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e4eff4b231
If we duplicate an instruction then we must also clear kill flags on any uses we rewrite. Otherwise we might be killing a register which was used in other BBs. For example, here the entry BB ended up with these instructions, the ADD having been tail duplicated. %vreg24<def> = t2ADDri %vreg10<kill>, 1, pred:14, pred:%noreg, opt:%noreg; GPRnopc:%vreg24 rGPR:%vreg10 %vreg22<def> = COPY %vreg10; GPR:%vreg22 rGPR:%vreg10 The copy here is inserted after the add and so needs vreg10 to be live. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236782 91177308-0d34-0410-b5e6-96231b3b80d8
55 lines
2.0 KiB
LLVM
55 lines
2.0 KiB
LLVM
; RUN: llc %s -o - -fast-isel=true -O1 -verify-machineinstrs | FileCheck %s
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target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
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target triple = "thumbv7-apple-ios8.0.0"
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; Tail duplication was incorrectly leaving kill flags on the duplicated instructions.
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; The machine verifier is able to spot this error, so this test should pass if it passes verification.
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; CHECK-LABEL: @test
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%struct.cdiff_ctx = type { i8*, %struct.cdiff_node*, %struct.cdiff_node*, %struct.cdiff_node*, %struct.cdiff_node* }
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%struct.cdiff_node = type { i32, i8*, i8*, %struct.cdiff_node* }
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declare i32 @logg(i32)
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define hidden i32 @test(%struct.cdiff_ctx* nocapture %ctx, %struct.cdiff_node* %tmp10) {
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bb:
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br label %.outer
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bb33: ; preds = %bb92, %.outer
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%lines.0 = phi i32 [ %tmp37, %bb92 ], [ %lines.0.ph, %.outer ]
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%tmp37 = add i32 %lines.0, 1
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%tmp39 = load i32, i32* %tmp57, align 4
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%tmp40 = icmp eq i32 %tmp39, %tmp37
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br i1 %tmp40, label %bb41, label %bb92
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bb41: ; preds = %bb33
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%tmp45 = call i32 @strncmp()
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%tmp46 = icmp eq i32 %tmp45, 0
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br i1 %tmp46, label %bb53, label %bb47
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bb47: ; preds = %bb41
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%tmp52 = call i32 @logg(i32 %tmp37)
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ret i32 -1
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bb53: ; preds = %bb41
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%tmp54 = getelementptr inbounds %struct.cdiff_node, %struct.cdiff_node* %del.0.ph, i32 0, i32 3
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%tmp55 = load %struct.cdiff_node*, %struct.cdiff_node** %tmp54, align 4
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br label %.outer
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.outer: ; preds = %bb53, %bb
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%del.0.ph = phi %struct.cdiff_node* [ %tmp55, %bb53 ], [ null, %bb ]
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%lines.0.ph = phi i32 [ 1, %bb53 ], [ 0, %bb ]
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%tmp57 = getelementptr inbounds %struct.cdiff_node, %struct.cdiff_node* %del.0.ph, i32 0, i32 0
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br label %bb33
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bb92: ; preds = %bb33
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%tmp93 = call i32 @puts()
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br label %bb33
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}
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declare i32 @strncmp()
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declare i32 @puts()
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