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https://github.com/c64scene-ar/llvm-6502.git
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8fadf8f4d3
Summary: LLVM's MI level notion of invariant_load is different from LLVM's IR level notion of invariant_load with respect to dereferenceability. The IR notion of invariant_load only guarantees that all *non-faulting* invariant loads result in the same value. The MI notion of invariant load guarantees that the load can be legally moved to any location within its containing function. The MI notion of invariant_load is stronger than the IR notion of invariant_load -- an MI invariant_load is an IR invariant_load + a guarantee that the location being loaded from is dereferenceable throughout the function's lifetime. Reviewers: hfinkel, reames Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10075 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238881 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
443 B
LLVM
25 lines
443 B
LLVM
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
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declare void @free_v()
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define void @f(i32* %x, i32 %c32, i32* %y) {
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; CHECK-LABEL: f
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entry:
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%v = load i32, i32* %x, !invariant.load !0
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; CHECK: movl (%rdi), %ebx
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; CHECK: free_v
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; CHECK-NOT: movl (%rdi), %ebx
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call void @free_v()
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%c = icmp ne i32 %c32, 0
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br i1 %c, label %left, label %merge
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left:
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store i32 %v, i32* %y
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br label %merge
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merge:
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ret void
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}
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!0 = !{}
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