Index hero/code601
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Matt Mascarenhas
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[video output=day601 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Sketching Out the Walk Table Generator" vod_platform=youtube id=01utCzOSruc annotator=Miblo]
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[0:01][Recap and set the stage for the day improving our :lighting :performance][:speech]
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[3:13][Reflect on yesterday's work on GridRayCast()][:lighting :research]
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[5:01][Determine to generate the WalkTable][:lighting :research]
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[5:50][Set up GridRayCast() to index into the WalkTable][:lighting]
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[7:03][On striding through the voxel, and the need to bounds-check in multiple dimensions][:lighting :research]
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[10:02][Make RayCast() set a WalkCount for GridRayCast() to use when striding through the WalkTable, augmenting light_sample_direction with an EndAtWalkOffset][:"data structure" :lighting]
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[12:28][Micro- and Macro-op Fusion[ref
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site="Compiler Explorer"
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url=https://godbolt.org]][:asm :performance :research]
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[19:15][Looping in clang -O2[ref
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site="Compiler Explorer"
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url=https://godbolt.org]][:asm :performance :research]
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[20:33][clang's loop unrolling[ref
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site="Compiler Explorer"
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url=https://godbolt.org]][:asm :performance :research]
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[24:54][Looping in msvc -O2[ref
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site="Compiler Explorer"
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url=https://godbolt.org]][:asm :performance :research]
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[27:04][Looping in clang -O3, with its micro-architectural analysis[ref
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site="Compiler Explorer"
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url=https://godbolt.org]][:asm :performance :research]
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[28:24][Micro- and Macro-op Fusion[ref
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site="Compiler Explorer"
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url=https://godbolt.org]][:asm :performance :research]
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[30:34][Micro- and Macro-op Fusion of non-deterministic looping[ref
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site="Compiler Explorer"
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url=https://godbolt.org][ref
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site=uops.info
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url=https://uops.info/table.html]][:asm :performance :research]
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[37:45][Non-deterministic looping in clang -O3, with its micro-architectural analysis[ref
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site="Compiler Explorer"
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url=https://godbolt.org][ref
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site="LLVM 10 Documentation"
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page="llvm-mca - LLVM Machine Code Analyzer"
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url=https://www.llvm.org/docs/CommandGuide/llvm-mca.html]][:asm :performance :research]
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[44:49][Make GridRayCast() loop through the WalkTable, renaming the indices in light_sample_direction][:"data structure" :lighting]
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[50:03][Consider how to generate the WalkCount][:lighting :research]
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[52:20][Walk Table Truncation][:blackboard :lighting]
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[55:10][Replace the WalkCount with a SPATIAL_GRID_NODE_TERMINATOR skirt surrounding the spatial grid][:"data structure" :lighting]
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[57:20][Prepare RayCast(), GridRayCast(), FullCast() and ComputeLightPropagationWork() to develop the WalkTable generation and compare the current and resulting routines, introducing GridIndexFrom()][:"data structure" :lighting]
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[1:23:18][WalkTable generation, à la Bresenham Line Drawing][:blackboard :geometry :lighting]
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[1:28:05][Introduce ComputeWalkTable()][:geometry :lighting]
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[1:39:51][Q&A][:speech]
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[1:40:14][@naysayer88][Q: https://imgur.com/a/A28qRIw[ref
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site=imgur
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page=A28qRIw
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url=https://imgur.com/a/A28qRIw]]
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[1:41:15][@thetamiel][Billy Mitchell has recently sued some people for slandering him]
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[1:42:31][@sneakybob_wot][Did they say he used an emulator rather than a real arcade?]
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[1:43:15][@mindmark42][Q: Can you explain more what a micro-op is?][:isa]
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[1:43:32][Skylake-ish Core Micro-op (µop)][:asm :blackboard :hardware :isa]
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[1:58:29][Micro-op Fusion and Limits][:asm :blackboard :hardware :isa]
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[2:01:39][Macro-op Fusion][:asm :blackboard :hardware :isa]
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[2:07:02][@somebody_took_my_name][Q: I don't think they fuse the instructions anymore. Take a look at LOOP, LOOPE and LOOPNE on uops.info.[ref
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site=uops.info
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url=https://uops.info/table.html] They take a lot of uops. (No expert here, but pure from poking Godbolt and the x86_64 instruction set / byte codes[ref
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site="x86asm.net"
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page="coder64 edition | X86 Opcode and Instruction Reference 1.12"
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url=http://ref.x86asm.net/coder64.html])][:asm :hardware :isa]
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[2:07:37][@somebody_took_my_name][Q: Never mind, I thought you meant that the compiler fused the instructions, not the uops in the pipe][:asm :hardware :isa]
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[2:07:48][@naysayer88][Q: What if it is an HTML DIV in the scheduler?]
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[2:07:53][WebAssembly][:asm :blackboard]
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[2:08:23][@printf_armin][They do even crazier instruction squashing now][:asm :hardware :isa]
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[2:10:14][We're all good here][:speech]
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[2:11:04][@naysayer88][Probably not!]
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[2:11:28][@naysayer88][I should have OBS'd it]
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[2:11:47][@somebody_took_my_name][Does he have a save game? Or are there no save games?]
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[2:12:01][@naysayer88][Look, if my screenshot[ref
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site=imgur
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page=A28qRIw
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url=https://imgur.com/a/A28qRIw] is invalid, then YOURS is invalid, and my score being higher, my invalid screenshot is better than yours]
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[2:12:16][That's it, everybody][:speech]
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[/video]
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