derek.holloway
7502bf64a4
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53 lines
2.1 KiB
LLVM
53 lines
2.1 KiB
LLVM
; RUN: llc -mcpu=generic -mtriple=i386-apple-darwin -tailcallopt -enable-misched=false < %s | FileCheck %s
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; Check that lowered arguments do not overwrite the return address before it is moved.
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; Bug 6225
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;
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; If a call is a fastcc tail call and tail call optimization is enabled, the
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; caller frame is replaced by the callee frame. This can require that arguments are
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; placed on the former return address stack slot. Special care needs to be taken
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; taken that the return address is moved / or stored in a register before
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; lowering of arguments potentially overwrites the value.
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;
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; Move return address (76(%esp)) to a temporary register (%ebp)
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; CHECK: movl 76(%esp), [[REGISTER:%[a-z]+]]
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; Overwrite return addresss
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; CHECK: movl [[EBX:%[a-z]+]], 76(%esp)
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; Move return address from temporary register (%ebp) to new stack location (60(%esp))
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; CHECK: movl [[REGISTER]], 60(%esp)
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%tupl = type [9 x i32]
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declare fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) nounwind
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declare fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind
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define fastcc void @l186(ptr %r1) nounwind {
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entry:
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%r2 = load i32, ptr %r1
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%ptr3 = getelementptr %tupl, ptr %r1, i32 0, i32 1
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%r3 = load i32, ptr %ptr3
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%ptr5 = getelementptr %tupl, ptr %r1, i32 0, i32 2
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%r4 = load i32, ptr %ptr5
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%ptr7 = getelementptr %tupl, ptr %r1, i32 0, i32 3
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%r5 = load i32, ptr %ptr7
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%ptr9 = getelementptr %tupl, ptr %r1, i32 0, i32 4
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%r6 = load i32, ptr %ptr9
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%ptr11 = getelementptr %tupl, ptr %r1, i32 0, i32 5
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%r7 = load i32, ptr %ptr11
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%ptr13 = getelementptr %tupl, ptr %r1, i32 0, i32 6
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%r8 = load i32, ptr %ptr13
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%ptr15 = getelementptr %tupl, ptr %r1, i32 0, i32 7
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%r9 = load i32, ptr %ptr15
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%ptr17 = getelementptr %tupl, ptr %r1, i32 0, i32 8
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%r10 = load i32, ptr %ptr17
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%cond = icmp eq i32 %r10, 3
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br i1 %cond, label %true, label %false
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true:
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tail call fastcc void @l297(i32 %r10, i32 %r9, i32 %r8, i32 %r7, i32 %r6, i32 %r5, i32 %r3, i32 %r2) nounwind
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ret void
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false:
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tail call fastcc void @l298(i32 %r10, i32 %r9, i32 %r4) nounwind
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ret void
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}
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