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20571a0c02
Weak functions can be replaced by other functions at link time. Previously it was assumed that no matter what the weak callee function was replaced with it would still share the same TOC as the caller. This is no longer true as a weak callee with a TOC setup can be replaced by another function that was compiled with PC Relative and does not have a TOC at all. This patch makes sure that all calls to functions defined as weak from a caller that has a valid TOC have a nop after the call to allow a place for the linker to restore the TOC. Reviewed By: NeHuang Differential Revision: https://reviews.llvm.org/D91983
27 lines
837 B
LLVM
27 lines
837 B
LLVM
; RUN: llc -filetype=asm -o - -mtriple=powerpc64le-unknown-linux-gnu < %s | FileCheck %s
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declare hidden i32 @callee() nounwind noinline uwtable "function-instrument"="xray-always"
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define i32 @caller() nounwind noinline uwtable "function-instrument"="xray-always" {
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; CHECK-LABEL: .Ltmp0:
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; CHECK: b .Ltmp1
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; CHECK-NEXT: nop
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; CHECK-NEXT: std 0, -8(1)
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; CHECK-NEXT: mflr 0
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; CHECK-NEXT: bl __xray_FunctionEntry
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; CHECK-NEXT: nop
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; CHECK-NEXT: mtlr 0
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; CHECK-LABEL: .Ltmp1:
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; CHECK: bl callee
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; CHECK-NEXT: nop
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%retval = tail call i32 @callee()
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ret i32 %retval
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; CHECK-LABEL: .Ltmp2:
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; CHECK: std 0, -8(1)
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; CHECK-NEXT: mflr 0
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; CHECK-NEXT: bl __xray_FunctionExit
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; CHECK-NEXT: nop
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; CHECK-NEXT: mtlr 0
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}
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