llvm-6502/test/CodeGen/AArch64/arm64-fast-isel.ll
Juergen Ributzka d445e4acdb [FastISel][AArch64] Use the zero register for stores.
Use the zero register directly when possible to avoid an unnecessary register
copy and a wasted register at -O0. This also uses integer stores to store a
positive floating-point zero. This saves us from materializing the positive zero
in a register and then storing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216617 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-27 21:04:52 +00:00

94 lines
2.0 KiB
LLVM

; RUN: llc -O0 -fast-isel-abort -verify-machineinstrs -mtriple=arm64-apple-darwin < %s | FileCheck %s
define void @t0(i32 %a) nounwind {
entry:
; CHECK: t0
; CHECK: str {{w[0-9]+}}, [sp, #12]
; CHECK-NEXT: ldr [[REGISTER:w[0-9]+]], [sp, #12]
; CHECK-NEXT: str [[REGISTER]], [sp, #12]
; CHECK: ret
%a.addr = alloca i32, align 4
store i32 %a, i32* %a.addr
%tmp = load i32* %a.addr
store i32 %tmp, i32* %a.addr
ret void
}
define void @t1(i64 %a) nounwind {
; CHECK: t1
; CHECK: str {{x[0-9]+}}, [sp, #8]
; CHECK-NEXT: ldr [[REGISTER:x[0-9]+]], [sp, #8]
; CHECK-NEXT: str [[REGISTER]], [sp, #8]
; CHECK: ret
%a.addr = alloca i64, align 4
store i64 %a, i64* %a.addr
%tmp = load i64* %a.addr
store i64 %tmp, i64* %a.addr
ret void
}
define zeroext i1 @i1(i1 %a) nounwind {
entry:
; CHECK: @i1
; CHECK: and w0, w0, #0x1
; CHECK: strb w0, [sp, #15]
; CHECK: ldrb w0, [sp, #15]
; CHECK: and w0, w0, #0x1
; CHECK: and w0, w0, #0x1
; CHECK: add sp, sp, #16
; CHECK: ret
%a.addr = alloca i1, align 1
store i1 %a, i1* %a.addr, align 1
%0 = load i1* %a.addr, align 1
ret i1 %0
}
define i32 @t2(i32 *%ptr) nounwind {
entry:
; CHECK-LABEL: t2:
; CHECK: ldur w0, [x0, #-4]
; CHECK: ret
%0 = getelementptr i32 *%ptr, i32 -1
%1 = load i32* %0, align 4
ret i32 %1
}
define i32 @t3(i32 *%ptr) nounwind {
entry:
; CHECK-LABEL: t3:
; CHECK: ldur w0, [x0, #-256]
; CHECK: ret
%0 = getelementptr i32 *%ptr, i32 -64
%1 = load i32* %0, align 4
ret i32 %1
}
define void @t4(i32 *%ptr) nounwind {
entry:
; CHECK-LABEL: t4:
; CHECK: stur wzr, [x0, #-4]
; CHECK: ret
%0 = getelementptr i32 *%ptr, i32 -1
store i32 0, i32* %0, align 4
ret void
}
define void @t5(i32 *%ptr) nounwind {
entry:
; CHECK-LABEL: t5:
; CHECK: stur wzr, [x0, #-256]
; CHECK: ret
%0 = getelementptr i32 *%ptr, i32 -64
store i32 0, i32* %0, align 4
ret void
}
define void @t6() nounwind {
; CHECK: t6
; CHECK: brk #0x1
tail call void @llvm.trap()
ret void
}
declare void @llvm.trap() nounwind