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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."

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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

llvm-svn: 171466
This commit is contained in:
Michael Gottesman 2013-01-03 08:18:30 +00:00
parent a67b835abe
commit 5f81e1c2d0
2 changed files with 1 additions and 33 deletions
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2
lib/Target/X86/X86InstrArithmetic.td
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@ -266,7 +266,7 @@ def IMUL64rmi8 : RIi8<0x6B, MRMSrcMem, // GR64 = [mem64]*I8
// 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>;

32
test/CodeGen/X86/early-ifcvt.ll
View File

@ -142,35 +142,3 @@ save_state_and_return:
}
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
}