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authorTom Stellard <[email protected]>2011-10-01 15:22:24 -0700
committerTom Stellard <[email protected]>2011-10-02 15:21:15 -0700
commitd64c6d2ffc086bde7a025269b80c0980f7d908f1 (patch)
tree1217548ef93e5e16d0562d6097ed8a331d0c0093 /docs/relnotes-6.5.2.html
parent13814b0103812adbb5aba0dba4664249e8566290 (diff)
r300/compiler: Fix error in OMOD optimization
Classic compiler mistake. In the example below, the OMOD optimization was combining instructions 4 and 10, but since there was an instruction (#8) in between them that wrote to the same registers as instruction 10, instruction 11 was reading the wrong value. Example of the mistake: Before OMOD: 4: MAD temp[0].y, temp[3]._y__, const[0]._x__, const[0]._y__; ... 8: ADD temp[2].x, temp[1].x___, -temp[4].x___; ... 10: MUL temp[2].x, const[1].y___, temp[0].y___; 11: FRC temp[5].x, temp[2].x___; After OMOD: 4: MAD temp[2].x / 8, temp[3]._y__, const[0]._x__, const[0]._y__; ... 8: ADD temp[2].x, temp[1].x___, -temp[4].x___; ... 11: FRC temp[5].x, temp[2].x___; https://bugs.freedesktop.org/show_bug.cgi?id=41367
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