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intel/elk: Use pixel_z for gl_FragCoord.z on pre-gen6.

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Unless I've seriously missed something, we have the Z in the payload
(which we can always request if we need access to it and it's not already
passed to us due other WM IZ settings).

total instructions in shared programs: 4408303 -> 4408186 (<.01%)
instructions in affected programs: 1164 -> 1047 (-10.05%)
total cycles in shared programs: 142485036 -> 142484566 (<.01%)
cycles in affected programs: 26820 -> 26350 (-1.75%)

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25190>
This commit is contained in:
Emma Anholt 2025-02-21 10:49:58 -08:00 • committed by Marge Bot
parent dc55b47a58
commit 269fbcb144
1 changed files with 1 additions and 7 deletions
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8
src/intel/compiler/elk/elk_fs_nir.cpp
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@ -3920,13 +3920,7 @@ fs_nir_emit_fs_intrinsic(nir_to_elk_state &ntb,
break;
case nir_intrinsic_load_frag_coord_z:
if (devinfo->ver >= 6) {
bld.MOV(dest, s.pixel_z);
} else {
bld.emit(ELK_FS_OPCODE_LINTERP, dest,
s.delta_xy[ELK_BARYCENTRIC_PERSPECTIVE_PIXEL],
s.interp_reg(bld, VARYING_SLOT_POS, 2, 0));
}
bld.MOV(dest, s.pixel_z);
break;
case nir_intrinsic_load_frag_coord_w: