gc: new typechecking rules

* Code for assignment, conversions now mirrors spec.
* Changed some snprint -> smprint.
* Renamed runtime functions to separate
  interface conversions from type assertions:
  convT2I, assertI2T, etc.
* Correct checking of \U sequences.

Fixes issue 840.
Fixes issue 830.
Fixes issue 778.

R=ken2
CC=golang-dev
http://codereview.appspot.com/1303042

1 files changed, 67 insertions, 0 deletions

diff --git a/src/pkg/math/fltasm_amd64.s b/src/pkg/math/fltasm_amd64.s
new file mode 100644
index 000000000..66442cd30
--- /dev/null
+++ b/src/pkg/math/fltasm_amd64.s
@@ -0,0 +1,67 @@
+// Derived from Inferno's libkern/getfcr-amd64.s
+// http://code.google.com/p/inferno-os/source/browse/libkern/getfcr-amd64.s
+//
+//         Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
+//         Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
+//         Portions Copyright 2009 The Go Authors. All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+TEXT	·SetFPControl(SB), 7, $8
+	// Set new
+	MOVL	p+0(FP), DI
+	XORL	$(0x3F<<7), DI
+	ANDL	$0xFFC0, DI
+	WAIT
+	STMXCSR	0(SP)
+	MOVL	0(SP), AX
+	ANDL	$~0x3F, AX
+	ORL	DI, AX
+	MOVL	AX, 0(SP)
+	LDMXCSR	0(SP)
+	RET
+
+TEXT	·GetFPControl(SB), 7, $0
+	WAIT
+	STMXCSR	0(SP)
+	MOVWLZX	0(SP), AX
+	ANDL	$0xFFC0, AX
+	XORL	$(0x3F<<7), AX
+	MOVL	AX, ret+0(FP)
+	RET
+
+TEXT	·SetFPStatus(SB), $0
+	MOVL	p+0(FP), DI
+	ANDL	$0x3F, DI
+	WAIT
+	STMXCSR	0(SP)
+	MOVL	0(SP), AX
+	ANDL	$~0x3F, AX
+	ORL	DI, AX
+	MOVL	AX, 0(SP)
+	LDMXCSR	0(SP)
+	RET
+
+TEXT	·GetFPStatus(SB), $0
+	WAIT
+	STMXCSR	0(SP)
+	MOVL	0(SP), AX
+	ANDL	$0x3F, AX
+	MOVL	AX, ret+0(FP)
+	RET