For values above integer accuracy in floats, val - floor(val) might
actually produce a value greater than 1. For such large floats, it's
reasonable to be imprecise, but it's unreasonable for FRC to return a
value that is not between 0 and 1.
Signed-off-by: Ilia Mirkin <imir...@alum.mit.edu>
---
src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
index 41b91e8..e5b767f 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
@@ -2512,7 +2512,8 @@ Converter::handleInstruction(const struct
tgsi_full_instruction *insn)
src0 = fetchSrc(0, c);
val0 = getScratch();
mkOp1(OP_FLOOR, TYPE_F32, val0, src0);
- mkOp2(OP_SUB, TYPE_F32, dst0[c], src0, val0);
+ mkOp2(OP_SUB, TYPE_F32, val0, src0, val0);
+ mkOp1(OP_SAT, TYPE_F32, dst0[c], val0);
}
break;
case TGSI_OPCODE_ROUND:
--
2.0.4
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