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llvm-project/llvm/test/CodeGen/X86/hoist-spill.ll

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Recommit r265547, and r265610,r265639,r265657 on top of it, plus two fixes with one about error verify-regalloc reported, and another about live range update of phi after rematerialization. r265547: Replace analyzeSiblingValues with new algorithm to fix its compile time issue. The patch is to solve PR17409 and its duplicates. analyzeSiblingValues is a N x N complexity algorithm where N is the number of siblings generated by reg splitting. Although it causes siginificant compile time issue when N is large, it is also important for performance since it removes redundent spills and enables rematerialization. To solve the compile time issue, the patch removes analyzeSiblingValues and replaces it with lower cost alternatives containing two parts. The first part creates a new spill hoisting method in postOptimization of register allocation. It does spill hoisting at once after all the spills are generated instead of inside every instance of selectOrSplit. The second part queries the define expr of the original register for rematerializaiton and keep it always available during register allocation even if it is already dead. It deletes those dead instructions only in postOptimization. With the two parts in the patch, it can remove analyzeSiblingValues without sacrificing performance. Patches on top of r265547: r265610 "Fix the compare-clang diff error introduced by r265547." r265639 "Fix the sanitizer bootstrap error in r265547." r265657 "InlineSpiller.cpp: Escap \@ in r265547. [-Wdocumentation]" Differential Revision: http://reviews.llvm.org/D15302 Differential Revision: http://reviews.llvm.org/D18934 Differential Revision: http://reviews.llvm.org/D18935 Differential Revision: http://reviews.llvm.org/D18936 llvm-svn: 266162
2016-04-13 11:08:27 +08:00
; RUN: llc < %s | FileCheck %s
; Check no spills to the same stack slot after hoisting.
; CHECK: mov{{.}} %{{.*}}, [[SPOFFSET1:-?[0-9]*]](%rsp)
; CHECK: mov{{.}} %{{.*}}, [[SPOFFSET2:-?[0-9]*]](%rsp)
; CHECK-NOT: mov{{.}} %{{.*}}, [[SPOFFSET1]](%rsp)
; CHECK-NOT: mov{{.}} %{{.*}}, [[SPOFFSET2]](%rsp)
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@a = external global i32*, align 8
@b = external global i32, align 4
@d = external global i32*, align 8
; Function Attrs: norecurse noreturn nounwind uwtable
define void @fn1(i32 %p1) {
entry:
%tmp = load i32*, i32** @d, align 8
%tmp1 = load i32*, i32** @a, align 8
%tmp2 = sext i32 %p1 to i64
br label %for.cond
for.cond: ; preds = %for.inc14, %entry
%indvar = phi i32 [ %indvar.next, %for.inc14 ], [ 0, %entry ]
%indvars.iv30.in = phi i32 [ %indvars.iv30, %for.inc14 ], [ %p1, %entry ]
%c.0 = phi i32 [ %inc15, %for.inc14 ], [ 1, %entry ]
%k.0 = phi i32 [ %k.1.lcssa, %for.inc14 ], [ undef, %entry ]
%tmp3 = icmp sgt i32 undef, 0
%smax52 = select i1 %tmp3, i32 undef, i32 0
%tmp4 = zext i32 %smax52 to i64
%tmp5 = icmp sgt i64 undef, %tmp4
%smax53 = select i1 %tmp5, i64 undef, i64 %tmp4
%tmp6 = add nsw i64 %smax53, 1
%tmp7 = sub nsw i64 %tmp6, %tmp4
%tmp8 = add nsw i64 %tmp7, -8
%tmp9 = sub i32 undef, %indvar
%tmp10 = icmp sgt i64 %tmp2, 0
%smax40 = select i1 %tmp10, i64 %tmp2, i64 0
%scevgep41 = getelementptr i32, i32* %tmp1, i64 %smax40
%indvars.iv30 = add i32 %indvars.iv30.in, -1
%tmp11 = icmp sgt i32 %indvars.iv30, 0
%smax = select i1 %tmp11, i32 %indvars.iv30, i32 0
%tmp12 = zext i32 %smax to i64
%sub = sub nsw i32 %p1, %c.0
%cmp = icmp sgt i32 %sub, 0
%sub. = select i1 %cmp, i32 %sub, i32 0
%cmp326 = icmp sgt i32 %k.0, %p1
br i1 %cmp326, label %for.cond4.preheader, label %for.body.preheader
for.body.preheader: ; preds = %for.cond
br label %for.body
for.cond4.preheader: ; preds = %for.body, %for.cond
%k.1.lcssa = phi i32 [ %k.0, %for.cond ], [ %add, %for.body ]
%cmp528 = icmp sgt i32 %sub., %p1
br i1 %cmp528, label %for.inc14, label %for.body6.preheader
for.body6.preheader: ; preds = %for.cond4.preheader
br i1 undef, label %for.body6, label %min.iters.checked
min.iters.checked: ; preds = %for.body6.preheader
br i1 undef, label %for.body6, label %vector.memcheck
vector.memcheck: ; preds = %min.iters.checked
%bound1 = icmp ule i32* undef, %scevgep41
%memcheck.conflict = and i1 undef, %bound1
br i1 %memcheck.conflict, label %for.body6, label %vector.body.preheader
vector.body.preheader: ; preds = %vector.memcheck
%lcmp.mod = icmp eq i64 undef, 0
br i1 %lcmp.mod, label %vector.body.preheader.split, label %vector.body.prol
vector.body.prol: ; preds = %vector.body.prol, %vector.body.preheader
%prol.iter.cmp = icmp eq i64 undef, 0
br i1 %prol.iter.cmp, label %vector.body.preheader.split, label %vector.body.prol
vector.body.preheader.split: ; preds = %vector.body.prol, %vector.body.preheader
%tmp13 = icmp ult i64 %tmp8, 24
br i1 %tmp13, label %middle.block, label %vector.body
vector.body: ; preds = %vector.body, %vector.body.preheader.split
%index = phi i64 [ %index.next.3, %vector.body ], [ 0, %vector.body.preheader.split ]
%index.next = add i64 %index, 8
%offset.idx.1 = add i64 %tmp12, %index.next
%tmp14 = getelementptr inbounds i32, i32* %tmp, i64 %offset.idx.1
%tmp15 = bitcast i32* %tmp14 to <4 x i32>*
%wide.load.1 = load <4 x i32>, <4 x i32>* %tmp15, align 4
%tmp16 = getelementptr inbounds i32, i32* %tmp1, i64 %offset.idx.1
%tmp17 = bitcast i32* %tmp16 to <4 x i32>*
store <4 x i32> %wide.load.1, <4 x i32>* %tmp17, align 4
%index.next.3 = add i64 %index, 32
br i1 undef, label %middle.block, label %vector.body
middle.block: ; preds = %vector.body, %vector.body.preheader.split
br i1 undef, label %for.inc14, label %for.body6
for.body: ; preds = %for.body, %for.body.preheader
%k.127 = phi i32 [ %k.0, %for.body.preheader ], [ %add, %for.body ]
%add = add nsw i32 %k.127, 1
%tmp18 = load i32, i32* undef, align 4
store i32 %tmp18, i32* @b, align 4
br i1 undef, label %for.body, label %for.cond4.preheader
for.body6: ; preds = %for.body6, %middle.block, %vector.memcheck, %min.iters.checked, %for.body6.preheader
%indvars.iv32 = phi i64 [ undef, %for.body6 ], [ %tmp12, %vector.memcheck ], [ %tmp12, %min.iters.checked ], [ %tmp12, %for.body6.preheader ], [ undef, %middle.block ]
%arrayidx8 = getelementptr inbounds i32, i32* %tmp, i64 %indvars.iv32
%tmp19 = load i32, i32* %arrayidx8, align 4
%arrayidx10 = getelementptr inbounds i32, i32* %tmp1, i64 %indvars.iv32
store i32 %tmp19, i32* %arrayidx10, align 4
%cmp5 = icmp slt i64 %indvars.iv32, undef
br i1 %cmp5, label %for.body6, label %for.inc14
for.inc14: ; preds = %for.body6, %middle.block, %for.cond4.preheader
%inc15 = add nuw nsw i32 %c.0, 1
%indvar.next = add i32 %indvar, 1
br label %for.cond
}