x86-64 Floating-Point Registers

TotalView : TotalView Reference Guide : PART IV Platforms and Operating Systems : Architectures : AMD and Intel x86-64 : x86-64 Floating-Point Registers

TotalView displays the x86-64 floating point registers in the Registers view. The next table describes how TotalView treats each floating-point register, and the actions you can take with each register.

Register	Description	Data Type	Edit	Dive	Specify in Expression
ST0	ST(0)	$extended	yes	yes	$st0
ST1	ST(1)	$extended	yes	yes	$st1
ST2	ST(2)	$extended	yes	yes	$st2
ST3	ST(3)	$extended	yes	yes	$st3
ST4	ST(4)	$extended	yes	yes	$st4
ST5	ST(5)	$extended	yes	yes	$st5
ST6	ST(6)	$extended	yes	yes	$st6
ST7	ST(7)	$extended	yes	yes	$st7
FPCR	Floating-point control register	$int	yes	no	$fpcr
FPSR	Floating-point status register	$int	no	no	$fpsr
FPTAG	Tag word	$int	no	no	$fptag
FPOP	Floating-point operation	$int	no	no	$fpop
FPI	Instruction address	$int	no	no	$fpi
FPD	Data address	$int	no	no	$fpd
MXCSR	SSE status and control	$int	yes	no	$mxcsr
MXCSR_MASK	MXCSR mask	$int	no	no	$mxcsr_ mask
XMM0_L ... XMM7_L	Streaming SIMD -Extension: left half	$long	yes	yes	$xmm0_l ... $xmm7_l
XMM0_H ... XMM7_H	Streaming SIMD -Extension: right half	$long	yes	yes	$xmm0_h ... $xmm7_h
XMM8_L ... XMM15_L	Streaming SIMD -Extension: left half	$long	yes	yes	$xmm8_l ... $xmm15_l
XMM8_H ... XMM15_H	Streaming SIMD -Extension: right half	$long	yes	yes	$xmm8_h ... $xmm15_h

NOTE: The x86-64 has 16 128-bit registers that are used by SSE and SSE2 instructions. TotalView displays these as 32 64-bit registers. These registers can be used in the following ways: 16 bytes, 8 words, 2 longs, 4 floating point, 2 double, or a single 128-bit value. TotalView shows each of these hardware registers as two $long registers. To change the type, dive and then edit the type in the data window to be an array of the type you wish. For example, cast it to “$char[16]”, “$float[4], and so on.