[llvm-commits] [llvm] r171466 - in /llvm/trunk: lib/Target/X86/X86InstrArithmetic.td test/CodeGen/X86/early-ifcvt.ll

[Eric Christopher]

Was this with a bootstrap build or something? How'd it break
FixIt/fixit-errors.c?

-eric


On Thu, Jan 3, 2013 at 12:18 AM, Michael Gottesman <mgottesman at apple.com>wrote:

> Author: mgottesman
> Date: Thu Jan  3 02:18:30 2013
> New Revision: 171466
>
> URL: http://llvm.org/viewvc/llvm-project?rev=171466&view=rev
> Log:
> Revert "Mark DIV/IDIV instructions hasSideEffects=1 because they can trap
> when dividing by 0. This is needed to keep early if conversion from moving
> them across basic blocks."
>
> This reverts commit r171461 since it breaks the following tests:
>
> Clang :: Analysis/outofbound-notwork.c
> Clang :: Analysis/string-fail.c
> Clang :: CXX/basic/basic.lookup/basic.lookup.qual/p6-0x.cpp
> Clang :: CXX/basic/basic.lookup/basic.lookup.unqual/p15.cpp
> Clang :: CXX/dcl.dcl/dcl.spec/dcl.fct.spec/p4.cpp
> Clang :: CXX/dcl.dcl/dcl.spec/dcl.stc/p10.cpp
> Clang :: CXX/temp/temp.param/p14.cpp
> Clang :: CXX/temp/temp.res/temp.dep.res/temp.point/p1.cpp
> Clang :: CodeGen/2009-02-13-zerosize-union-field-ppc.c
> Clang :: CodeGen/blocks-2.c
> Clang :: CodeGen/libcalls-d.c
> Clang :: CodeGen/libcalls-ld.c
> Clang :: CodeGenCXX/conversion-function.cpp
> Clang :: CodeGenCXX/debug-info-limit-type.cpp
> Clang :: CodeGenCXX/inheriting-constructor.cpp
> Clang :: FixIt/fixit-errors.c
> Clang :: FixIt/fixit-pmem.cpp
> Clang :: Modules/namespaces.cpp
> Clang :: PCH/changed-files.c
> Clang :: PCH/pr4489.c
> Clang :: PCH/source-manager-stack.c
> Clang :: Parser/cxx-ambig-decl-expr-xfail.cpp
> Clang :: SemaCXX/switch-implicit-fallthrough-cxx98.cpp
> Clang :: SemaTemplate/instantiate-function-1.mm
>
> Modified:
>     llvm/trunk/lib/Target/X86/X86InstrArithmetic.td
>     llvm/trunk/test/CodeGen/X86/early-ifcvt.ll
>
> Modified: llvm/trunk/lib/Target/X86/X86InstrArithmetic.td
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrArithmetic.td?rev=171466&r1=171465&r2=171466&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Target/X86/X86InstrArithmetic.td (original)
> +++ llvm/trunk/lib/Target/X86/X86InstrArithmetic.td Thu Jan  3 02:18:30
> 2013
> @@ -266,7 +266,7 @@
>
>
>  // unsigned division/remainder
> -let hasSideEffects = 1 in { // so that we don't speculatively execute
> +let hasSideEffects = 0 in {
>  let Defs = [AL,EFLAGS,AX], Uses = [AX] in
>  def DIV8r  : I<0xF6, MRM6r, (outs),  (ins GR8:$src),    // AX/r8 = AL,AH
>                 "div{b}\t$src", [], IIC_DIV8_REG>;
>
> Modified: llvm/trunk/test/CodeGen/X86/early-ifcvt.ll
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/early-ifcvt.ll?rev=171466&r1=171465&r2=171466&view=diff
>
> ==============================================================================
> --- llvm/trunk/test/CodeGen/X86/early-ifcvt.ll (original)
> +++ llvm/trunk/test/CodeGen/X86/early-ifcvt.ll Thu Jan  3 02:18:30 2013
> @@ -142,35 +142,3 @@
>  }
>
>  declare void @BZ2_bz__AssertH__fail()
> -
> -
> -; Make sure we don't speculate on div/idiv instructions
> -; CHECK: test_idiv
> -; CHECK-NOT: cmov
> -define i32 @test_idiv(i32 %a, i32 %b) nounwind uwtable readnone ssp {
> -  %1 = icmp eq i32 %b, 0
> -  br i1 %1, label %4, label %2
> -
> -; <label>:2                                       ; preds = %0
> -  %3 = sdiv i32 %a, %b
> -  br label %4
> -
> -; <label>:4                                       ; preds = %0, %2
> -  %5 = phi i32 [ %3, %2 ], [ %a, %0 ]
> -  ret i32 %5
> -}
> -
> -; CHECK: test_div
> -; CHECK-NOT: cmov
> -define i32 @test_div(i32 %a, i32 %b) nounwind uwtable readnone ssp {
> -  %1 = icmp eq i32 %b, 0
> -  br i1 %1, label %4, label %2
> -
> -; <label>:2                                       ; preds = %0
> -  %3 = udiv i32 %a, %b
> -  br label %4
> -
> -; <label>:4                                       ; preds = %0, %2
> -  %5 = phi i32 [ %3, %2 ], [ %a, %0 ]
> -  ret i32 %5
> -}
>
>
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