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.
91 lines
3.4 KiB
LLVM
91 lines
3.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -filetype=obj -o /dev/null < %s
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; RUN: llc -filetype=asm %s -o - | FileCheck %s
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; ModuleID = 'bugpoint-reduced-simplified.bc'
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source_filename = "bugpoint-output-39ed676.bc"
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv8m.base-arm-none-eabi"
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@crc32_tab = external unnamed_addr global [256 x i32], align 4
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@g_566 = external global ptr, align 4
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define void @main() {
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; CHECK-LABEL: main:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: movw r0, :lower16:g_566
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; CHECK-NEXT: movt r0, :upper16:g_566
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; CHECK-NEXT: ldr r0, [r0]
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: cmp r0, #0
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; CHECK-NEXT: beq .LBB0_7
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; CHECK-NEXT: @ %bb.1: @ %for.cond7.preheader.i.lr.ph.i.i
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; CHECK-NEXT: bne .LBB0_7
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; CHECK-NEXT: .LBB0_2: @ %for.cond14.preheader.us.i.i.i
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: cbnz r0, .LBB0_6
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; CHECK-NEXT: @ %bb.3: @ %for.cond14.preheader.us.i.i.i
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; CHECK-NEXT: @ in Loop: Header=BB0_2 Depth=1
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; CHECK-NEXT: lsls r1, r0, #2
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; CHECK-NEXT: adr r2, .LJTI0_0
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; CHECK-NEXT: adds r1, r2, r1
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; CHECK-NEXT: mov pc, r1
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; CHECK-NEXT: @ %bb.4:
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; CHECK-NEXT: .p2align 2
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; CHECK-NEXT: .LJTI0_0:
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; CHECK-NEXT: b.w .LBB0_5
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_8
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; CHECK-NEXT: b.w .LBB0_7
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_6
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; CHECK-NEXT: b.w .LBB0_5
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; CHECK-NEXT: .LBB0_5: @ %for.cond14.preheader.us.i.i.i
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; CHECK-NEXT: @ in Loop: Header=BB0_2 Depth=1
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; CHECK-NEXT: b .LBB0_2
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; CHECK-NEXT: .LBB0_6: @ %func_1.exit.loopexit
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; CHECK-NEXT: .LBB0_7: @ %for.end476.i.i.i.loopexit
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; CHECK-NEXT: .LBB0_8: @ %lbl_1394.i.i.i.loopexit
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entry:
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%0 = load volatile ptr, ptr @g_566, align 4
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br label %func_16.exit.i.i.i
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lbl_1394.i.i.i.loopexit: ; preds = %for.cond14.preheader.us.i.i.i
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unreachable
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func_16.exit.i.i.i: ; preds = %entry
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br i1 undef, label %for.cond7.preheader.i.lr.ph.i.i, label %for.end476.i.i.i.loopexit
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for.cond7.preheader.i.lr.ph.i.i: ; preds = %func_16.exit.i.i.i
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br i1 undef, label %for.end476.i.i.i.loopexit, label %for.cond7.preheader.i.i.preheader.i
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for.cond7.preheader.i.i.preheader.i: ; preds = %for.cond7.preheader.i.lr.ph.i.i
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br label %for.cond14.preheader.us.i.i.i
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for.cond7.preheader.i.us.i.i: ; preds = %for.cond7.preheader.i.lr.ph.i.i
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unreachable
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for.cond14.preheader.us.i.i.i: ; preds = %for.inc459.us.i.i.i, %for.cond7.preheader.i.i.preheader.i
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switch i4 undef, label %func_1.exit.loopexit [
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i4 0, label %for.inc459.us.i.i.i
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i4 -5, label %for.inc459.us.i.i.i
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i4 2, label %lbl_1394.i.i.i.loopexit
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i4 3, label %for.end476.i.i.i.loopexit
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]
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for.inc459.us.i.i.i: ; preds = %for.cond14.preheader.us.i.i.i, %for.cond14.preheader.us.i.i.i
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br label %for.cond14.preheader.us.i.i.i
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for.end476.i.i.i.loopexit: ; preds = %for.cond14.preheader.us.i.i.i
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unreachable
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func_1.exit.loopexit: ; preds = %for.cond14.preheader.us.i.i.i
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%arrayidx.i63.i.i5252 = getelementptr inbounds [256 x i32], ptr @crc32_tab, i32 0, i32 undef
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unreachable
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}
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