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This patch adds more instructions to the Uniforms list, for example certain intrinsics that are uniform by definition or whose operands are loop invariant. This list includes: 1. The intrinsics 'experimental.noalias.scope.decl' and 'sideeffect', which are always uniform by definition. 2. If intrinsics 'lifetime.start', 'lifetime.end' and 'assume' have loop invariant input operands then these are also uniform too. Also, in VPRecipeBuilder::handleReplication we check if an instruction is uniform based purely on whether or not the instruction lives in the Uniforms list. However, there are certain cases where calls to some intrinsics can be effectively treated as uniform too. Therefore, we now also treat the following cases as uniform for scalable vectors: 1. If the 'assume' intrinsic's operand is not loop invariant, then we are free to treat this as uniform anyway since it's only a performance hint. We will get the benefit for the first lane. 2. When the input pointers for 'lifetime.start' and 'lifetime.end' are loop variant then for scalable vectors we assume these still ultimately come from the broadcast of an alloca. We do not support scalable vectorisation of loops containing alloca instructions, hence the alloca itself would be invariant. If the pointer does not come from an alloca then the intrinsic itself has no effect. I have updated the assume test for fixed width, since we now treat it as uniform: Transforms/LoopVectorize/assume.ll I've also added new scalable vectorisation tests for other intriniscs: Transforms/LoopVectorize/scalable-assume.ll Transforms/LoopVectorize/scalable-lifetime.ll Transforms/LoopVectorize/scalable-noalias-scope-decl.ll Differential Revision: https://reviews.llvm.org/D107284 (cherry picked from commit 3fd96e1b2e129b981f1bc1be2615486187e74687) |
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