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Clarify the minimum CPU requirements in README

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The JIT needs SSE2, not just SSE.
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Juan Francisco Cantero Hurtado 2015-04-05 03:49:41 +02:00 committed by Matthew Flatt
parent be1a63cf50
commit 667b9e9b71
1 changed files with 6 additions and 6 deletions
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racket/src/README
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@ -424,13 +424,13 @@ Floating point, x87, SSE, Extflonums, and the JIT
Pre-processor tests in "sconfig.h" and "scheme.h" attempt to determine
when the x87 floating-point processor needs to be configured for
double-precision mode, when JIT can use SSE instructions, and when
extflonums can be supported because both the JIT and C code use SSE
double-precision mode, when JIT can use SSE2 instructions, and when
extflonums can be supported because both the JIT and C code use SSE2
for double-precision floating-point while `long double' is available
for extflonums.
In particular, "scheme.h" looks for __SSE_MATH__ to indicate that gcc
is compiling floating-point operations as SSE, so be sure to include
In particular, "scheme.h" looks for __SSE2_MATH__ to indicate that gcc
is compiling floating-point operations as SSE2, so be sure to include
flags like "-mfpmath=sse" or "-mfpmath=387" in CPPFLAGS, and not just
CFLAGS. See related configuration options below.
@ -446,12 +446,12 @@ options can be modified by setting flags in "racket/sconfig.h".
Some CPP flags control default settings in "racket/sconfig.h":
* MZ_{USE_,NO_}JIT_SSE - {en,dis}ables use of SSE floating point
* MZ_{USE_,NO_}JIT_SSE - {en,dis}ables use of SSE2 floating point
* MZ_USE_DETERMINSTIC_FUEL - disables use of itimer or pthread for
Racket thread scheduling.
* C_COMPILER_USES_SSE - declares that the C compiler is using SSE
* C_COMPILER_USES_SSE - declares that the C compiler is using SSE2
instructions to implement `double' floating-point operations.
Modifying Racket