llvm-mirror/test/CodeGen/AArch64/zero-reg.ll
Geoff Berry 993081c749 [AArch64] Fold more spilled/refilled COPYs.
Summary:
Make AArch64InstrInfo::foldMemoryOperandImpl more general by folding all
full COPYs between register classes of the same size that are either
spilled or refilled.

Reviewers: MatzeB, qcolombet

Subscribers: aemerson, rengolin, mcrosier, llvm-commits

Differential Revision: https://reviews.llvm.org/D27271

llvm-svn: 288439
2016-12-01 23:43:55 +00:00

31 lines
758 B
LLVM

; RUN: llc -verify-machineinstrs -o - %s -mtriple=aarch64-linux-gnu | FileCheck %s
@var32 = global i32 0
@var64 = global i64 0
define void @test_zr() {
; CHECK-LABEL: test_zr:
store i32 0, i32* @var32
; CHECK: str wzr, [{{x[0-9]+}}, {{#?}}:lo12:var32]
store i64 0, i64* @var64
; CHECK: str xzr, [{{x[0-9]+}}, {{#?}}:lo12:var64]
ret void
; CHECK: ret
}
define void @test_sp(i32 %val) {
; CHECK-LABEL: test_sp:
; Important correctness point here is that LLVM doesn't try to use xzr
; as an addressing register: "str w0, [xzr]" is not a valid A64
; instruction (0b11111 in the Rn field would mean "sp").
%addr = getelementptr i32, i32* null, i64 0
store i32 %val, i32* %addr
; CHECK: str {{w[0-9]+}}, [{{x[0-9]+|sp}}]
ret void
; CHECK: ret
}