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[Sink] Don't move calls to readonly functions across stores

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Summary:

Reviewers: hfinkel, majnemer, tstellarAMD, sunfish

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D17279

llvm-svn: 275066
This commit is contained in:
Nicolai Haehnle 2016-07-11 14:11:51 +00:00
parent 3fa0c76630
commit ae937fec7b
2 changed files with 118 additions and 2 deletions
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8
lib/Transforms/Scalar/Sink.cpp
View File

@ -76,11 +76,15 @@ static bool isSafeToMove(Instruction *Inst, AliasAnalysis &AA,
Inst->mayThrow())
return false;
// Convergent operations cannot be made control-dependent on additional
// values.
if (auto CS = CallSite(Inst)) {
// Convergent operations cannot be made control-dependent on additional
// values.
if (CS.hasFnAttr(Attribute::Convergent))
return false;
for (Instruction *S : Stores)
if (AA.getModRefInfo(S, CS) & MRI_Mod)
return false;
}
return true;

112
test/Transforms/Sink/call.ll Normal file
View File

@ -0,0 +1,112 @@
; RUN: opt < %s -basicaa -sink -S | FileCheck %s
declare i32 @f_load_global() nounwind readonly
declare i32 @f_load_arg(i32*) nounwind readonly argmemonly
declare void @f_store_global(i32) nounwind
declare void @f_store_arg(i32*) nounwind argmemonly
declare void @f_readonly_arg(i32* readonly, i32*) nounwind argmemonly
declare i32 @f_readnone(i32) nounwind readnone
@A = external global i32
@B = external global i32
; Sink readonly call if no stores are in the way.
;
; CHECK-LABEL: @test_sink_no_stores(
; CHECK: true:
; CHECK-NEXT: %l = call i32 @f_load_global
; CHECK-NEXT: ret i32 %l
define i32 @test_sink_no_stores(i1 %z) {
%l = call i32 @f_load_global()
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}
; CHECK-LABEL: @test_sink_argmem_store(
; CHECK: true:
; CHECK-NEXT: %l = call i32 @f_load_arg
; CHECK-NEXT: ret i32 %l
define i32 @test_sink_argmem_store(i1 %z) {
%l = call i32 @f_load_arg(i32* @A)
store i32 0, i32* @B
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}
; CHECK-LABEL: @test_sink_argmem_call(
; CHECK: true:
; CHECK-NEXT: %l = call i32 @f_load_arg
; CHECK-NEXT: ret i32 %l
define i32 @test_sink_argmem_call(i1 %z) {
%l = call i32 @f_load_arg(i32* @A)
call void @f_store_arg(i32* @B)
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}
; CHECK-LABEL: @test_sink_argmem_multiple(
; CHECK: true:
; CHECK-NEXT: %l = call i32 @f_load_arg
; CHECK-NEXT: ret i32 %l
define i32 @test_sink_argmem_multiple(i1 %z) {
%l = call i32 @f_load_arg(i32* @A)
call void @f_readonly_arg(i32* @A, i32* @B)
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}
; But don't sink if there is a store.
;
; CHECK-LABEL: @test_nosink_store(
; CHECK: call i32 @f_load_global
; CHECK-NEXT: store i32
define i32 @test_nosink_store(i1 %z) {
%l = call i32 @f_load_global()
store i32 0, i32* @A
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}
; CHECK-LABEL: @test_nosink_call(
; CHECK: call i32 @f_load_global
; CHECK-NEXT: call void @f_store_global
define i32 @test_nosink_call(i1 %z) {
%l = call i32 @f_load_global()
call void @f_store_global(i32 0)
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}
; readnone calls are sunk across stores.
;
; CHECK-LABEL: @test_sink_readnone(
; CHECK: true:
; CHECK-NEXT: %l = call i32 @f_readnone(
; CHECK-NEXT: ret i32 %l
define i32 @test_sink_readnone(i1 %z) {
%l = call i32 @f_readnone(i32 0)
store i32 0, i32* @A
br i1 %z, label %true, label %false
true:
ret i32 %l
false:
ret i32 0
}