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Fix WavePrefixCountBits() being off by one.

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It was counting bits up to the current lane included, whereas the
documentation says it should be excluded. This now matches dxc's behavior
as well.

Fix #2929
This commit is contained in:
Ryp 2022-04-21 22:05:17 +03:00
parent 06ac141412
commit f906b895ec
2 changed files with 5 additions and 5 deletions
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4
glslang/HLSL/hlslParseHelper.cpp
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@ -5430,7 +5430,7 @@ void HlslParseContext::decomposeIntrinsic(const TSourceLoc& loc, TIntermTyped*&
}
case EOpWavePrefixCountBits:
{
// Mapped to subgroupBallotInclusiveBitCount(subgroupBallot())
// Mapped to subgroupBallotExclusiveBitCount(subgroupBallot())
// builtin
// uvec4 type.
@ -5444,7 +5444,7 @@ void HlslParseContext::decomposeIntrinsic(const TSourceLoc& loc, TIntermTyped*&
TType uintType(EbtUint, EvqTemporary);
node = intermediate.addBuiltInFunctionCall(loc,
EOpSubgroupBallotInclusiveBitCount, true, res, uintType);
EOpSubgroupBallotExclusiveBitCount, true, res, uintType);
break;
}