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authorChristoph Bumiller <e0425955@student.tuwien.ac.at>2014-09-05 23:52:45 +0200
committerIlia Mirkin <imirkin@alum.mit.edu>2014-09-05 23:05:42 -0400
commitb9f9e3ce03dbd8d044a72a00e1e8856a500b5f72 (patch)
treef9349414c1b8144faf622c60d82116ae8e9e8496 /src/gallium/drivers
parenta71380040c6bce92dfbe934e3b7dc8332bf22142 (diff)
nv50/ir/util: fix BitSet issues
BitSet::allocate() is being used with the expectation that it would leave the bitfield untouched if its size hasn't changed, however, the function always zeroed the last word, which led to obscure bugs with live set computation. This also fixes BitSet::resize(), which was broken, but luckily not being used. Cc: "10.2 10.3" <mesa-stable@lists.freedesktop.org> Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Diffstat (limited to 'src/gallium/drivers')
-rw-r--r--src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp4
-rw-r--r--src/gallium/drivers/nouveau/codegen/nv50_ir_util.cpp8
-rw-r--r--src/gallium/drivers/nouveau/codegen/nv50_ir_util.h1
3 files changed, 10 insertions, 3 deletions
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
index 5ab6570175d..4b105b453c3 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
@@ -1657,6 +1657,10 @@ RegAlloc::execFunc()
ret && i <= func->loopNestingBound;
sequence = func->cfg.nextSequence(), ++i)
ret = buildLiveSets(BasicBlock::get(func->cfg.getRoot()));
+ // reset marker
+ for (ArrayList::Iterator bi = func->allBBlocks.iterator();
+ !bi.end(); bi.next())
+ BasicBlock::get(bi)->liveSet.marker = false;
if (!ret)
break;
func->orderInstructions(this->insns);
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_util.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_util.cpp
index 895977710ca..d26acb304bc 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_util.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_util.cpp
@@ -254,7 +254,9 @@ bool BitSet::resize(unsigned int nBits)
return false;
}
if (n > p)
- memset(&data[4 * p + 4], 0, (n - p) * 4);
+ memset(&data[p], 0, (n - p) * 4);
+ if (nBits < size && (nBits % 32))
+ data[(nBits + 31) / 32 - 1] &= (1 << (nBits % 32)) - 1;
size = nBits;
return true;
@@ -274,8 +276,8 @@ bool BitSet::allocate(unsigned int nBits, bool zero)
if (zero)
memset(data, 0, (size + 7) / 8);
else
- if (nBits)
- data[(size + 31) / 32 - 1] = 0; // clear unused bits (e.g. for popCount)
+ if (size % 32) // clear unused bits (e.g. for popCount)
+ data[(size + 31) / 32 - 1] &= (1 << (size % 32)) - 1;
return data;
}
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_util.h b/src/gallium/drivers/nouveau/codegen/nv50_ir_util.h
index a4ea9d981e0..fa2c4804a42 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_util.h
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_util.h
@@ -484,6 +484,7 @@ public:
FREE(data);
}
+ // allocate will keep old data iff size is unchanged
bool allocate(unsigned int nBits, bool zero);
bool resize(unsigned int nBits); // keep old data, zero additional bits