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AMDGPU/SI: Don't mark VINTRP instructions as mayLoad
Summary: These instructions technically do read from memory, but the memory is considered to be out of bounds for normal load/store instructions. shader-db stats: SGPRS: 1416075 -> 1413323 (-0.19 %) VGPRS: 867413 -> 863935 (-0.40 %) Spilled SGPRs: 1409 -> 1354 (-3.90 %) Spilled VGPRs: 63 -> 63 (0.00 %) Private memory VGPRs: 880 -> 880 (0.00 %) Scratch size: 2648 -> 2632 (-0.60 %) dwords per thread Code Size: 37889052 -> 37897340 (0.02 %) bytes LDS: 2147 -> 2147 (0.00 %) blocks Max Waves: 279243 -> 280369 (0.40 %) Wait states: 0 -> 0 (0.00 %) Reviewers: nhaehnle, mareko, arsenm Subscribers: kzhuravl, wdng, yaxunl, tony-tye Differential Revision: https://reviews.llvm.org/D27593 llvm-svn: 289219
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