mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-03 18:29:48 +00:00
51458ed09e
RAGreedy::tryAssign will now evict interference from the preferred register even when another register is free. To support this, add the EvictionCost struct that counts how many hints are broken by an eviction. We don't want to break one hint just to satisfy another. Rename canEvict to shouldEvict, and add the first bit of eviction policy that doesn't depend on spill weights: Always make room in the preferred register as long as the evictees can be split and aren't already assigned to their preferred register. Also make the CSR avoidance more accurate. When looking for a cheaper register it is OK to use a new volatile register. Only CSR aliases that have never been used before should be avoided. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134735 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
3.4 KiB
LLVM
82 lines
3.4 KiB
LLVM
; RUN: llc -regalloc=greedy < %s | FileCheck %s
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; LSR shouldn't introduce more induction variables than needed, increasing
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; register pressure and therefore spilling. There is more room for improvement
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; here.
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; CHECK: sub sp, #{{32|28|24}}
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; CHECK: %for.inc
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; CHECK: ldr{{(.w)?}} r{{.*}}, [sp, #
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; CHECK: ldr{{(.w)?}} r{{.*}}, [sp, #
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; CHECK: ldr{{(.w)?}} r{{.*}}, [sp, #
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; CHECK: add
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:64-v128:32:128-a0:0:32-n32"
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target triple = "thumbv7-apple-macosx10.7.0"
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%struct.partition_entry = type { i32, i32, i64, i64 }
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define i32 @partition_overlap_check(%struct.partition_entry* nocapture %part, i32 %num_entries) nounwind readonly optsize ssp {
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entry:
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%cmp79 = icmp sgt i32 %num_entries, 0
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br i1 %cmp79, label %outer.loop, label %for.end72
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outer.loop: ; preds = %for.inc69, %entry
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%overlap.081 = phi i32 [ %overlap.4, %for.inc69 ], [ 0, %entry ]
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%0 = phi i32 [ %inc71, %for.inc69 ], [ 0, %entry ]
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%offset = getelementptr %struct.partition_entry* %part, i32 %0, i32 2
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%len = getelementptr %struct.partition_entry* %part, i32 %0, i32 3
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%tmp5 = load i64* %offset, align 4, !tbaa !0
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%tmp15 = load i64* %len, align 4, !tbaa !0
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%add = add nsw i64 %tmp15, %tmp5
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br label %inner.loop
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inner.loop: ; preds = %for.inc, %outer.loop
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%overlap.178 = phi i32 [ %overlap.081, %outer.loop ], [ %overlap.4, %for.inc ]
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%1 = phi i32 [ 0, %outer.loop ], [ %inc, %for.inc ]
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%cmp23 = icmp eq i32 %0, %1
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br i1 %cmp23, label %for.inc, label %if.end
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if.end: ; preds = %inner.loop
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%len39 = getelementptr %struct.partition_entry* %part, i32 %1, i32 3
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%offset28 = getelementptr %struct.partition_entry* %part, i32 %1, i32 2
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%tmp29 = load i64* %offset28, align 4, !tbaa !0
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%tmp40 = load i64* %len39, align 4, !tbaa !0
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%add41 = add nsw i64 %tmp40, %tmp29
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%cmp44 = icmp sge i64 %tmp29, %tmp5
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%cmp47 = icmp slt i64 %tmp29, %add
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%or.cond = and i1 %cmp44, %cmp47
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%overlap.2 = select i1 %or.cond, i32 1, i32 %overlap.178
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%cmp52 = icmp sle i64 %add41, %add
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%cmp56 = icmp sgt i64 %add41, %tmp5
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%or.cond74 = and i1 %cmp52, %cmp56
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%overlap.3 = select i1 %or.cond74, i32 1, i32 %overlap.2
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%cmp61 = icmp sgt i64 %tmp29, %tmp5
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%cmp65 = icmp slt i64 %add41, %add
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%or.cond75 = or i1 %cmp61, %cmp65
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br i1 %or.cond75, label %for.inc, label %if.then66
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if.then66: ; preds = %if.end
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br label %for.inc
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for.inc: ; preds = %if.end, %if.then66, %inner.loop
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%overlap.4 = phi i32 [ %overlap.178, %inner.loop ], [ 1, %if.then66 ], [ %overlap.3, %if.end ]
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%inc = add nsw i32 %1, 1
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%exitcond = icmp eq i32 %inc, %num_entries
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br i1 %exitcond, label %for.inc69, label %inner.loop
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for.inc69: ; preds = %for.inc
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%inc71 = add nsw i32 %0, 1
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%exitcond83 = icmp eq i32 %inc71, %num_entries
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br i1 %exitcond83, label %for.end72, label %outer.loop
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for.end72: ; preds = %for.inc69, %entry
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%overlap.0.lcssa = phi i32 [ 0, %entry ], [ %overlap.4, %for.inc69 ]
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ret i32 %overlap.0.lcssa
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}
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!0 = metadata !{metadata !"long long", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA", null}
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