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glsl: Store ir_variable::depth_layout using 3 bits
warn_extension_index was moved to improve packing.
Valgrind massif results for a trimmed apitrace of dota2:
n time(i) total(B) useful-heap(B) extra-heap(B) stacks(B)
Before (32-bit): 73 40,580,476,304 68,488,400 62,796,151 5,692,249 0
After (32-bit): 73 40,575,751,558 68,116,528 62,618,607 5,497,921 0
Before (64-bit): 71 37,124,890,613 95,889,584 88,089,008 7,800,576 0
After (64-bit): 62 37,123,578,526 95,150,784 87,711,304 7,439,480 0
A real savings of 173KiB on 32-bit and 368KiB on 64-bit.
v2: Use the enum name with the bit-field and remove the extra casts.
Suggested by Ken.
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com> [v1]
Reviewed-by: Tapani Pälli <tapani.palli@intel.com> [v1]