derek.holloway
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100 lines
2.6 KiB
YAML
100 lines
2.6 KiB
YAML
# In certain cases CodeGenPrepare folds a return instruction into
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# the return block's predecessor blocks and subsequently deletes the return block.
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# The purpose of this is to enable tail call optimization in the predecessor blocks.
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# Removal of the return block also removes fake use instructions that were present
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# in the return block, potentially causing debug information to be lost.
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#
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# The fix is to clone any fake use instructions that are not dominated by definitions
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# in the return block itself into the predecessor blocks. This test enures that we do so.
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#
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# Generated from the following source with
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# clang -fextend-variable-liveness -S -emit-llvm -O2 -mllvm -stop-before=codegenprepare -o test.mir test.c
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#
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# extern int f0();
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# extern int f1();
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#
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# int foo(int i) {
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# int temp = i;
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# if (temp == 0)
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# temp = f0();
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# else
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# temp = f1();
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# return temp;
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# }
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#
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# RUN: llc -run-pass=codegenprepare -mtriple=x86_64-unknown-linux -o - %s | FileCheck %s
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#
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# CHECK: define{{.*}}foo
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# CHECK: if.then:
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# CHECK-NEXT: call{{.*}}fake.use(i32 %i)
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# CHECK-NEXT: tail call i32{{.*}}@f0
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# CHECK-NEXT: ret
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# CHECK: if.else:
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# CHECK-NEXT: call{{.*}}fake.use(i32 %i)
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# CHECK-NEXT: tail call i32{{.*}}@f1
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# CHECK-NEXT: ret
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--- |
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define hidden i32 @foo(i32 %i) local_unnamed_addr optdebug {
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entry:
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%cmp = icmp eq i32 %i, 0
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br i1 %cmp, label %if.then, label %if.else
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if.then:
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%call = tail call i32 (...) @f0()
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br label %if.end
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if.else:
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%call1 = tail call i32 (...) @f1()
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br label %if.end
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if.end:
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%temp.0 = phi i32 [ %call, %if.then ], [ %call1, %if.else ]
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notail call void (...) @llvm.fake.use(i32 %temp.0)
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notail call void (...) @llvm.fake.use(i32 %i)
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ret i32 %temp.0
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}
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declare i32 @f0(...) local_unnamed_addr
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declare i32 @f1(...) local_unnamed_addr
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...
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---
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name: foo
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alignment: 16
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers: []
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liveins: []
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 1
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adjustsStack: false
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hasCalls: false
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stackProtector: ''
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maxCallFrameSize: 4294967295
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: []
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restorePoint: []
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fixedStack: []
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stack: []
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callSites: []
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constants: []
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machineFunctionInfo: {}
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body: |
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...
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