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nv50/ir/ra: improve condition for short regs, unify with cond for 16-bit

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Instead of the size restriction existing in two places, and potentially
being applied twice, we move this together. Ops with 16-bit register
addresses can only take a short reg, and ops with immediates can only
take a short reg.

Of course we leave the immediate 0 in place since we know that it will
be replaced by r63/r127 down the line, so don't treat zeroes as an
immediate.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
This commit is contained in:
Ilia Mirkin 2018-11-11 10:55:55 -05:00
parent 955d943c33
commit 799e021894
1 changed files with 7 additions and 7 deletions
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14
src/gallium/drivers/nouveau/codegen/nv50_ir_ra.cpp
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@ -66,10 +66,8 @@ public:
inline int getMaxAssigned(DataFile f) const { return fill[f]; }
inline unsigned int getFileSize(DataFile f, uint8_t regSize) const
inline unsigned int getFileSize(DataFile f) const
{
if (restrictedGPR16Range && f == FILE_GPR && regSize == 2)
return (last[f] + 1) / 2;
return last[f] + 1;
}
@ -846,9 +844,11 @@ GCRA::printNodeInfo() const
static bool
isShortRegOp(Instruction *insn)
{
// Immediates are always in src1. Every other situation can be resolved by
// Immediates are always in src1 (except zeroes, which end up getting
// replaced with a zero reg). Every other situation can be resolved by
// using a long encoding.
return insn->srcExists(1) && insn->src(1).getFile() == FILE_IMMEDIATE;
return insn->srcExists(1) && insn->src(1).getFile() == FILE_IMMEDIATE &&
insn->getSrc(1)->reg.data.u64;
}
// Check if this LValue is ever used in an instruction that can't be encoded
@ -884,10 +884,10 @@ GCRA::RIG_Node::init(const RegisterSet& regs, LValue *lval)
weight = std::numeric_limits<float>::infinity();
degree = 0;
int size = regs.getFileSize(f, lval->reg.size);
int size = regs.getFileSize(f);
// On nv50, we lose a bit of gpr encoding when there's an embedded
// immediate.
if (regs.restrictedGPR16Range && f == FILE_GPR && isShortRegVal(lval))
if (regs.restrictedGPR16Range && f == FILE_GPR && (lval->reg.size == 2 || isShortRegVal(lval)))
size /= 2;
degreeLimit = size;
degreeLimit -= relDegree[1][colors] - 1;