derek.holloway
7502bf64a4
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75 lines
1.7 KiB
LLVM
75 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc < %s -mtriple=aarch64 | FileCheck %s
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; When consuming profile data we sometimes flip a branch to improve runtime
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; performance. If we are optimizing for size, we avoid changing the branch to
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; improve outlining and ICF.
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define i8 @foo_optsize(i32 %v4) optsize {
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; CHECK-LABEL: foo_optsize:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: cbnz w0, .LBB0_2
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; CHECK-NEXT: // %bb.1: // %b2
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; CHECK-NEXT: mov w0, #1 // =0x1
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB0_2: // %b1
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; CHECK-NEXT: cmp w0, #1
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; CHECK-NEXT: mov w0, wzr
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; CHECK-NEXT: ret
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entry:
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%v2 = icmp eq i32 0, 0
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br i1 %v2, label %b1, label %b4
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b1:
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switch i32 %v4, label %b4 [
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i32 1, label %b3
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i32 0, label %b2
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], !prof !0
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b2:
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br label %b4
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b3:
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%v3 = icmp eq i32 0, 0
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br i1 %v3, label %b4, label %b2
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b4:
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%v16 = phi i8 [ 1, %b2 ], [ 0, %entry ], [ 0, %b3 ], [ 0, %b1 ]
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ret i8 %v16
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}
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define i8 @foo_optspeed(i32 %v4) {
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; CHECK-LABEL: foo_optspeed:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: cbnz w0, .LBB1_2
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; CHECK-NEXT: // %bb.1: // %b2
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; CHECK-NEXT: mov w0, #1 // =0x1
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB1_2: // %b1
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; CHECK-NEXT: cmp w0, #1
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; CHECK-NEXT: mov w0, wzr
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; CHECK-NEXT: ret
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entry:
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%v2 = icmp eq i32 0, 0
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br i1 %v2, label %b1, label %b4
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b1:
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switch i32 %v4, label %b4 [
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i32 1, label %b3
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i32 0, label %b2
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], !prof !0
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b2:
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br label %b4
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b3:
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%v3 = icmp eq i32 0, 0
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br i1 %v3, label %b4, label %b2
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b4:
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%v16 = phi i8 [ 1, %b2 ], [ 0, %entry ], [ 0, %b3 ], [ 0, %b1 ]
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ret i8 %v16
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}
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!0 = !{!"branch_weights", i32 5, i32 5, i32 100}
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