replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[WebAssembly] Re-enable loop idiom recognition for memcpy et al. 

llvm-svn: 258125
This commit is contained in:
Dan Gohman 2016-01-19 14:49:23 +00:00
parent d4a0d9a78c
commit 0553299586
2 changed files with 1 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
llvm/lib/Analysis/TargetLibraryInfo.cpp
View File

@ -70,9 +70,7 @@ static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
// There are no library implementations of mempcy and memset for AMD gpus and
// these can be difficult to lower in the backend.
if (T.getArch() == Triple::r600 ||
T.getArch() == Triple::amdgcn ||
T.getArch() == Triple::wasm32 ||
T.getArch() == Triple::wasm64) {
T.getArch() == Triple::amdgcn) {
TLI.setUnavailable(LibFunc::memcpy);
TLI.setUnavailable(LibFunc::memset);
TLI.setUnavailable(LibFunc::memset_pattern16);

53
llvm/test/CodeGen/WebAssembly/loop-idiom.ll
View File

@ -1,53 +0,0 @@
; RUN: opt -loop-idiom -S < %s -march=wasm32 | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
target triple = "wasm32-unknown-unknown"
; Make sure loop-idiom doesn't create memcpy or memset. These aren't well
; supported in WebAssembly for now.
;
; TODO Check the patterns are recognized once memcpy / memset are supported.
; CHECK-LABEL: @cpy(
; CHECK-NOT: llvm.memcpy
; CHECK: load
; CHECK: store
define void @cpy(i64 %Size) {
bb.nph:
%Base = alloca i8, i32 10000
%Dest = alloca i8, i32 10000
br label %for.body
for.body:
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8, i8* %Base, i64 %indvar
%DestI = getelementptr i8, i8* %Dest, i64 %indvar
%V = load i8, i8* %I.0.014, align 1
store i8 %V, i8* %DestI, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}
; CHECK-LABEL: @set(
; CHECK-NOT: llvm.memset
; CHECK: store
define void @set(i8* %Base, i64 %Size) {
bb.nph:
br label %for.body
for.body:
%indvar = phi i64 [ 0, %bb.nph ], [ %indvar.next, %for.body ]
%I.0.014 = getelementptr i8, i8* %Base, i64 %indvar
store i8 0, i8* %I.0.014, align 1
%indvar.next = add i64 %indvar, 1
%exitcond = icmp eq i64 %indvar.next, %Size
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}