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comparison extra/README @ 396:d0c0fede5021
Update to gcc6809lw patch which may help compilation of some sources
Due to persistent random compiler crashes and errors related to "M_REGS",
this patch update (4.6.4-2) essentially removes the varius constraints
allowing the "soft registers" in most operations. It was causing more
problems than it solved and it is not clear that the logic behind those soft
registers even makes sense any more.
This patch also fixes a bogus comparison related to selecting the right size
for a constant. Instead of the excessively clever comparison scheme that was
previously in use, the comparisons have been replaced with straight forward
comparisions for the top and bottom of the relevant 2's complement ranges.
author | William Astle <lost@l-w.ca> |
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date | Mon, 20 Jul 2015 22:32:41 -0600 |
parents | b0fb675d1ed4 |
children | c8ae69cdb5a9 |
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395:26d2791672b1 | 396:d0c0fede5021 |
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14 | 14 |
15 ar | 15 ar |
16 | 16 |
17 Similar to the "as" script above except for lwar. | 17 Similar to the "as" script above except for lwar. |
18 | 18 |
19 gcc6809lw-4.6.1-1.patch | 19 gcc6809lw-*.patch |
20 gcc6809lw-4.6.4-1.patch | |
21 | 20 |
22 These are patches to the main gcc source distribution for specific releases. | 21 These are patches to the main gcc source distribution for specific releases. |
23 The last number after the dash is a patch level for the specific patch. It | 22 The last number after the dash is a patch level for the specific patch. It |
24 is worth noting that a patch for a particular minor version of GCC may work | 23 is worth noting that a patch for a particular minor version of GCC may work |
25 with later minor versions in the same release sequence. That is, a patch | 24 with later minor versions in the same release sequence. That is, a patch |
91 | 90 |
92 8. Run "make install". Note that you will have to have your PATH variable | 91 8. Run "make install". Note that you will have to have your PATH variable |
93 for "root" set up correctly if your install prefix requires root privileges. | 92 for "root" set up correctly if your install prefix requires root privileges. |
94 | 93 |
95 The above is WOMM certified. YMMV. | 94 The above is WOMM certified. YMMV. |
95 | |
96 NOTES ABOUT SPECIFIC PATCHES | |
97 ============================ | |
98 | |
99 gcc6809lw-4.6.4-2.patch | |
100 | |
101 This patch essentially disables the "soft registers". These were causing | |
102 problems leading to compiler crashes. Removing the "t" constraint from | |
103 the instruction patterns allowed various issues to go away. It is not clear | |
104 if the original reasoning behind these soft registers is even valid any | |
105 more. | |
106 | |
107 Also fixes a clearly incorrect comparision when determining if a constant | |
108 fits in 16 bits. For clarity, both the 8 bit and 16 bit comparisons are | |
109 replaced with straight forward range comparisons rather than the excessively | |
110 clever scheme that was present before. |