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cmd/dist, cmd/8g: implement GO386=387/sse to choose FPU flavour.

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A new environment variable GO386 is introduced to choose between
code generation targeting 387 or SSE2. No auto-detection is
performed and the setting defaults to 387 to preserve previous
behaviour.

The patch is a reorganization of CL6549052 by rsc.

Fixes #3912.

R=minux.ma, rsc
CC=golang-dev
https://golang.org/cl/6962043
This commit is contained in:
Rémy Oudompheng 2013-01-02 22:55:23 +01:00
parent 64a0017d6e
commit 9afb34b42e
12 changed files with 1005 additions and 263 deletions
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1
include/libc.h
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@ -290,6 +290,7 @@ extern char* getgoarch(void);
extern char* getgoroot(void);
extern char* getgoversion(void);
extern char* getgoarm(void);
extern char* getgo386(void);
#ifdef _WIN32