From 39931bcfa9cbff3d172ae56dc65b530316717ab8 Mon Sep 17 00:00:00 2001 From: Zack Weinberg Date: Tue, 27 Jul 2004 21:41:23 +0000 Subject: * libgcc2.c: Change all conditionals testing LIBGCC2_LONG_DOUBLE_TYPE_SIZE == 96 to == 80. * libgcc2.h: Likewise. * config/i386/i386.c (ix86_init_mmx_sse_builtins): Set TYPE_PRECISION of float80_type to 80. * config/ia64/ia64.c (ia64_init_builtins): Set TYPE_PRECISION of fpreg_type and float80_type to 80. * config/i386/i386.h, config/ia64/ia64.h, config/m68k/m68k.h * config/m68k/netbsd-elf.h: Change LONG_DOUBLE_TYPE_SIZE and possibly LIBGCC2_LONG_DOUBLE_TYPE_SIZE to evaluate to 80 whenever they would formerly have evaluated to 96. * config/i386/sco5.h: Remove unnecessary redefinition of LONG_DOUBLE_TYPE_SIZE. * doc/rtl.texi: Clarify uses of XFmode and TFmode. * config/i386/i386-modes.def: Use FRACTIONAL_FLOAT_MODE for XFmode, with a bitsize of 80. Update commentary. * config/ia64/ia64-modes.def: Likewise. * config/m68k/m68k-modes.def: Likewise. git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@85232 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/doc/rtl.texi | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'gcc/doc/rtl.texi') diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi index 422f6d6d5e7..210e1823dbf 100644 --- a/gcc/doc/rtl.texi +++ b/gcc/doc/rtl.texi @@ -1100,15 +1100,16 @@ this is a double-precision IEEE floating point number. @findex XFmode @item XFmode -``Extended Floating'' mode represents a twelve byte floating point -number. This mode is used for IEEE extended floating point. On some -systems not all bits within these bytes will actually be used. +``Extended Floating'' mode represents an IEEE extended floating point +number. This mode only has 80 meaningful bits (ten bytes). Some +processors require such numbers to be padded to twelve bytes, others +to sixteen; this mode is used for either. @findex TFmode @item TFmode -``Tetra Floating'' mode represents a sixteen byte floating point number. -This gets used for both the 96-bit extended IEEE floating-point types -padded to 128 bits, and true 128-bit extended IEEE floating-point types. +``Tetra Floating'' mode represents a sixteen byte floating point number +all 128 of whose bits are meaningful. One common use is the +IEEE quad-precision format. @findex CCmode @item CCmode -- cgit v1.2.3