cbdccb30c2
If a virtual register is not assigned preferred physical register, it means some COPY instructions will be changed to real register move instructions. In this case we can try to split the virtual register in colder blocks, if success, the original COPY instructions can be deleted, and the new COPY instructions in colder blocks will be generated as register move instructions. It results in fewer dynamic register move instructions executed. The new test case split-reg-with-hint.ll gives an example, the hot path contains 24 instructions without this patch, now it is only 4 instructions with this patch. Differential Revision: https://reviews.llvm.org/D156491
50 lines
2.8 KiB
LLVM
50 lines
2.8 KiB
LLVM
; RUN: llc -verify-machineinstrs -mcpu=pwr7 -O2 -relocation-model=pic < %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -mcpu=pwr7 -O2 -relocation-model=pic < %s | grep "__tls_get_addr" | count 1
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; This test was derived from LLVM's own
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; PrettyStackTraceEntry::~PrettyStackTraceEntry(). It demonstrates an
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; opportunity for CSE of calls to __tls_get_addr().
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target datalayout = "e-m:e-i64:64-n32:64"
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target triple = "powerpc64le-unknown-linux-gnu"
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%"class.llvm::PrettyStackTraceEntry" = type { ptr, ptr }
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@_ZTVN4llvm21PrettyStackTraceEntryE = unnamed_addr constant [5 x ptr] [ptr null, ptr null, ptr @_ZN4llvm21PrettyStackTraceEntryD2Ev, ptr @_ZN4llvm21PrettyStackTraceEntryD0Ev, ptr @__cxa_pure_virtual], align 8
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@_ZL20PrettyStackTraceHead = internal thread_local unnamed_addr global ptr null, align 8
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@.str = private unnamed_addr constant [87 x i8] c"PrettyStackTraceHead == this && \22Pretty stack trace entry destruction is out of order\22\00", align 1
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@.str1 = private unnamed_addr constant [64 x i8] c"/home/wschmidt/llvm/llvm-test2/lib/Support/PrettyStackTrace.cpp\00", align 1
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@__PRETTY_FUNCTION__._ZN4llvm21PrettyStackTraceEntryD2Ev = private unnamed_addr constant [62 x i8] c"virtual llvm::PrettyStackTraceEntry::~PrettyStackTraceEntry()\00", align 1
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declare void @_ZN4llvm21PrettyStackTraceEntryD2Ev(ptr %this) unnamed_addr
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declare void @__cxa_pure_virtual()
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declare void @__assert_fail(ptr, ptr, i32 zeroext, ptr)
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declare void @_ZdlPv(ptr)
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define void @_ZN4llvm21PrettyStackTraceEntryD0Ev(ptr %this) unnamed_addr align 2 {
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entry:
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store ptr getelementptr inbounds ([5 x ptr], ptr @_ZTVN4llvm21PrettyStackTraceEntryE, i64 0, i64 2), ptr %this, align 8
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%0 = load ptr, ptr @_ZL20PrettyStackTraceHead, align 8
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%cmp.i = icmp eq ptr %0, %this
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br i1 %cmp.i, label %_ZN4llvm21PrettyStackTraceEntryD2Ev.exit, label %cond.false.i
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cond.false.i: ; preds = %entry
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tail call void @__assert_fail(ptr @.str, ptr @.str1, i32 zeroext 119, ptr @__PRETTY_FUNCTION__._ZN4llvm21PrettyStackTraceEntryD2Ev)
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unreachable
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_ZN4llvm21PrettyStackTraceEntryD2Ev.exit: ; preds = %entry
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%NextEntry.i.i = getelementptr inbounds %"class.llvm::PrettyStackTraceEntry", ptr %this, i64 0, i32 1
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%1 = load i64, ptr %NextEntry.i.i, align 8
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store i64 %1, ptr @_ZL20PrettyStackTraceHead, align 8
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tail call void @_ZdlPv(ptr %this)
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ret void
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}
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; CHECK-LABEL: _ZN4llvm21PrettyStackTraceEntryD0Ev:
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; CHECK: addis [[REG1:[0-9]+]], 2, _ZL20PrettyStackTraceHead@got@tlsld@ha
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; CHECK: addi 3, [[REG1]], _ZL20PrettyStackTraceHead@got@tlsld@l
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; CHECK: bl __tls_get_addr(_ZL20PrettyStackTraceHead@tlsld)
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; CHECK: addis [[REG2:[0-9]+]], 3, _ZL20PrettyStackTraceHead@dtprel@ha
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; CHECK: ld {{[0-9]+}}, _ZL20PrettyStackTraceHead@dtprel@l([[REG2]])
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; CHECK: std {{[0-9]+}}, _ZL20PrettyStackTraceHead@dtprel@l([[REG2]])
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