2016-07-14 09:31:20 +08:00
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; RUN: llc < %s | FileCheck %s -check-prefix=NOIPRA
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; RUN: llc -enable-ipra < %s | FileCheck %s
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target triple = "x86_64--"
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define internal void @foo() norecurse {
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; When IPRA is not enabled R15 will be saved by foo as it is callee saved reg.
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; NOIPRA-LABEL: foo:
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; NOIPRA: pushq %r15
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; When IPRA is enabled none register should be saved as foo() is local function
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; so we optimize it to save no registers.
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; CHECK-LABEL: foo:
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; CHECK-NOT: pushq %r15
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call void asm sideeffect "movl %r14d, %r15d", "~{r15}"()
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ret void
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}
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define void @bar(i32 %X) {
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call void asm sideeffect "movl %r12d, $0", "{r15}~{r12}"(i32 %X)
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; As R15 is clobbered by foo() when IPRA is enabled value of R15 should be
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; saved if register containing orignal value is also getting clobbered
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; and reloaded after foo(), here original value is loaded back into R15D after
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; call to foo.
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call void @foo()
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; CHECK-LABEL: bar:
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; CHECK: callq foo
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[MachineCopyPropagation] Extend pass to do COPY source forwarding
Summary:
This change extends MachineCopyPropagation to do COPY source forwarding
and adds an additional run of the pass to the default pass pipeline just
after register allocation.
This version of this patch uses the newly added
MachineOperand::isRenamable bit to avoid forwarding registers is such a
way as to violate constraints that aren't captured in the
Machine IR (e.g. ABI or ISA constraints).
This change is a continuation of the work started in D30751.
Reviewers: qcolombet, javed.absar, MatzeB, jonpa, tstellar
Subscribers: tpr, mgorny, mcrosier, nhaehnle, nemanjai, jyknight, hfinkel, arsenm, inouehrs, eraman, sdardis, guyblank, fedor.sergeev, aheejin, dschuff, jfb, myatsina, llvm-commits
Differential Revision: https://reviews.llvm.org/D41835
llvm-svn: 323991
2018-02-02 02:54:01 +08:00
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; CHECK-NEXT: movl %edi, %r15d
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2016-07-14 09:31:20 +08:00
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call void asm sideeffect "movl $0, %r12d", "{r15}~{r12}"(i32 %X)
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ret void
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}
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