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.
100 lines
2.3 KiB
LLVM
100 lines
2.3 KiB
LLVM
; RUN: llc -filetype=asm -mtriple=mipsel-none-nacl -relocation-model=static \
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; RUN: -O3 < %s | FileCheck %s
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; This test tests that NaCl functions are bundle-aligned.
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define void @test0() {
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ret void
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; CHECK: .p2align 4
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; CHECK-NOT: .p2align
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; CHECK-LABEL: test0:
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}
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; This test tests that blocks that are jumped to through jump table are
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; bundle-aligned.
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define i32 @test1(i32 %i) {
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entry:
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switch i32 %i, label %default [
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i32 0, label %bb1
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i32 1, label %bb2
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i32 2, label %bb3
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i32 3, label %bb4
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]
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bb1:
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ret i32 111
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bb2:
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ret i32 222
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bb3:
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ret i32 333
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bb4:
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ret i32 444
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default:
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ret i32 555
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; CHECK-LABEL: test1:
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; CHECK: .p2align 4
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 111
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 333
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 444
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 222
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 555
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}
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; This test tests that a block whose address is taken is bundle-aligned in NaCl.
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@bb_array = constant [2 x ptr] [ptr blockaddress(@test2, %bb1),
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ptr blockaddress(@test2, %bb2)], align 4
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define i32 @test2(i32 %i) {
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entry:
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%elementptr = getelementptr inbounds [2 x ptr], ptr @bb_array, i32 0, i32 %i
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%0 = load ptr, ptr %elementptr, align 4
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indirectbr ptr %0, [label %bb1, label %bb2]
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bb1:
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ret i32 111
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bb2:
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ret i32 222
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; CHECK-LABEL: test2:
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; Note that there are two consecutive labels - one temporary and one for
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; basic block.
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; CHECK: .p2align 4
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; CHECK-NEXT: ${{[a-zA-Z0-9]+}}:
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 111
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: ${{[a-zA-Z0-9]+}}:
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; CHECK-NEXT: ${{BB[0-9]+_[0-9]+}}:
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; CHECK-NEXT: jr $ra
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; CHECK-NEXT: addiu $2, $zero, 222
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}
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