77 lines
2.3 KiB
LLVM
77 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc --mtriple=loongarch64 < %s | FileCheck %s
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;; This test checks that LLVM can do basic stripping and reapplying of branches
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;; to basic blocks.
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declare void @test_true()
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declare void @test_false()
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;; !0 corresponds to a branch being taken, !1 to not being taken.
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!0 = !{!"branch_weights", i32 64, i32 4}
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!1 = !{!"branch_weights", i32 4, i32 64}
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define void @test_bcc_fallthrough_taken(i64 %in) nounwind {
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; CHECK-LABEL: test_bcc_fallthrough_taken:
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; CHECK: # %bb.0:
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; CHECK-NEXT: addi.d $sp, $sp, -16
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; CHECK-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
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; CHECK-NEXT: ori $a1, $zero, 42
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; CHECK-NEXT: bne $a0, $a1, .LBB0_3
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; CHECK-NEXT: # %bb.1: # %true
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; CHECK-NEXT: bl %plt(test_true)
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; CHECK-NEXT: .LBB0_2: # %true
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; CHECK-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
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; CHECK-NEXT: addi.d $sp, $sp, 16
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB0_3: # %false
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; CHECK-NEXT: bl %plt(test_false)
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; CHECK-NEXT: b .LBB0_2
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%tst = icmp eq i64 %in, 42
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br i1 %tst, label %true, label %false, !prof !0
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;; Expected layout order is: Entry, TrueBlock, FalseBlock
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;; Entry->TrueBlock is the common path, which should be taken whenever the
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;; conditional branch is false.
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true:
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call void @test_true()
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ret void
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false:
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call void @test_false()
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ret void
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}
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define void @test_bcc_fallthrough_nottaken(i64 %in) nounwind {
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; CHECK-LABEL: test_bcc_fallthrough_nottaken:
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; CHECK: # %bb.0:
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; CHECK-NEXT: addi.d $sp, $sp, -16
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; CHECK-NEXT: st.d $ra, $sp, 8 # 8-byte Folded Spill
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; CHECK-NEXT: ori $a1, $zero, 42
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; CHECK-NEXT: beq $a0, $a1, .LBB1_3
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; CHECK-NEXT: # %bb.1: # %false
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; CHECK-NEXT: bl %plt(test_false)
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; CHECK-NEXT: .LBB1_2: # %true
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; CHECK-NEXT: ld.d $ra, $sp, 8 # 8-byte Folded Reload
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; CHECK-NEXT: addi.d $sp, $sp, 16
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB1_3: # %true
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; CHECK-NEXT: bl %plt(test_true)
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; CHECK-NEXT: b .LBB1_2
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%tst = icmp eq i64 %in, 42
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br i1 %tst, label %true, label %false, !prof !1
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;; Expected layout order is: Entry, FalseBlock, TrueBlock
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;; Entry->FalseBlock is the common path, which should be taken whenever the
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;; conditional branch is false.
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true:
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call void @test_true()
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ret void
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false:
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call void @test_false()
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ret void
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}
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