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WebAssembly: disable some loop-idiom recognition

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memset/memcpy aren't fully supported yet. We should invert this test
once they are supported.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251534 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
JF Bastien 2015-10-28 17:50:23 +00:00
parent ea4e018fba
commit a2446f8d17
2 changed files with 56 additions and 1 deletions
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4
lib/Analysis/TargetLibraryInfo.cpp
View File

@ -64,7 +64,9 @@ 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::amdgcn ||
T.getArch() == Triple::wasm32 ||
T.getArch() == Triple::wasm64) {
TLI.setUnavailable(LibFunc::memcpy);
TLI.setUnavailable(LibFunc::memset);
TLI.setUnavailable(LibFunc::memset_pattern16);

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

@ -0,0 +1,53 @@
; RUN: opt -loop-idiom -S < %s -march=wasm32 | FileCheck %s
target datalayout = "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
}