e3cf80c5c1
BlockFrequencyInfo calculates block frequencies as Scaled64 numbers but as a last step converts them to unsigned 64bit integers (`BlockFrequency`). This improves the factors picked for this conversion so that: * Avoid big numbers close to UINT64_MAX to avoid users overflowing/saturating when adding multiply frequencies together or when multiplying with integers. This leaves the topmost 10 bits unused to allow for some room. * Spread the difference between hottest/coldest block as much as possible to increase precision. * If the hot/cold spread cannot be represented loose precision at the lower end, but keep the frequencies at the upper end for hot blocks differentiable.
48 lines
2.0 KiB
LLVM
48 lines
2.0 KiB
LLVM
; RUN: not --crash opt -passes='consthoist' -S -o - -consthoist-gep=1 -mtriple=x86_64-unknown-linux-gnu < %s 2>&1 | FileCheck %s
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; REQUIRES: asserts
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; My changes fixed this likely by accident, please update as necessary when
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; you work on this:
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; XFAIL: *
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; Matching assertion strings is not easy as they might differ on different
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; platforms. So limit this to x86_64-linux.
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; REQUIRES: x86_64-linux
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; This is a reproducer for https://github.com/llvm/llvm-project/issues/52689
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;
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; opt: ../lib/Transforms/Scalar/ConstantHoisting.cpp:919: bool llvm::ConstantHoistingPass::emitBaseConstants(llvm::GlobalVariable *): Assertion `UsesNum == (ReBasesNum + NotRebasedNum) && "Not all uses are rebased"' failed.
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; CHECK: UsesNum == (ReBasesNum + NotRebasedNum)
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; CHECK-SAME: Not all uses are rebased
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@g_77 = external global [5 x i32]
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define internal ptr @func_29(i1 %p1, i1 %p2, ptr %p3) {
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entry:
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br i1 %p1, label %crit_edge, label %if.else3089
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crit_edge: ; preds = %entry
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br label %for.cond1063
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for.cond1063: ; preds = %cleanup1660, %crit_edge
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%l_323.sroa.0.0 = phi ptr [ getelementptr inbounds ([5 x i32], ptr @g_77, i32 0, i32 3), %cleanup1660 ], [ null, %crit_edge ]
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%l_323.sroa.2.0 = phi ptr [ getelementptr inbounds ([5 x i32], ptr @g_77, i32 0, i32 3), %cleanup1660 ], [ null, %crit_edge ]
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br i1 %p2, label %cleanup1660.thread, label %cleanup1674
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cleanup1660.thread: ; preds = %for.cond1063
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br label %cleanup1674
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cleanup1660: ; No predecessors!
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br label %for.cond1063
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cleanup1674: ; preds = %cleanup1660.thread, %for.cond1063
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store ptr getelementptr inbounds ([5 x i32], ptr @g_77, i32 0, i32 1), ptr %p3, align 1
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ret ptr null
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if.else3089: ; preds = %entry
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store ptr getelementptr inbounds ([5 x i32], ptr @g_77, i32 0, i32 1), ptr %p3, align 1
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ret ptr null
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}
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