mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-04 07:29:20 +00:00
461f1fc359
The theory is it's still faster than a pair of movq / a quad of movl. This will probably hurt older chips like P4 but should run faster on current and future Intel processors. rdar://8817010 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122955 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
2.1 KiB
LLVM
90 lines
2.1 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu | FileCheck %s -check-prefix=LINUX
|
|
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s -check-prefix=DARWIN
|
|
|
|
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
|
|
|
|
|
|
; Variable memcpy's should lower to calls.
|
|
define i8* @test1(i8* %a, i8* %b, i64 %n) nounwind {
|
|
entry:
|
|
tail call void @llvm.memcpy.p0i8.p0i8.i64( i8* %a, i8* %b, i64 %n, i32 1, i1 0 )
|
|
ret i8* %a
|
|
|
|
; LINUX: test1:
|
|
; LINUX: memcpy
|
|
}
|
|
|
|
; Variable memcpy's should lower to calls.
|
|
define i8* @test2(i64* %a, i64* %b, i64 %n) nounwind {
|
|
entry:
|
|
%tmp14 = bitcast i64* %a to i8*
|
|
%tmp25 = bitcast i64* %b to i8*
|
|
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %tmp14, i8* %tmp25, i64 %n, i32 8, i1 0 )
|
|
ret i8* %tmp14
|
|
|
|
; LINUX: test2:
|
|
; LINUX: memcpy
|
|
}
|
|
|
|
; Large constant memcpy's should lower to a call when optimizing for size.
|
|
; PR6623
|
|
|
|
; On the other hand, Darwin's definition of -Os is optimizing for size without
|
|
; hurting performance so it should just ignore optsize when expanding memcpy.
|
|
; rdar://8821501
|
|
define void @test3(i8* nocapture %A, i8* nocapture %B) nounwind optsize noredzone {
|
|
entry:
|
|
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 64, i32 1, i1 false)
|
|
ret void
|
|
; LINUX: test3:
|
|
; LINUX-NOT: memcpy
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
; LINUX: movups
|
|
|
|
; DARWIN: test3:
|
|
; DARWIN-NOT: memcpy
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
; DARWIN: movups
|
|
}
|
|
|
|
; Large constant memcpy's should be inlined when not optimizing for size.
|
|
define void @test4(i8* nocapture %A, i8* nocapture %B) nounwind noredzone {
|
|
entry:
|
|
tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %A, i8* %B, i64 64, i32 1, i1 false)
|
|
ret void
|
|
; LINUX: test4:
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
; LINUX movq
|
|
}
|
|
|