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Use 16-bit computations for shifts, where possible.

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This causes ORCA/C to generate better code, using shift instructions rather than function calls.
This commit is contained in:
Stephen Heumann 2015-09-26 01:24:58 -05:00
parent 8861cb4a3a
commit 59a3bf938c
1 changed files with 13 additions and 13 deletions
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26
mouse.cc
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@ -208,14 +208,14 @@ void DoCursor (void) {
for (j = 0; j < bitmaskLineBytes; j++) {
bitmaskByte = *(bitmask + line*bitmaskLineBytes + j);
outBytes320 =
((bitmaskByte & 0x80) ) + ((bitmaskByte & 0x80) >> 1) +
((bitmaskByte & 0x80) >> 2) + ((bitmaskByte & 0x80) >> 3) +
((bitmaskByte & 0x40) >> 3) + ((bitmaskByte & 0x40) >> 4) +
((bitmaskByte & 0x40) >> 5) + ((bitmaskByte & 0x40) >> 6) +
((bitmaskByte & 0x20) << 10) + ((bitmaskByte & 0x20) << 9) +
((bitmaskByte & 0x20) << 8) + ((bitmaskByte & 0x20) << 7) +
((bitmaskByte & 0x10) << 7) + ((bitmaskByte & 0x10) << 6) +
((bitmaskByte & 0x10) << 5) + ((bitmaskByte & 0x10) << 4) +
(((unsigned)bitmaskByte & 0x80) ) + (((unsigned)bitmaskByte & 0x80) >> 1) +
(((unsigned)bitmaskByte & 0x80) >> 2) + (((unsigned)bitmaskByte & 0x80) >> 3) +
(((unsigned)bitmaskByte & 0x40) >> 3) + (((unsigned)bitmaskByte & 0x40) >> 4) +
(((unsigned)bitmaskByte & 0x40) >> 5) + (((unsigned)bitmaskByte & 0x40) >> 6) +
(((unsigned)bitmaskByte & 0x20) << 10) + (((unsigned)bitmaskByte & 0x20) << 9) +
(((unsigned)bitmaskByte & 0x20) << 8) + (((unsigned)bitmaskByte & 0x20) << 7) +
(((unsigned)bitmaskByte & 0x10) << 7) + (((unsigned)bitmaskByte & 0x10) << 6) +
(((unsigned)bitmaskByte & 0x10) << 5) + (((unsigned)bitmaskByte & 0x10) << 4) +
((bitmaskByte & 0x08) << 20) + ((bitmaskByte & 0x08) << 19) +
((bitmaskByte & 0x08) << 18) + ((bitmaskByte & 0x08) << 17) +
((bitmaskByte & 0x04) << 17) + ((bitmaskByte & 0x04) << 16) +
@ -252,11 +252,11 @@ void DoCursor (void) {
for (j = 0; j < bitmaskLineBytes; j++) {
bitmaskByte = *(bitmask + line*bitmaskLineBytes + j);
outBytes640 =
((bitmaskByte & 0x80) ) + ((bitmaskByte & 0xC0) >> 1) +
((bitmaskByte & 0x60) >> 2) + ((bitmaskByte & 0x30) >> 3) +
((bitmaskByte & 0x10) >> 4) + ((bitmaskByte & 0x08) << 12) +
((bitmaskByte & 0x0C) << 11) + ((bitmaskByte & 0x06) << 10) +
((bitmaskByte & 0x03) << 9) + ((bitmaskByte & 0x01) << 8);
(((unsigned)bitmaskByte & 0x80) ) + (((unsigned)bitmaskByte & 0xC0) >> 1) +
(((unsigned)bitmaskByte & 0x60) >> 2) + (((unsigned)bitmaskByte & 0x30) >> 3) +
(((unsigned)bitmaskByte & 0x10) >> 4) + (((unsigned)bitmaskByte & 0x08) << 12) +
(((unsigned)bitmaskByte & 0x0C) << 11) + (((unsigned)bitmaskByte & 0x06) << 10) +
(((unsigned)bitmaskByte & 0x03) << 9) + (((unsigned)bitmaskByte & 0x01) << 8);
*((unsigned int *)maskLine + j) = outBytes640;
}
*((unsigned int *)maskLine + lineWords - 1) = 0;