derek.holloway
7502bf64a4
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75 lines
2.1 KiB
LLVM
75 lines
2.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -O2 | FileCheck %s
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; Test for issue #160612: OR conditions in branches should use multiple branches
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; instead of materializing booleans with SETCC when no special optimizations apply.
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declare void @subroutine_foo()
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declare void @subroutine_bar()
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; Original issue: (x == 0 || y == 0) was generating SETCC + TEST + BRANCH
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; instead of using two conditional branches directly.
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define void @func_a(i32 noundef %x, i32 noundef %y) {
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; CHECK-LABEL: func_a:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: testl %edi, %edi
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; CHECK-NEXT: je subroutine_foo@PLT # TAILCALL
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; CHECK-NEXT: # %bb.1: # %entry
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; CHECK-NEXT: testl %esi, %esi
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; CHECK-NEXT: jne subroutine_bar@PLT # TAILCALL
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; CHECK-NEXT: # %bb.2: # %if.then
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; CHECK-NEXT: jmp subroutine_foo@PLT # TAILCALL
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entry:
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%cmp = icmp eq i32 %x, 0
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%cmp1 = icmp eq i32 %y, 0
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%or.cond = or i1 %cmp, %cmp1
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br i1 %or.cond, label %if.then, label %if.else
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if.then:
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tail call void @subroutine_foo()
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br label %if.end
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if.else:
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tail call void @subroutine_bar()
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br label %if.end
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if.end:
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ret void
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}
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; Reference implementation that already generated optimal code.
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; This should continue to generate the same optimal code.
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define void @func_b(i32 noundef %x, i32 noundef %y) {
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; CHECK-LABEL: func_b:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: testl %edi, %edi
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; CHECK-NEXT: je subroutine_foo@PLT # TAILCALL
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; CHECK-NEXT: # %bb.1: # %if.else
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; CHECK-NEXT: testl %esi, %esi
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; CHECK-NEXT: je subroutine_foo@PLT # TAILCALL
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; CHECK-NEXT: # %bb.2: # %if.else3
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; CHECK-NEXT: jmp subroutine_bar@PLT # TAILCALL
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entry:
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%cmp = icmp eq i32 %x, 0
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br i1 %cmp, label %if.then, label %if.else
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if.then:
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tail call void @subroutine_foo()
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br label %if.end4
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if.else:
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%cmp1 = icmp eq i32 %y, 0
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br i1 %cmp1, label %if.then2, label %if.else3
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if.then2:
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tail call void @subroutine_foo()
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br label %if.end4
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if.else3:
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tail call void @subroutine_bar()
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br label %if.end4
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if.end4:
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ret void
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}
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