26 lines
782 B
LLVM
26 lines
782 B
LLVM
; RUN: llc < %s -O3 -march=x86-64 |FileCheck %s
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define i64 @foo(i1 %z, i192* %p, i192* %q)
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{
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; If const 128 is hoisted to a variable, then in basic block L_val2 we would
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; have %lshr2 = lshr i192 %data2, %const, and the definition of %const would
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; be in another basic block. As a result, a very inefficient code might be
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; produced. Here we check that this doesn't occur.
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entry:
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%data1 = load i192, i192* %p, align 8
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%lshr1 = lshr i192 %data1, 128
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%val1 = trunc i192 %lshr1 to i64
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br i1 %z, label %End, label %L_val2
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; CHECK: movq 16(%rdx), %rax
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; CHECK-NEXT: retq
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L_val2:
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%data2 = load i192, i192* %q, align 8
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%lshr2 = lshr i192 %data2, 128
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%val2 = trunc i192 %lshr2 to i64
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br label %End
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End:
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%p1 = phi i64 [%val1,%entry], [%val2,%L_val2]
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ret i64 %p1
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}
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