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Add comments and test case for [DAG] Keep the opaque constant flag when performing unary constant folding operations (r204737).

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205474 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Juergen Ributzka 2014-04-02 22:21:01 +00:00
parent e2ed9238bc
commit 75cea2c73e
2 changed files with 29 additions and 1 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -2535,7 +2535,11 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT) {
SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL,
EVT VT, SDValue Operand) {
// Constant fold unary operations with an integer constant operand.
// Constant fold unary operations with an integer constant operand. Even
// opaque constant will be folded, because the folding of unary operations
// doesn't create new constants with different values. Nevertheless, the
// opaque flag is preserved during folding to prevent future folding with
// other constants.
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Operand.getNode())) {
const APInt &Val = C->getAPIntValue();
switch (Opcode) {

24
test/CodeGen/X86/const-base-addr.ll Normal file
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@ -0,0 +1,24 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9.0"
%T = type { i32, i32, i32, i32 }
define i32 @test1() nounwind {
; CHECK-LABEL: test1
; CHECK: movabsq $123456789012345678, %rcx
; CHECK-NEXT: movl 4(%rcx), %eax
; CHECK-NEXT: addl 8(%rcx), %eax
; CHECK-NEXT: addl 12(%rcx), %eax
%addr1 = getelementptr %T* inttoptr (i64 123456789012345678 to %T*), i32 0, i32 1
%tmp1 = load i32* %addr1
%addr2 = getelementptr %T* inttoptr (i64 123456789012345678 to %T*), i32 0, i32 2
%tmp2 = load i32* %addr2
%addr3 = getelementptr %T* inttoptr (i64 123456789012345678 to %T*), i32 0, i32 3
%tmp3 = load i32* %addr3
%tmp4 = add i32 %tmp1, %tmp2
%tmp5 = add i32 %tmp3, %tmp4
ret i32 %tmp5
}