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71997f303e
outside the loop and reducible. This more completely hides them from LSR, which isn't usually able to do anything meaningful with non-affine expressions anyway, and this consequently hides them from SCEVExpander, which is acutely unprepared for non-affine expressions. Replace test/CodeGen/X86/lsr-nonaffine.ll with a new test that tests the new behavior. This works around the bug in PR10117 / rdar://problem/9633149, and is generally an improvement besides. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134268 91177308-0d34-0410-b5e6-96231b3b80d8
31 lines
845 B
LLVM
31 lines
845 B
LLVM
; RUN: llc -asm-verbose=false -march=x86-64 -o - < %s | FileCheck %s
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; LSR should leave non-affine expressions alone because it currently
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; doesn't know how to do anything with them, and when it tries, it
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; gets SCEVExpander's current expansion for them, which is suboptimal.
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; CHECK: xorl %eax, %eax
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; CHECK-NEXT: align
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; CHECK-NEXT: BB0_1:
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; CHECK-NEXT: movq %rax, (%rdx)
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; CHECK-NEXT: addq %rsi, %rax
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; CHECK-NEXT: cmpq %rdi, %rax
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; CHECK-NEXT: jl
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; CHECK-NEXT: imulq %rax, %rax
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; CHECK-NEXT: ret
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define i64 @foo(i64 %n, i64 %s, i64* %p) nounwind {
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entry:
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br label %loop
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loop:
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%i = phi i64 [ 0, %entry ], [ %i.next, %loop ]
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volatile store i64 %i, i64* %p
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%i.next = add i64 %i, %s
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%c = icmp slt i64 %i.next, %n
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br i1 %c, label %loop, label %exit
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exit:
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%mul = mul i64 %i.next, %i.next
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ret i64 %mul
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}
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