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Similar to bitcast, treat addrspacecast as a foldable operand.

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Added a test sink-addrspacecast.ll to verify this change.

Patch by Jingyue Wu.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209343 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky 2014-05-22 00:02:52 +00:00
parent a2f371b8eb
commit 107db21c2b
2 changed files with 39 additions and 0 deletions
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2
lib/CodeGen/CodeGenPrepare.cpp
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@ -1640,6 +1640,7 @@ bool AddressingModeMatcher::MatchScaledValue(Value *ScaleReg, int64_t Scale,
static bool MightBeFoldableInst(Instruction *I) {
switch (I->getOpcode()) {
case Instruction::BitCast:
case Instruction::AddrSpaceCast:
// Don't touch identity bitcasts.
if (I->getType() == I->getOperand(0)->getType())
return false;
@ -1994,6 +1995,7 @@ bool AddressingModeMatcher::MatchOperationAddr(User *AddrInst, unsigned Opcode,
return MatchAddr(AddrInst->getOperand(0), Depth);
return false;
case Instruction::BitCast:
case Instruction::AddrSpaceCast:
// BitCast is always a noop, and we can handle it as long as it is
// int->int or pointer->pointer (we don't want int<->fp or something).
if ((AddrInst->getOperand(0)->getType()->isPointerTy() ||

37
test/Transforms/CodeGenPrepare/X86/sink-addrspacecast.ll Normal file
View File

@ -0,0 +1,37 @@
; RUN: opt -S -codegenprepare < %s | FileCheck %s
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-unknown-linux-gnu"
; CHECK-LABEL: @load_cast_gep
; CHECK: add i64 %sunkaddr, 40
define void @load_cast_gep(i1 %cond, i64* %base) {
entry:
%addr = getelementptr inbounds i64* %base, i64 5
%casted = addrspacecast i64* %addr to i32 addrspace(1)*
br i1 %cond, label %if.then, label %fallthrough
if.then:
%v = load i32 addrspace(1)* %casted, align 4
br label %fallthrough
fallthrough:
ret void
}
; CHECK-LABEL: @store_gep_cast
; CHECK: add i64 %sunkaddr, 20
define void @store_gep_cast(i1 %cond, i64* %base) {
entry:
%casted = addrspacecast i64* %base to i32 addrspace(1)*
%addr = getelementptr inbounds i32 addrspace(1)* %casted, i64 5
br i1 %cond, label %if.then, label %fallthrough
if.then:
store i32 0, i32 addrspace(1)* %addr, align 4
br label %fallthrough
fallthrough:
ret void
}