91 lines
2.6 KiB
LLVM
91 lines
2.6 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i386-unknown-unknown -jump-is-expensive=0 | FileCheck %s --check-prefix=JUMP2
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; RUN: llc < %s -mtriple=i386-unknown-unknown -jump-is-expensive=1 | FileCheck %s --check-prefix=JUMP1
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define void @foo(i32 %X, i32 %Y, i32 %Z) nounwind {
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; JUMP2-LABEL: foo:
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; JUMP2: # %bb.0: # %entry
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; JUMP2-NEXT: cmpl $5, {{[0-9]+}}(%esp)
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; JUMP2-NEXT: jl .LBB0_3
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; JUMP2-NEXT: # %bb.1: # %entry
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; JUMP2-NEXT: cmpl $0, {{[0-9]+}}(%esp)
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; JUMP2-NEXT: je .LBB0_3
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; JUMP2-NEXT: # %bb.2: # %UnifiedReturnBlock
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; JUMP2-NEXT: retl
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; JUMP2-NEXT: .LBB0_3: # %cond_true
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; JUMP2-NEXT: jmp bar@PLT # TAILCALL
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;
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; JUMP1-LABEL: foo:
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; JUMP1: # %bb.0: # %entry
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; JUMP1-NEXT: cmpl $0, {{[0-9]+}}(%esp)
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; JUMP1-NEXT: setne %al
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; JUMP1-NEXT: cmpl $4, {{[0-9]+}}(%esp)
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; JUMP1-NEXT: setg %cl
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; JUMP1-NEXT: testb %al, %cl
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; JUMP1-NEXT: jne .LBB0_1
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; JUMP1-NEXT: # %bb.2: # %cond_true
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; JUMP1-NEXT: jmp bar@PLT # TAILCALL
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; JUMP1-NEXT: .LBB0_1: # %UnifiedReturnBlock
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; JUMP1-NEXT: retl
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entry:
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%tmp1 = icmp eq i32 %X, 0
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%tmp3 = icmp slt i32 %Y, 5
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%tmp4 = or i1 %tmp3, %tmp1
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br i1 %tmp4, label %cond_true, label %UnifiedReturnBlock
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cond_true:
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%tmp5 = tail call i32 (...) @bar( )
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ret void
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UnifiedReturnBlock:
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ret void
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}
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; If the branch is unpredictable, don't add another branch
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; regardless of whether they are expensive or not.
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define void @unpredictable(i32 %X, i32 %Y, i32 %Z) nounwind {
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; JUMP2-LABEL: unpredictable:
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; JUMP2: # %bb.0: # %entry
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; JUMP2-NEXT: cmpl $0, {{[0-9]+}}(%esp)
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; JUMP2-NEXT: setne %al
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; JUMP2-NEXT: cmpl $4, {{[0-9]+}}(%esp)
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; JUMP2-NEXT: setg %cl
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; JUMP2-NEXT: testb %al, %cl
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; JUMP2-NEXT: jne .LBB1_1
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; JUMP2-NEXT: # %bb.2: # %cond_true
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; JUMP2-NEXT: jmp bar@PLT # TAILCALL
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; JUMP2-NEXT: .LBB1_1: # %UnifiedReturnBlock
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; JUMP2-NEXT: retl
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;
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; JUMP1-LABEL: unpredictable:
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; JUMP1: # %bb.0: # %entry
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; JUMP1-NEXT: cmpl $0, {{[0-9]+}}(%esp)
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; JUMP1-NEXT: setne %al
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; JUMP1-NEXT: cmpl $4, {{[0-9]+}}(%esp)
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; JUMP1-NEXT: setg %cl
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; JUMP1-NEXT: testb %al, %cl
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; JUMP1-NEXT: jne .LBB1_1
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; JUMP1-NEXT: # %bb.2: # %cond_true
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; JUMP1-NEXT: jmp bar@PLT # TAILCALL
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; JUMP1-NEXT: .LBB1_1: # %UnifiedReturnBlock
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; JUMP1-NEXT: retl
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entry:
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%tmp1 = icmp eq i32 %X, 0
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%tmp3 = icmp slt i32 %Y, 5
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%tmp4 = or i1 %tmp3, %tmp1
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br i1 %tmp4, label %cond_true, label %UnifiedReturnBlock, !unpredictable !0
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cond_true:
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%tmp5 = tail call i32 (...) @bar( )
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ret void
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UnifiedReturnBlock:
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ret void
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}
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declare i32 @bar(...)
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!0 = !{}
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