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[ShaderCompiler] Fix VReadlane scalar destination field (#344)

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V_READLANE uses the gfx10 VOP3A vdst byte even though its result is scalar. Decode bits 0-7 and cover the public LLVM s5 and s101 encodings so the VOP3B sdst field cannot be confused with this opcode again.
This commit is contained in:
Peter Bonanni
2026-07-17 19:41:07 -04:00
committed by GitHub
parent ecbb0db9be
commit bcb0ebd991
2 changed files with 55 additions and 2 deletions
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src/SharpEmu.ShaderCompiler/Gen5ShaderTranslator.cs
+3 -2
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@@ -1872,8 +1872,9 @@ public static class Gen5ShaderTranslator
destinations = [Gen5Operand.Vector(word & 0xFF)];
if (opcode == "VReadlaneB32")
{
// The scalar destination lives in the low vdst byte (bits 0-7);
// bits 8-14 are the VOP3B carry-out sdst, which readlane lacks.
// V_READLANE uses the VOP3A vdst byte even though the
// destination register is scalar. Bits 8-14 are the
// distinct sdst field used by VOP3B encodings.
destinations = [Gen5Operand.Scalar(word & 0xFF)];
}
var isVop3B = IsVop3BOpcode((word >> 16) & 0x3FF);