diff options
author | Christoph Bumiller <[email protected]> | 2012-01-07 21:00:51 +0100 |
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committer | Christoph Bumiller <[email protected]> | 2012-01-10 00:39:12 +0100 |
commit | 4021979182d3a6eb2bed1e9d784e218eb88bfa28 (patch) | |
tree | 45469639e6d2c17801552f105fb8e1813d7f3283 /src/gallium | |
parent | 601fb4b746ac498e69356fba0c17a1f6ce78df6c (diff) |
nv50/ir/ra: don't coalesce contraint-moves
This could lead to incorrect code when fixed regs are involved.
Surprisingly, the increased freedom actually leads to lower
register usage in some cases. Still want to find a better way
to treat constraints though ...
Diffstat (limited to 'src/gallium')
-rw-r--r-- | src/gallium/drivers/nv50/codegen/nv50_ir_ra.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/gallium/drivers/nv50/codegen/nv50_ir_ra.cpp b/src/gallium/drivers/nv50/codegen/nv50_ir_ra.cpp index ff6d9666a19..f08026cf844 100644 --- a/src/gallium/drivers/nv50/codegen/nv50_ir_ra.cpp +++ b/src/gallium/drivers/nv50/codegen/nv50_ir_ra.cpp @@ -513,6 +513,10 @@ RegAlloc::coalesceValues(unsigned int mask) case OP_MOV: if (!(mask & JOIN_MASK_MOV)) break; + i = insn->getDef(0)->uses ? insn->getDef(0)->uses->getInsn() : NULL; + // if this is a contraint-move there will only be a single use + if (i && i->op == OP_CONSTRAINT) + break; i = insn->getSrc(0)->getUniqueInsn(); if (i && !i->constrainedDefs()) insn->getDef(0)->coalesce(insn->getSrc(0), false); |