2016-08-04 02:17:35 +08:00
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; RUN: llc -verify-machineinstrs <%s | FileCheck %s
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[PR27390] [CodeGen] Reject indexed loads in CombinerDAG.
visitAND, when folding and (load) forgets to check which output of
an indexed load is involved, happily folding the updated address
output on the following testcase:
target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-unknown-linux-gnu"
%typ = type { i32, i32 }
define signext i32 @_Z8access_pP1Tc(%typ* %p, i8 zeroext %type) {
%b = getelementptr inbounds %typ, %typ* %p, i64 0, i32 1
%1 = load i32, i32* %b, align 4
%2 = ptrtoint i32* %b to i64
%3 = and i64 %2, -35184372088833
%4 = inttoptr i64 %3 to i32*
%_msld = load i32, i32* %4, align 4
%zzz = add i32 %1, %_msld
ret i32 %zzz
}
Fix this by checking ResNo.
I've found a few more places that currently neglect to check for
indexed load, and tightened them up as well, but I don't have test
cases for them. In fact, they might not be triggerable at all,
at least with current targets. Still, better safe than sorry.
Differential Revision: http://reviews.llvm.org/D19202
llvm-svn: 267420
2016-04-25 23:43:44 +08:00
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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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; PR27390 crasher
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%typ = type { i32, i32 }
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; On release builds, it doesn't crash, spewing nonsense instead.
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; To make sure it works, check that and is still alive.
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; CHECK: and
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; Also, in release, it emits a COPY from a 32-bit register to
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; a 64-bit register, which happens to be emitted as cror [!]
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; by the confused CodeGen. Just to be sure, check there isn't one.
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; CHECK-NOT: cror
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; Function Attrs: uwtable
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define signext i32 @_Z8access_pP1Tc(%typ* %p, i8 zeroext %type) {
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%b = getelementptr inbounds %typ, %typ* %p, i64 0, i32 1
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%1 = load i32, i32* %b, align 4
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%2 = ptrtoint i32* %b to i64
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%3 = and i64 %2, -35184372088833
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%4 = inttoptr i64 %3 to i32*
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%_msld = load i32, i32* %4, align 4
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%zzz = add i32 %1, %_msld
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ret i32 %zzz
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}
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