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GlobalISel: support 'null' constant in translation.

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It's sharing the integer G_CONSTANT for now since I don't *think* it creates
any ambiguity (even on weird archs). If that turns out wrong we can create a
G_PTRCONSTANT or something.

llvm-svn: 278423
This commit is contained in:
Tim Northover 2016-08-11 21:40:55 +00:00
parent 05c5b8d72c
commit a215c0041c
2 changed files with 11 additions and 0 deletions
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4
lib/CodeGen/GlobalISel/IRTranslator.cpp
View File

@ -296,6 +296,10 @@ bool IRTranslator::translate(const Constant &C, unsigned Reg) {
EntryBuilder.buildConstant(LLT{*CI->getType()}, Reg, CI->getZExtValue());
else if (isa<UndefValue>(C))
EntryBuilder.buildInstr(TargetOpcode::IMPLICIT_DEF).addDef(Reg);
else if (isa<ConstantPointerNull>(C))
EntryBuilder.buildInstr(TargetOpcode::G_CONSTANT, LLT{*C.getType()})
.addDef(Reg)
.addImm(0);
else if (auto CE = dyn_cast<ConstantExpr>(&C)) {
switch(CE->getOpcode()) {
#define HANDLE_INST(NUM, OPCODE, CLASS) \

7
test/CodeGen/AArch64/GlobalISel/arm64-irtranslator.ll
View File

@ -458,3 +458,10 @@ define i32 @test_ashr(i32 %arg1, i32 %arg2) {
%res = ashr i32 %arg1, %arg2
ret i32 %res
}
; CHECK-LABEL: name: test_constant_null
; CHECK: [[NULL:%[0-9]+]](64) = G_CONSTANT p0 0
; CHECK: %x0 = COPY [[NULL]]
define i8* @test_constant_null() {
ret i8* null
}