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.
52 lines
1.8 KiB
LLVM
52 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
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; RUN: llc < %s -mtriple=ve | FileCheck %s
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; Function Attrs: norecurse nounwind readnone
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define signext i32 @brind(i32 signext %0) {
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; CHECK-LABEL: brind:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpu.w %s1, %s0, (63)0
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; CHECK-NEXT: lea %s2, .Ltmp0@lo
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; CHECK-NEXT: and %s2, %s2, (32)0
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; CHECK-NEXT: lea.sl %s2, .Ltmp0@hi(, %s2)
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; CHECK-NEXT: lea %s3, .Ltmp1@lo
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; CHECK-NEXT: and %s3, %s3, (32)0
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; CHECK-NEXT: lea.sl %s3, .Ltmp1@hi(, %s3)
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; CHECK-NEXT: cmov.w.eq %s2, %s3, %s1
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; CHECK-NEXT: lea %s1, .Ltmp2@lo
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; CHECK-NEXT: and %s1, %s1, (32)0
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; CHECK-NEXT: lea.sl %s1, .Ltmp2@hi(, %s1)
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; CHECK-NEXT: cmov.w.eq %s1, %s2, %s0
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; CHECK-NEXT: b.l.t (, %s1)
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; CHECK-NEXT: .Ltmp0: # Block address taken
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; CHECK-NEXT: .LBB0_3:
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; CHECK-NEXT: or %s0, -1, (0)1
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; CHECK-NEXT: adds.w.sx %s0, %s0, (0)1
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; CHECK-NEXT: b.l.t (, %s10)
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; CHECK-NEXT: .Ltmp2: # Block address taken
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; CHECK-NEXT: .LBB0_2:
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; CHECK-NEXT: or %s0, 2, (0)1
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; CHECK-NEXT: adds.w.sx %s0, %s0, (0)1
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; CHECK-NEXT: b.l.t (, %s10)
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; CHECK-NEXT: .Ltmp1: # Block address taken
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; CHECK-NEXT: .LBB0_1:
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; CHECK-NEXT: or %s0, 1, (0)1
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; CHECK-NEXT: adds.w.sx %s0, %s0, (0)1
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; CHECK-NEXT: b.l.t (, %s10)
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%2 = icmp eq i32 %0, 1
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%3 = select i1 %2, ptr blockaddress(@brind, %6), ptr blockaddress(@brind, %8)
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%4 = icmp eq i32 %0, 0
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%5 = select i1 %4, ptr %3, ptr blockaddress(@brind, %7)
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indirectbr ptr %5, [label %8, label %6, label %7]
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6: ; preds = %1
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br label %8
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7: ; preds = %1
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br label %8
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8: ; preds = %1, %7, %6
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%9 = phi i32 [ 2, %7 ], [ 1, %6 ], [ -1, %1 ]
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ret i32 %9
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}
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