586\fR is equivalent to \fBpentium\fR and \fBi686\fR
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is equivalent to \fBpentiumpro\fR. \fBk6\fR is the \s-1AMD\s0 chip as
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opposed to the Intel ones.
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is equivalent to \fBpentiumpro\fR. \fBk6\fR and \fBathlon\fR are the
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\&\s-1AMD\s0 chips as opposed to the Intel ones.
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.Ip "\fB\-march=\fR\fIcpu type\fR" 4
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.IX Item "-march=cpu type"
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Generate instructions for the machine type \fIcpu type\fR. The choices
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@ -5917,7 +5950,7 @@ Some 387 emulators do not support the \f(CW\*(C`sin\*(C'\fR, \f(CW\*(C`cos\*(C'\
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\&\f(CW\*(C`sqrt\*(C'\fR instructions for the 387. Specify this option to avoid
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generating those instructions. This option is the default on FreeBSD.
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As of revision 2.6.1, these instructions are not generated unless you
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also use the \fB\-ffast-math\fR switch.
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also use the \fB\-funsafe-math-optimizations\fR switch.
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.Ip "\fB\-malign-double\fR" 4
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.IX Item "-malign-double"
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.PD 0
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@ -6573,7 +6573,7 @@ While picking a specific @var{cpu type} will schedule things appropriately
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for that particular chip, the compiler will not generate any code that
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does not run on the i386 without the @samp{-march=@var{cpu type}} option
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being used. @samp{i586} is equivalent to @samp{pentium} and @samp{i686}
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is equivalent to @samp{pentiumpro}. @samp{k6} and @samp{athlon} sre the
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is equivalent to @samp{pentiumpro}. @samp{k6} and @samp{athlon} are the
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AMD chips as opposed to the Intel ones.
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@item -march=@var{cpu type}
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