From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 104143] r600/sb: clobbers gl_Position -> gl_FragCoord
Date: Wed, 06 Dec 2017 14:32:07 +0000
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Date: Wed, 6 Dec 2017 14:32:06 +0000
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https://bugs.freedesktop.org/show_bug.cgi?id=3D104143
--- Comment #8 from Gert Wollny ---
I found the problem:=20
if KC0[0].x =3D=3D index (=3D0):=20=20
1 x: ADD_INT T0.x, KC0[0].x, [0xfffffffe -nan].x
2 x: MOVA_INT __.x, T0.x
Address register is now -2 and hence, in the next step R1 is unconditional=
ly
written, and this is actually the gl_Vertex value ...
3 z: MOV R[3+AR].z, 0
w: MOV R[3+AR].w, [0x3dcccccd 0.1].x
that is here used to evaluate the gl_Posuition.=20
5 x: MUL_IEEE T0.x, KC0[1].w, R1.x
y: MUL_IEEE T0.y, KC0[1].z, R1.x
6 t: MULADD_IEEE T0.y, KC0[2].z, R1.y, T0.y SCL_212
...
In the un-optimized shader R[3+AR].w is only written to if (KC0[0].x >=3D 2=
), and
hence AR >=3D 0;
I.e. the sb optimizer is to aggressive in optimizing away the conditional
blocks.
--=20
You are receiving this mail because:
You are the assignee for the bug.=
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Date: Wed, 6 Dec 2017 14:32:06 +0000
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X-Bugzilla-URL: http://bugs.freedesktop.org/
Auto-Submitted: auto-generated
Commen=
t # 8
on bug 10414=
3
from Gert Wollny
I found the problem:=20
if KC0[0].x =3D=3D index (=3D0):=20=20
1 x: ADD_INT T0.x, KC0[0].x, [0xfffffffe -nan].x
2 x: MOVA_INT __.x, T0.x
Address register is now -2 and hence, in the next step R1 is unconditional=
ly
written, and this is actually the gl_Vertex value ...
3 z: MOV R[3+AR].z, 0
w: MOV R[3+AR].w, [0x3dcccccd 0.1].x
that is here used to evaluate the gl_Posuition.=20
5 x: MUL_IEEE T0.x, KC0[1].w, R1.x
y: MUL_IEEE T0.y, KC0[1].z, R1.x
6 t: MULADD_IEEE T0.y, KC0[2].z, R1.y, T0.y SCL_212
...
In the un-optimized shader R[3+AR].w is only written to if (KC0[0].x >=
=3D 2), and
hence AR >=3D 0;
I.e. the sb optimizer is to aggressive in optimizing away the conditional
blocks.
You are receiving this mail because:
- You are the assignee for the bug.
=
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