8a3d7c9cbd
Quite a while ago, we implemented a pass that will reduce the number of CR-logical operations we emit. It does so by converting a CR-logical operation into a branch. We have kept this off by default because it seemed to cause a significant regression with one benchmark. However, that regression turned out to be due to a completely unrelated reason - AADB introducing a self-copy that is a priority-setting nop and it was just exacerbated by this pass. Now that we understand the reason for the only degradation, we can turn this pass on by default. We have long since fixed the cause for the degradation. Differential revision: https://reviews.llvm.org/D52431 llvm-svn: 375152
56 lines
1.6 KiB
LLVM
56 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr9 < %s | FileCheck %s
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define void @f(i8*, i8*, i64*) {
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; Check we don't assert and this is not a Hardware Loop
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; CHECK-LABEL: f:
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; CHECK: # %bb.0:
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; CHECK-NEXT: cmpld 3, 4
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; CHECK-NEXT: beqlr 0
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; CHECK-NEXT: # %bb.1:
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; CHECK-NEXT: ld 6, 8(5)
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; CHECK-NEXT: not 3, 3
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; CHECK-NEXT: add 3, 3, 4
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; CHECK-NEXT: li 4, 0
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; CHECK-NEXT: .p2align 5
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; CHECK-NEXT: .LBB0_2: #
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; CHECK-NEXT: sldi 6, 6, 4
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; CHECK-NEXT: cmplwi 4, 14
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; CHECK-NEXT: addi 7, 4, 1
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; CHECK-NEXT: bc 12, 1, .LBB0_4
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; CHECK-NEXT: # %bb.3: #
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; CHECK-NEXT: cmpd 3, 4
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; CHECK-NEXT: mr 4, 7
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; CHECK-NEXT: bc 4, 2, .LBB0_2
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; CHECK-NEXT: .LBB0_4:
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; CHECK-NEXT: std 6, 8(5)
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; CHECK-NEXT: blr
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%4 = icmp eq i8* %0, %1
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br i1 %4, label %9, label %5
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5: ; preds = %3
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%6 = getelementptr inbounds i64, i64* %2, i64 1
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%7 = load i64, i64* %6, align 8
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br label %10
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8: ; preds = %10
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store i64 %14, i64* %6, align 8
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br label %9
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9: ; preds = %8, %3
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ret void
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10: ; preds = %5, %10
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%11 = phi i64 [ %7, %5 ], [ %14, %10 ]
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%12 = phi i32 [ 0, %5 ], [ %15, %10 ]
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%13 = phi i8* [ %0, %5 ], [ %16, %10 ]
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%14 = shl nsw i64 %11, 4
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%15 = add nuw nsw i32 %12, 1
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%16 = getelementptr inbounds i8, i8* %13, i64 1
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%17 = icmp ugt i32 %12, 14
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%18 = icmp eq i8* %16, %1
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%19 = or i1 %18, %17
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br i1 %19, label %8, label %10
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}
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