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813aed1edd
This catches some cases. There are probably ways to improve this. I tried doing it as a combine on the setcc, but that broke some cases involving flag reuse in place of test. I renamed the isX86CCUnsigned to isX86CCSigned and flipped its polarity to make it consistent with the similar functions for ISD::SETCC. This avoids calling EQ/NE as being signed or unsigned. Fixes PR43823. Differential Revision: https://reviews.llvm.org/D69499
32 lines
850 B
LLVM
32 lines
850 B
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 void @bar()
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define void @foo(i64*) {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0: # %start
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; CHECK-NEXT: movl (%rdi), %eax
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; CHECK-NEXT: andl $6, %eax
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; CHECK-NEXT: cmpl $4, %eax
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; CHECK-NEXT: jne .LBB0_2
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; CHECK-NEXT: # %bb.1: # %bb1
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; CHECK-NEXT: retq
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; CHECK-NEXT: .LBB0_2: # %bb2.i
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; CHECK-NEXT: jmp bar # TAILCALL
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start:
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%1 = load i64, i64* %0, align 8, !range !0
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%2 = and i64 %1, 6
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%3 = icmp eq i64 %2, 4
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br i1 %3, label %bb1, label %bb2.i
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bb1: ; preds = %bb2.i, %start
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ret void
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bb2.i: ; preds = %start
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tail call fastcc void @bar()
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br label %bb1
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}
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!0 = !{i64 0, i64 6}
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