derek.holloway
7502bf64a4
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92 lines
2.7 KiB
LLVM
92 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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; RUN: llc < %s -mtriple=riscv64 | FileCheck %s --check-prefix=CHEAP
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; RUN: llc < %s -mtriple=riscv64 -jump-is-expensive=0 | FileCheck %s --check-prefix=CHEAP
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; RUN: llc < %s -mtriple=riscv64 -jump-is-expensive=1 | FileCheck %s --check-prefix=EXPENSIVE
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define void @foo(i32 %X, i32 %Y, i32 %Z) nounwind {
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; CHEAP-LABEL: foo:
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; CHEAP: # %bb.0: # %entry
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; CHEAP-NEXT: sext.w a1, a1
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; CHEAP-NEXT: li a2, 5
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; CHEAP-NEXT: blt a1, a2, .LBB0_3
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; CHEAP-NEXT: # %bb.1: # %entry
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; CHEAP-NEXT: sext.w a0, a0
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; CHEAP-NEXT: beqz a0, .LBB0_3
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; CHEAP-NEXT: # %bb.2: # %UnifiedReturnBlock
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; CHEAP-NEXT: ret
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; CHEAP-NEXT: .LBB0_3: # %cond_true
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; CHEAP-NEXT: tail bar
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;
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; EXPENSIVE-LABEL: foo:
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; EXPENSIVE: # %bb.0: # %entry
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; EXPENSIVE-NEXT: sext.w a1, a1
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; EXPENSIVE-NEXT: sext.w a0, a0
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; EXPENSIVE-NEXT: seqz a0, a0
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; EXPENSIVE-NEXT: slti a1, a1, 5
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; EXPENSIVE-NEXT: or a0, a0, a1
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; EXPENSIVE-NEXT: beqz a0, .LBB0_2
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; EXPENSIVE-NEXT: # %bb.1: # %cond_true
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; EXPENSIVE-NEXT: tail bar
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; EXPENSIVE-NEXT: .LBB0_2: # %UnifiedReturnBlock
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; EXPENSIVE-NEXT: ret
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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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; CHEAP-LABEL: unpredictable:
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; CHEAP: # %bb.0: # %entry
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; CHEAP-NEXT: sext.w a1, a1
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; CHEAP-NEXT: sext.w a0, a0
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; CHEAP-NEXT: seqz a0, a0
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; CHEAP-NEXT: slti a1, a1, 5
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; CHEAP-NEXT: or a0, a0, a1
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; CHEAP-NEXT: beqz a0, .LBB1_2
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; CHEAP-NEXT: # %bb.1: # %cond_true
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; CHEAP-NEXT: tail bar
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; CHEAP-NEXT: .LBB1_2: # %UnifiedReturnBlock
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; CHEAP-NEXT: ret
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;
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; EXPENSIVE-LABEL: unpredictable:
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; EXPENSIVE: # %bb.0: # %entry
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; EXPENSIVE-NEXT: sext.w a1, a1
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; EXPENSIVE-NEXT: sext.w a0, a0
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; EXPENSIVE-NEXT: seqz a0, a0
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; EXPENSIVE-NEXT: slti a1, a1, 5
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; EXPENSIVE-NEXT: or a0, a0, a1
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; EXPENSIVE-NEXT: beqz a0, .LBB1_2
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; EXPENSIVE-NEXT: # %bb.1: # %cond_true
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; EXPENSIVE-NEXT: tail bar
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; EXPENSIVE-NEXT: .LBB1_2: # %UnifiedReturnBlock
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; EXPENSIVE-NEXT: ret
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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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