Comments (3)
mknejp
commented on May 23, 2024
There are really two models that SPIR-V supports. The one chosen by glslang seems to be a load/store model without OpPhi. The alternative is to use only OpPhi and do without loads/stores where possible. Both are equally valid (if side effects are handled properly) and one can transform the former into the latter.
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sylware
commented on May 23, 2024
Then why keeping phi? Is phi that efficient at removing excessive load/store?
(Because phi is kind of complex to implement on SIMD machines)
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sylware
commented on May 23, 2024
It seems since spirv is based on ssa, but not formal ssa,
phi may be more an extra implementation burden than anything else.
There is a bug an khronos bugzilla for the spirv product.
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Related Issues (20)
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- Incorrect SPIR-V generated when using a fixed-size array of sampler2D with -R (relaxed vulkan rules) HOT 3
- Compile warning on VS2022
- error in combination with preprocessor directives can obfuscate error location. HOT 4
- Glslang version output? HOT 1
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- Implement GL_NV_bindless_texture HOT 6
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- When will this be fixed? I have already sent PR HOT 2
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- Crash on WebASM HOT 6
- error report when use GL_OES_EGL_image_external_essl3 HOT 2
- ABI break in glslang-14.2 HOT 1
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- Location aliasing should allow mismatch in auxiliary qualifier HOT 1
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