[Bug 102382] New: nv50ir: isImmediate doesn't properly work for integers if Value is typed as float - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 102382] New: nv50ir: isImmediate doesn't properly work for integers if Value is typed as float
Date: Wed, 23 Aug 2017 21:18:46 +0000	[thread overview]
Message-ID: <bug-102382-8800@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=102382

            Bug ID: 102382
           Summary: nv50ir: isImmediate doesn't properly work for integers
                    if Value is typed as float
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: karolherbst-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 133728
  --> https://bugs.freedesktop.org/attachment.cgi?id=133728&action=edit
TGSI

codegen should generate a texfetch instruction with a lod according to
IMM[1].xxxx, which is of value 2, but in
https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp#n140
the isInteger(0) call assumes the Value being a F32, which leads to a is
2.8E-45 == 0 check returning true resulting into the lod argument being removed
from texfetch.

This causes a fail in the KHR-GL44.robust_buffer_access_behavior.texel_fetch
CTS test.

Other isInteger calls might be broken as well where an immediate of type float
is interpreted as int by the instruction.

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