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We will need integer saturation functions also in SSE2 instructions

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This commit is contained in:
Stanislav Shwartsman 2002-11-02 12:35:33 +00:00
parent 22d292d83f
commit 0e60aa8232
2 changed files with 40 additions and 4 deletions
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8
bochs/cpu/mmx.cc
View File

@ -40,7 +40,7 @@
MMX_REGFILE.mmx[index].exp = 0xffff; \
}
static Bit8s SaturateWordSToByteS(Bit16s value)
Bit8s SaturateWordSToByteS(Bit16s value)
{
/*
SaturateWordSToByteS converts a signed 16-bit value to a
@ -53,7 +53,7 @@ static Bit8s SaturateWordSToByteS(Bit16s value)
return value;
}
static Bit16s SaturateDwordSToWordS(Bit32s value)
Bit16s SaturateDwordSToWordS(Bit32s value)
{
/*
SaturateDwordSToWordS converts a signed 32-bit value to a
@ -67,7 +67,7 @@ static Bit16s SaturateDwordSToWordS(Bit32s value)
return value;
}
static Bit8u SaturateWordSToByteU(Bit16s value)
Bit8u SaturateWordSToByteU(Bit16s value)
{
/*
SaturateWordSToByteU converts a signed 16-bit value to an
@ -80,7 +80,7 @@ static Bit8u SaturateWordSToByteU(Bit16s value)
return value;
}
static Bit16u SaturateDwordSToWordU(Bit32s value)
Bit16u SaturateDwordSToWordU(Bit32s value)
{
/*
SaturateDwordSToWordU converts a signed 32-bit value

36
bochs/cpu/xmm.h
View File

@ -88,4 +88,40 @@ struct bx_mxcsr_t {
#define MXCSR_MASK 0x00ff /* reset reserved bits */
#define MXCSR_RESET 0x1f80 /* reset value of the MXCSR register */
/* INTEGER SATURATION */
/*
SaturateWordSToByteS converts a signed 16-bit value to a
signed 8-bit value. If the signed 16-bit value is less than -128, it
is represented by the saturated value -128 (0x80). If it is greater
than 127, it is represented by the saturated value 127 (0x7F).
*/
Bit8s SaturateWordSToByteS(Bit16s value);
/*
SaturateDwordSToWordS converts a signed 32-bit value to a
signed 16-bit value. If the signed 32-bit value is less than -32768,
it is represented by the saturated value -32768 (0x8000). If it is
greater than 32767, it is represented by the saturated value 32767
(0x7FFF).
*/
Bit16s SaturateDwordSToWordS(Bit32s value);
/*
SaturateWordSToByteU converts a signed 16-bit value to an
unsigned 8-bit value. If the signed 16-bit value is less than zero it
is represented by the saturated value zero (0x00).If it is greater
than 255 it is represented by the saturated value 255 (0xFF).
*/
Bit8u SaturateWordSToByteU(Bit16s value);
/*
SaturateDwordSToWordU converts a signed 32-bit value
to an unsigned 16-bit value. If the signed 32-bit value is less
than zero, it is represented by the saturated value 65535
(0x0000). If it is greater than 65535, it is represented by
the saturated value 65535 (0xFFFF).
*/
Bit16u SaturateDwordSToWordU(Bit32s value);
#endif