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https://github.com/RPCS3/llvm-mirror.git
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c3f51e8e54
uint32. When folding branches to common destination, the updated branch weights can exceed uint32 by more than factor of 2. We should keep halving the weights until they can fit into uint32. llvm-svn: 200262
393 lines
9.1 KiB
LLVM
393 lines
9.1 KiB
LLVM
; RUN: opt -simplifycfg -S -o - < %s | FileCheck %s
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declare void @helper(i32)
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define void @test1(i1 %a, i1 %b) {
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; CHECK-LABEL: @test1(
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entry:
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br i1 %a, label %Y, label %X, !prof !0
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !0
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X:
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%c = or i1 %b, false
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br i1 %c, label %Z, label %Y, !prof !1
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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define void @test2(i1 %a, i1 %b) {
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; CHECK-LABEL: @test2(
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entry:
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br i1 %a, label %X, label %Y, !prof !1
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !1
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; CHECK-NOT: !prof
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X:
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%c = or i1 %b, false
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br i1 %c, label %Z, label %Y, !prof !2
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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define void @test3(i1 %a, i1 %b) {
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; CHECK-LABEL: @test3(
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; CHECK-NOT: !prof
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entry:
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br i1 %a, label %X, label %Y, !prof !1
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X:
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%c = or i1 %b, false
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br i1 %c, label %Z, label %Y
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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define void @test4(i1 %a, i1 %b) {
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; CHECK-LABEL: @test4(
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; CHECK-NOT: !prof
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entry:
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br i1 %a, label %X, label %Y
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X:
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%c = or i1 %b, false
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br i1 %c, label %Z, label %Y, !prof !1
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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;; test5 - The case where it jumps to the default target will be removed.
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define void @test5(i32 %M, i32 %N) nounwind uwtable {
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entry:
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switch i32 %N, label %sw2 [
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i32 1, label %sw2
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i32 2, label %sw.bb
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i32 3, label %sw.bb1
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], !prof !3
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; CHECK-LABEL: @test5(
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; CHECK: switch i32 %N, label %sw2 [
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; CHECK: i32 3, label %sw.bb1
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; CHECK: i32 2, label %sw.bb
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; CHECK: ], !prof !2
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sw.bb:
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call void @helper(i32 0)
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br label %sw.epilog
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sw.bb1:
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call void @helper(i32 1)
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br label %sw.epilog
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sw2:
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call void @helper(i32 2)
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br label %sw.epilog
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sw.epilog:
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ret void
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}
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;; test6 - Some cases of the second switch are pruned during optimization.
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;; Then the second switch will be converted to a branch, finally, the first
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;; switch and the branch will be merged into a single switch.
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define void @test6(i32 %M, i32 %N) nounwind uwtable {
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entry:
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switch i32 %N, label %sw2 [
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i32 1, label %sw2
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i32 2, label %sw.bb
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i32 3, label %sw.bb1
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], !prof !4
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; CHECK-LABEL: @test6(
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; CHECK: switch i32 %N, label %sw.epilog
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; CHECK: i32 3, label %sw.bb1
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; CHECK: i32 2, label %sw.bb
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; CHECK: i32 4, label %sw.bb5
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; CHECK: ], !prof !3
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sw.bb:
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call void @helper(i32 0)
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br label %sw.epilog
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sw.bb1:
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call void @helper(i32 1)
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br label %sw.epilog
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sw2:
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;; Here "case 2" is invalidated since the default case of the first switch
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;; does not include "case 2".
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switch i32 %N, label %sw.epilog [
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i32 2, label %sw.bb4
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i32 4, label %sw.bb5
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], !prof !5
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sw.bb4:
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call void @helper(i32 2)
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br label %sw.epilog
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sw.bb5:
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call void @helper(i32 3)
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br label %sw.epilog
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sw.epilog:
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ret void
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}
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;; This test is based on test1 but swapped the targets of the second branch.
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define void @test1_swap(i1 %a, i1 %b) {
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; CHECK-LABEL: @test1_swap(
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entry:
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br i1 %a, label %Y, label %X, !prof !0
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; CHECK: br i1 %or.cond, label %Y, label %Z, !prof !4
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X:
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%c = or i1 %b, false
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br i1 %c, label %Y, label %Z, !prof !1
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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define void @test7(i1 %a, i1 %b) {
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; CHECK-LABEL: @test7(
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entry:
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%c = or i1 %b, false
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br i1 %a, label %Y, label %X, !prof !0
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; CHECK: br i1 %brmerge, label %Y, label %Z, !prof !5
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X:
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br i1 %c, label %Y, label %Z, !prof !6
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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; Test basic folding to a conditional branch.
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define void @test8(i64 %x, i64 %y) nounwind {
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; CHECK-LABEL: @test8(
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entry:
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%lt = icmp slt i64 %x, %y
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; CHECK: br i1 %lt, label %a, label %b, !prof !6
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%qux = select i1 %lt, i32 0, i32 2
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switch i32 %qux, label %bees [
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i32 0, label %a
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i32 1, label %b
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i32 2, label %b
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], !prof !7
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a:
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call void @helper(i32 0) nounwind
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ret void
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b:
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call void @helper(i32 1) nounwind
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ret void
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bees:
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call void @helper(i32 2) nounwind
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ret void
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}
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; Test edge splitting when the default target has icmp and unconditinal
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; branch
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define i1 @test9(i32 %x, i32 %y) nounwind {
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; CHECK-LABEL: @test9(
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entry:
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switch i32 %x, label %bees [
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i32 0, label %a
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i32 1, label %end
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i32 2, label %end
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], !prof !7
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; CHECK: switch i32 %x, label %bees [
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; CHECK: i32 0, label %a
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; CHECK: i32 1, label %end
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; CHECK: i32 2, label %end
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; CHECK: i32 92, label %end
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; CHECK: ], !prof !7
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a:
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call void @helper(i32 0) nounwind
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%reta = icmp slt i32 %x, %y
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ret i1 %reta
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bees:
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%tmp = icmp eq i32 %x, 92
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br label %end
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end:
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; CHECK: end:
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; CHECK: %ret = phi i1 [ true, %entry ], [ false, %bees ], [ true, %entry ], [ true, %entry ]
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%ret = phi i1 [ true, %entry ], [%tmp, %bees], [true, %entry]
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call void @helper(i32 2) nounwind
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ret i1 %ret
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}
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define void @test10(i32 %x) nounwind readnone ssp noredzone {
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entry:
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switch i32 %x, label %lor.rhs [
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i32 2, label %lor.end
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i32 1, label %lor.end
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i32 3, label %lor.end
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], !prof !7
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lor.rhs:
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call void @helper(i32 1) nounwind
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ret void
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lor.end:
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call void @helper(i32 0) nounwind
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ret void
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; CHECK-LABEL: @test10(
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; CHECK: %x.off = add i32 %x, -1
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; CHECK: %switch = icmp ult i32 %x.off, 3
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; CHECK: br i1 %switch, label %lor.end, label %lor.rhs, !prof !8
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}
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; Remove dead cases from the switch.
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define void @test11(i32 %x) nounwind {
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%i = shl i32 %x, 1
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switch i32 %i, label %a [
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i32 21, label %b
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i32 24, label %c
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], !prof !8
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; CHECK-LABEL: @test11(
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; CHECK: %cond = icmp eq i32 %i, 24
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; CHECK: br i1 %cond, label %c, label %a, !prof !9
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a:
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call void @helper(i32 0) nounwind
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ret void
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b:
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call void @helper(i32 1) nounwind
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ret void
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c:
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call void @helper(i32 2) nounwind
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ret void
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}
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;; test12 - Don't crash if the whole switch is removed
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define void @test12(i32 %M, i32 %N) nounwind uwtable {
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entry:
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switch i32 %N, label %sw.bb [
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i32 1, label %sw.bb
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], !prof !9
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @helper
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; CHECK-NEXT: ret void
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sw.bb:
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call void @helper(i32 0)
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br label %sw.epilog
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sw.epilog:
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ret void
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}
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;; If every case is dead, make sure they are all removed. This used to
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;; crash trying to merge the metadata.
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define void @test13(i32 %x) nounwind {
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entry:
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%i = shl i32 %x, 1
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switch i32 %i, label %a [
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i32 21, label %b
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i32 25, label %c
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], !prof !8
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @helper
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; CHECK-NEXT: ret void
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a:
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call void @helper(i32 0) nounwind
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ret void
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b:
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call void @helper(i32 1) nounwind
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ret void
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c:
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call void @helper(i32 2) nounwind
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ret void
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}
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;; When folding branches to common destination, the updated branch weights
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;; can exceed uint32 by more than factor of 2. We should keep halving the
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;; weights until they can fit into uint32.
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@max_regno = common global i32 0, align 4
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define void @test14(i32* %old, i32 %final) {
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; CHECK-LABEL: @test14
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; CHECK: br i1 %or.cond, label %for.exit, label %for.inc, !prof !10
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for.cond:
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br label %for.cond2
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for.cond2:
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%i.1 = phi i32 [ %inc19, %for.inc ], [ 0, %for.cond ]
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%bit.0 = phi i32 [ %shl, %for.inc ], [ 1, %for.cond ]
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%tobool = icmp eq i32 %bit.0, 0
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br i1 %tobool, label %for.exit, label %for.body3, !prof !10
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for.body3:
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%v3 = load i32* @max_regno, align 4
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%cmp4 = icmp eq i32 %i.1, %v3
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br i1 %cmp4, label %for.exit, label %for.inc, !prof !11
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for.inc:
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%shl = shl i32 %bit.0, 1
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%inc19 = add nsw i32 %i.1, 1
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br label %for.cond2
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for.exit:
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ret void
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}
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!0 = metadata !{metadata !"branch_weights", i32 3, i32 5}
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!1 = metadata !{metadata !"branch_weights", i32 1, i32 1}
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!2 = metadata !{metadata !"branch_weights", i32 1, i32 2}
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!3 = metadata !{metadata !"branch_weights", i32 4, i32 3, i32 2, i32 1}
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!4 = metadata !{metadata !"branch_weights", i32 4, i32 3, i32 2, i32 1}
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!5 = metadata !{metadata !"branch_weights", i32 7, i32 6, i32 5}
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!6 = metadata !{metadata !"branch_weights", i32 1, i32 3}
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!7 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8, i32 7}
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!8 = metadata !{metadata !"branch_weights", i32 33, i32 9, i32 8}
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!9 = metadata !{metadata !"branch_weights", i32 7, i32 6}
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!10 = metadata !{metadata !"branch_weights", i32 672646, i32 21604207}
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!11 = metadata !{metadata !"branch_weights", i32 6960, i32 21597248}
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; CHECK: !0 = metadata !{metadata !"branch_weights", i32 5, i32 11}
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; CHECK: !1 = metadata !{metadata !"branch_weights", i32 1, i32 5}
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; CHECK: !2 = metadata !{metadata !"branch_weights", i32 7, i32 1, i32 2}
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; CHECK: !3 = metadata !{metadata !"branch_weights", i32 49, i32 12, i32 24, i32 35}
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; CHECK: !4 = metadata !{metadata !"branch_weights", i32 11, i32 5}
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; CHECK: !5 = metadata !{metadata !"branch_weights", i32 17, i32 15}
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; CHECK: !6 = metadata !{metadata !"branch_weights", i32 9, i32 7}
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; CHECK: !7 = metadata !{metadata !"branch_weights", i32 17, i32 9, i32 8, i32 7, i32 17}
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; CHECK: !8 = metadata !{metadata !"branch_weights", i32 24, i32 33}
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; CHECK: !9 = metadata !{metadata !"branch_weights", i32 8, i32 33}
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;; The false weight prints out as a negative integer here, but inside llvm, we
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;; treat the weight as an unsigned integer.
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; CHECK: !10 = metadata !{metadata !"branch_weights", i32 112017436, i32 -735157296}
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