[LLVMbugs] [Bug 20692] New: Prefetch not supported

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Aug 18 00:30:46 PDT 2014


            Bug ID: 20692
           Summary: Prefetch not supported
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

; ModuleID = 'p.c' (aka. "void test(char *x) { __builtin_prefetch(x, 1); }")
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64--linux-gnu"

; Function Attrs: nounwind
define void @test(i8* nocapture %x) {
  tail call void @llvm.prefetch(i8* %x, i32 1, i32 3, i32 1)
  ret void

; Function Attrs: nounwind
declare void @llvm.prefetch(i8* nocapture, i32, i32, i32) nounwind

If you run that, you get:
nlewycky at ducttape:~$ llc p.ll
LLVM ERROR: Cannot select: 0x320f110: ch = Prefetch 0x31dd410, 0x320edf8,
0x320ef00, 0x320f008, 0x320ef00<ST1[%x]> [ORD=2] [ID=5]
  0x320edf8: i64,ch = CopyFromReg 0x31dd410, 0x320ecf0 [ORD=1] [ID=4]
    0x320ecf0: i64 = Register %vreg0 [ID=1]
  0x320ef00: i32 = Constant<1> [ID=2]
  0x320f008: i32 = Constant<3> [ID=3]
  0x320ef00: i32 = Constant<1> [ID=2]
In function: test

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