https://llvm.org/bugs/show_bug.cgi?id=23470
Bug ID: 23470
Summary: Inefficient lowering of 'musttail' call
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
consider:
target triple = "x86_64-pc-linux"
define void @f(i8* %x) {
%bc = bitcast i8* %x to void (i8*)*
musttail call void (i8*) %bc(i8* %x)
ret void
}
running it through llc gives:
f: # @f
.cfi_startproc
# BB#0:
pushq %rax
.Ltmp0:
.cfi_def_cfa_offset 16
popq %rax
jmpq *%rdi # TAILCALL
.Lfunc_end0:
.size f, .Lfunc_end0-f
.cfi_endproc
The push/pop pair seems superfluous.
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