1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc < %s -mtriple=i386-unknown-unknown -jump-is-expensive=0 | FileCheck %s --check-prefix=JUMP2 3; RUN: llc < %s -mtriple=i386-unknown-unknown -jump-is-expensive=1 | FileCheck %s --check-prefix=JUMP1 4 5define void @foo(i32 %X, i32 %Y, i32 %Z) nounwind { 6; JUMP2-LABEL: foo: 7; JUMP2: # %bb.0: # %entry 8; JUMP2-NEXT: cmpl $5, {{[0-9]+}}(%esp) 9; JUMP2-NEXT: jl .LBB0_3 10; JUMP2-NEXT: # %bb.1: # %entry 11; JUMP2-NEXT: movl {{[0-9]+}}(%esp), %eax 12; JUMP2-NEXT: testl %eax, %eax 13; JUMP2-NEXT: je .LBB0_3 14; JUMP2-NEXT: # %bb.2: # %UnifiedReturnBlock 15; JUMP2-NEXT: retl 16; JUMP2-NEXT: .LBB0_3: # %cond_true 17; JUMP2-NEXT: jmp bar # TAILCALL 18; 19; JUMP1-LABEL: foo: 20; JUMP1: # %bb.0: # %entry 21; JUMP1-NEXT: cmpl $0, {{[0-9]+}}(%esp) 22; JUMP1-NEXT: setne %al 23; JUMP1-NEXT: cmpl $4, {{[0-9]+}}(%esp) 24; JUMP1-NEXT: setg %cl 25; JUMP1-NEXT: testb %al, %cl 26; JUMP1-NEXT: jne .LBB0_1 27; JUMP1-NEXT: # %bb.2: # %cond_true 28; JUMP1-NEXT: jmp bar # TAILCALL 29; JUMP1-NEXT: .LBB0_1: # %UnifiedReturnBlock 30; JUMP1-NEXT: retl 31entry: 32 %tmp1 = icmp eq i32 %X, 0 33 %tmp3 = icmp slt i32 %Y, 5 34 %tmp4 = or i1 %tmp3, %tmp1 35 br i1 %tmp4, label %cond_true, label %UnifiedReturnBlock 36 37cond_true: 38 %tmp5 = tail call i32 (...) @bar( ) 39 ret void 40 41UnifiedReturnBlock: 42 ret void 43} 44 45; If the branch is unpredictable, don't add another branch 46; regardless of whether they are expensive or not. 47 48define void @unpredictable(i32 %X, i32 %Y, i32 %Z) nounwind { 49; JUMP2-LABEL: unpredictable: 50; JUMP2: # %bb.0: # %entry 51; JUMP2-NEXT: cmpl $0, {{[0-9]+}}(%esp) 52; JUMP2-NEXT: setne %al 53; JUMP2-NEXT: cmpl $4, {{[0-9]+}}(%esp) 54; JUMP2-NEXT: setg %cl 55; JUMP2-NEXT: testb %al, %cl 56; JUMP2-NEXT: jne .LBB1_1 57; JUMP2-NEXT: # %bb.2: # %cond_true 58; JUMP2-NEXT: jmp bar # TAILCALL 59; JUMP2-NEXT: .LBB1_1: # %UnifiedReturnBlock 60; JUMP2-NEXT: retl 61; 62; JUMP1-LABEL: unpredictable: 63; JUMP1: # %bb.0: # %entry 64; JUMP1-NEXT: cmpl $0, {{[0-9]+}}(%esp) 65; JUMP1-NEXT: setne %al 66; JUMP1-NEXT: cmpl $4, {{[0-9]+}}(%esp) 67; JUMP1-NEXT: setg %cl 68; JUMP1-NEXT: testb %al, %cl 69; JUMP1-NEXT: jne .LBB1_1 70; JUMP1-NEXT: # %bb.2: # %cond_true 71; JUMP1-NEXT: jmp bar # TAILCALL 72; JUMP1-NEXT: .LBB1_1: # %UnifiedReturnBlock 73; JUMP1-NEXT: retl 74entry: 75 %tmp1 = icmp eq i32 %X, 0 76 %tmp3 = icmp slt i32 %Y, 5 77 %tmp4 = or i1 %tmp3, %tmp1 78 br i1 %tmp4, label %cond_true, label %UnifiedReturnBlock, !unpredictable !0 79 80cond_true: 81 %tmp5 = tail call i32 (...) @bar( ) 82 ret void 83 84UnifiedReturnBlock: 85 ret void 86} 87 88declare i32 @bar(...) 89 90!0 = !{} 91 92