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TheRock/compiler/amd-llvm/llvm/test/CodeGen/X86/constant-hoisting-shift-immediate.ll
derek.holloway 7502bf64a4
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2026-09-02 16:34:47 -07:00

26 lines
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LLVM

; RUN: llc < %s -O3 -mtriple=x86_64-- |FileCheck %s
define i64 @foo(i1 %z, ptr %p, ptr %q)
{
; If const 128 is hoisted to a variable, then in basic block L_val2 we would
; have %lshr2 = lshr i192 %data2, %const, and the definition of %const would
; be in another basic block. As a result, a very inefficient code might be
; produced. Here we check that this doesn't occur.
entry:
%data1 = load i192, ptr %p, align 8
%lshr1 = lshr i192 %data1, 128
%val1 = trunc i192 %lshr1 to i64
br i1 %z, label %End, label %L_val2
; CHECK: movq 16(%rdx), %rax
; CHECK-NEXT: retq
L_val2:
%data2 = load i192, ptr %q, align 8
%lshr2 = lshr i192 %data2, 128
%val2 = trunc i192 %lshr2 to i64
br label %End
End:
%p1 = phi i64 [%val1,%entry], [%val2,%L_val2]
ret i64 %p1
}