adc7c589c3
(X & Pow2MaskC) == 0 --> (trunc X) >= 0 (X & Pow2MaskC) != 0 --> (trunc X) < 0 This was noted as a regression in the post-commit feedback for D112634 (where we canonicalized IR differently). For x86, this saves a few instruction bytes. AArch64 seems neutral. Differential Revision: https://reviews.llvm.org/D139363
47 lines
1.1 KiB
LLVM
47 lines
1.1 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-unknown | FileCheck %s
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declare dso_local void @bar()
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define void @test1(i64 %foo) nounwind {
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; CHECK-LABEL: test1:
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; CHECK: # %bb.0:
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; CHECK-NEXT: btq $32, %rdi
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; CHECK-NEXT: jb .LBB0_2
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; CHECK-NEXT: # %bb.1: # %if.end
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; CHECK-NEXT: retq
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; CHECK-NEXT: .LBB0_2: # %if.then
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; CHECK-NEXT: jmp bar # TAILCALL
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%and = and i64 %foo, 4294967296
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%tobool = icmp eq i64 %and, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then:
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tail call void @bar() nounwind
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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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define void @test2(i64 %foo) nounwind {
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; CHECK-LABEL: test2:
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; CHECK: # %bb.0:
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; CHECK-NEXT: testl %edi, %edi
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; CHECK-NEXT: js .LBB1_2
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; CHECK-NEXT: # %bb.1: # %if.end
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; CHECK-NEXT: retq
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; CHECK-NEXT: .LBB1_2: # %if.then
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; CHECK-NEXT: jmp bar # TAILCALL
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%and = and i64 %foo, 2147483648
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%tobool = icmp eq i64 %and, 0
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br i1 %tobool, label %if.end, label %if.then
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if.then:
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tail call void @bar() nounwind
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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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