From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Wed, 9 Dec 2015 02:01:15 +0000 (-0500)
Subject: nv50/ir: fix cutoff for using r63 vs r127 when replacing zero
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f920f8eb026d39c0adb547a90399e76b8351fec6;p=mesa.git

nv50/ir: fix cutoff for using r63 vs r127 when replacing zero

The only effect here is a space savings - 822 programs in shader-db
affected with the following overall change:

total bytes used in shared programs   : 44154976 -> 44139880 (-0.03%)

Fixes: 641eda0c (nv50/ir: r63 is only 0 if we are using less than 63 registers)
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: "11.0 11.1" <mesa-stable@lists.freedesktop.org>
---

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
index df44a7be7b7..64f5fc0031e 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nv50.cpp
@@ -202,7 +202,8 @@ NV50LegalizePostRA::visit(Function *fn)
    Program *prog = fn->getProgram();
 
    r63 = new_LValue(fn, FILE_GPR);
-   if (prog->maxGPR < 63)
+   // GPR units on nv50 are in half-regs
+   if (prog->maxGPR < 126)
       r63->reg.data.id = 63;
    else
       r63->reg.data.id = 127;