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nir: Add a nop intrinsic

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This intrinsic has no destination, no sources, no variables, and can be
eliminated.  In other words, it does nothing and will always get deleted by
dead code elimination.  However, it does provide a quick-and-easy way to
temporarily tag a particular location in a NIR shader.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: "12.0" <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Jason Ekstrand 2016-09-15 21:02:37 -07:00
parent 0176c6a692
commit 7697b4b98b
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_intrinsics.h
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@ -41,6 +41,9 @@
#define ARR(...) { __VA_ARGS__ }
INTRINSIC(nop, 0, ARR(0), false, 0, 0, 0, xx, xx, xx,
NIR_INTRINSIC_CAN_ELIMINATE)
INTRINSIC(load_var, 0, ARR(0), true, 0, 1, 0, xx, xx, xx, NIR_INTRINSIC_CAN_ELIMINATE)
INTRINSIC(store_var, 1, ARR(0), false, 0, 1, 1, WRMASK, xx, xx, 0)
INTRINSIC(copy_var, 0, ARR(0), false, 0, 2, 0, xx, xx, xx, 0)