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llvm-project/llvm/test/CodeGen/X86/ipra-local-linkage.ll

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Add missing test for r275347 "[IPRA] Set callee saved registers to none for local function when IPRA is enabled." llvm-svn: 275358
2016-07-14 09:31:20 +08:00
; RUN: llc < %s | FileCheck %s -check-prefix=NOIPRA
; RUN: llc -enable-ipra < %s | FileCheck %s
target triple = "x86_64--"
define internal void @foo() norecurse {
; When IPRA is not enabled R15 will be saved by foo as it is callee saved reg.
; NOIPRA-LABEL: foo:
; NOIPRA: pushq %r15
; When IPRA is enabled none register should be saved as foo() is local function
; so we optimize it to save no registers.
; CHECK-LABEL: foo:
; CHECK-NOT: pushq %r15
call void asm sideeffect "movl %r14d, %r15d", "~{r15}"()
ret void
}
define void @bar(i32 %X) {
call void asm sideeffect "movl %r12d, $0", "{r15}~{r12}"(i32 %X)
; As R15 is clobbered by foo() when IPRA is enabled value of R15 should be
; saved if register containing orignal value is also getting clobbered
; and reloaded after foo(), here original value is loaded back into R15D after
; call to foo.
call void @foo()
; CHECK-LABEL: bar:
; CHECK: callq foo
Re-enable "[MachineCopyPropagation] Extend pass to do COPY source forwarding" Issues addressed since original review: - Moved removal of dead instructions found by LiveIntervals::shrinkToUses() outside of loop iterating over instructions to avoid instructions being deleted while pointed to by iterator. - Fixed ARMLoadStoreOptimizer bug exposed by this change in r311907. - The pass no longer forwards COPYs to physical register uses, since doing so can break code that implicitly relies on the physical register number of the use. - The pass no longer forwards COPYs to undef uses, since doing so can break the machine verifier by creating LiveRanges that don't end on a use (since the undef operand is not considered a use). [MachineCopyPropagation] Extend pass to do COPY source forwarding This change extends MachineCopyPropagation to do COPY source forwarding. This change also extends the MachineCopyPropagation pass to be able to be run during register allocation, after physical registers have been assigned, but before the virtual registers have been re-written, which allows it to remove virtual register COPY LiveIntervals that become dead through the forwarding of all of their uses. llvm-svn: 312328
2017-09-01 22:27:20 +08:00
; CHECK-NEXT: movl %edi, %r15d
Add missing test for r275347 "[IPRA] Set callee saved registers to none for local function when IPRA is enabled." llvm-svn: 275358
2016-07-14 09:31:20 +08:00
call void asm sideeffect "movl $0, %r12d", "{r15}~{r12}"(i32 %X)
ret void
}