Commit Graph

107123 Commits

Author SHA1 Message Date
Josh Klontz
f19807db70 X86AsmPrinter MCJIT MSVC bug fix.
Summary:
This bug was introduced in r213006 which makes an assumption that MCSection is COFF for Windows MSVC. This assumption is broken for MCJIT users where ELF is used instead [1]. The fix is to change the MCSection cast to a dyn_cast.

[1] http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-December/068407.html.

Reviewers: majnemer

Reviewed By: majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D4872

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216173 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 12:55:27 +00:00
Oliver Stannard
760a46522a [ARM] Enable DP copy, load and store instructions for FPv4-SP
The FPv4-SP floating-point unit is generally referred to as
single-precision only, but it does have double-precision registers and
load, store and GPR<->DPR move instructions which operate on them.
This patch enables the use of these registers, the main advantage of
which is that we now comply with the AAPCS-VFP calling convention.
This partially reverts r209650, which added some AAPCS-VFP support,
but did not handle return values or alignment of double arguments in
registers.

This patch also adds tests for Thumb2 code generation for
floating-point instructions and intrinsics, which previously only
existed for ARM.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216172 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 12:50:31 +00:00
Rafael Espindola
fc4bdcdc87 Sort declarations.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216171 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 12:39:07 +00:00
Benjamin Kramer
67e5178cef Make format_object_base's destructor protected and non-virtual.
It's not meant to be used with operator delete and this avoids emitting virtual
dtors for every derived format object.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216170 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 11:22:05 +00:00
Erik Verbruggen
0edc5e8391 Reassociate x + -0.1234 * y into x - 0.1234 * y
This does not require -ffast-math, and it gives CSE/GVN more options to
eliminate duplicate expressions in, e.g.:

  return ((x + 0.1234 * y) * (x - 0.1234 * y));

Differential Revision: http://reviews.llvm.org/D4904



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216169 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 10:45:30 +00:00
Benjamin Kramer
f11ac42d01 X86: Turn redundant if into an assertion.
While there remove noop casts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216168 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 10:31:37 +00:00
Robert Khasanov
fec1abaeab [x86] Added _addcarry_ and _subborrow_ intrinsics
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216164 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 09:43:43 +00:00
Robert Khasanov
375a68ca15 [x86] SMAP: added HasSMAP attribute for CLAC/STAC, corrected attributes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216163 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 09:34:12 +00:00
Robert Khasanov
10dacc4b52 [x86] Broadwell: ADOX/ADCX. Added _addcarryx_u{32|64} intrinsics to LLVM.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216162 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 09:27:00 +00:00
Robert Khasanov
3a34f5e115 [x86] Enable Broadwell target.
Added FeatureSMAP.

Broadwell ISA includes Haswell ISA + ADX + RDSEED + SMAP


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216161 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 09:16:12 +00:00
Zinovy Nis
164cd0161e [INDVARS] Extend using of widening of induction variables for the cases of "sub nsw" and "mul nsw" instructions.
Currently only "add nsw" are widened. This patch eliminates tons of "sext" instructions for 64 bit code (and the corresponding target code) in cases like:

int N = 100;
float **A;

void foo(int x0, int x1)
{
        float * A_cur = &A[0][0];
        float * A_next = &A[1][0];
        for(int x = x0; x < x1; ++x).
        {
          // Currently only [x+N] case is widened. Others 2 cases lead to sext.
          // This patch fixes it, so all 3 cases do not need sext.
          const float div = A_cur[x + N] + A_cur[x - N] + A_cur[x * N];
          A_next[x] = div;
        }
}
...
> clang++ test.cpp -march=core-avx2 -Ofast  -fno-unroll-loops -fno-tree-vectorize -S -o -

Differential Revision: http://reviews.llvm.org/D4695



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216160 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 08:25:45 +00:00
Elena Demikhovsky
6623af7892 IntelJITEventListener updates to fix breaks by recent changes to EngineBuilder and DIContext.
By Arch Robison.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216159 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 07:01:55 +00:00
Craig Topper
431bdfc4c1 Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216158 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 05:55:13 +00:00
David Majnemer
e234f93b3e InstCombine: Fold ((A | B) & C1) ^ (B & C2) -> (A & C1) ^ B if C1^C2=-1
Adapted from a patch by Richard Smith, test-case written by me.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216157 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 05:14:48 +00:00
Craig Topper
e88b796285 Remove custom implementations of max/min in StringRef that was originally added to work an old gcc bug. I believe its been fixed by now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216156 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 04:31:10 +00:00
Eric Fiselier
e996e5e826 add self to credits
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216155 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 04:27:11 +00:00
Jiangning Liu
82f1a8cc09 Fix a bug around truncating vector in const prop.
In constant folding stage, "TRUNC" can't handle vector data type.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216149 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 02:12:35 +00:00
Jiangning Liu
150cef218f Revert r216066, "Optimize ZERO_EXTEND and SIGN_EXTEND in both SelectionDAG Builder and type".
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216147 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 01:59:30 +00:00
Quentin Colombet
e817bdd304 [PeepholeOptimizer] Take advantage of the isInsertSubreg property in the
advanced copy optimization.

This is the final step patch toward transforming:
udiv    r0, r0, r2
udiv    r1, r1, r3
vmov.32 d16[0], r0
vmov.32 d16[1], r1
vmov    r0, r1, d16
bx      lr

into:
udiv    r0, r0, r2
udiv    r1, r1, r3
bx      lr

Indeed, thanks to this patch, this optimization is able to look through
vmov.32 d16[0], r0
vmov.32 d16[1], r1

and is able to rewrite the following sequence:
vmov.32 d16[0], r0
vmov.32 d16[1], r1
vmov    r0, r1, d16

into simple generic GPR copies that the coalescer managed to remove.

<rdar://problem/12702965>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216144 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 00:19:16 +00:00
Quentin Colombet
7599acc2af [ARM] Mark VSETLNi32 with the InsertSubreg property and implement the related
target hook.

This patch teaches the compiler that:
dX = VSETLNi32 dY, rZ, imm
is the same as:
dX = INSERT_SUBREG dY, rZ, translateImmToSubIdx(imm)

<rdar://problem/12702965>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216143 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 00:10:52 +00:00
James Molloy
824431f680 [LoopVectorize] Up the maximum unroll factor to 4 for AArch64
Only for Cortex-A57 and Cyclone for now, where it has shown wins.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216141 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-21 00:02:51 +00:00
James Molloy
bb819edc1f [LoopVectorizer] Limit unroll factor in the presence of nested reductions.
If we have a scalar reduction, we can increase the critical path length if the loop we're unrolling is inside another loop. Limit, by default to 2, so the critical path only gets increased by one reduction operation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216140 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 23:53:52 +00:00
Quentin Colombet
0d15213307 Add isInsertSubreg property.
This patch adds a new property: isInsertSubreg and the related target hooks:
TargetIntrInfo::getInsertSubregInputs and
TargetInstrInfo::getInsertSubregLikeInputs to specify that a target specific
instruction is a (kind of) INSERT_SUBREG.

The approach is similar to r215394.

<rdar://problem/12702965>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216139 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 23:49:36 +00:00
Jonathan Roelofs
506ed4d4a5 Lower thumbv4t & thumbv5 lo->lo copies through a push-pop sequence
On pre-v6 hardware, 'MOV lo, lo' gives undefined results, so such copies need to
be avoided. This patch trades simplicity for implementation time at the expense
of performance... As they say: correctness first, then performance.

See http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-August/075998.html for a few
ideas on how to make this better.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216138 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 23:38:50 +00:00
Quentin Colombet
400bc218f8 Mention the right target hook in the comment on isExtractSubreg property.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216137 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 23:25:28 +00:00
Quentin Colombet
8ccce6b8fe [PeepholeOptimizer] Take advantage of the isExtractSubreg property in the
advanced copy optimization.

This patch is a step toward transforming:
udiv	r0, r0, r2
udiv	r1, r1, r3
vmov.32	d16[0], r0
vmov.32	d16[1], r1
vmov	r0, r1, d16
bx	lr

into:
udiv	r0, r0, r2
udiv	r1, r1, r3
bx	lr

Indeed, thanks to this patch, this optimization is able to look through
vmov r0, r1, d16
but it does not understand yet
vmov.32 d16[0], r0
vmov.32 d16[1], r1

Comming patches will fix that and update the related test case.

<rdar://problem/12702965>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216136 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 23:13:02 +00:00
Yi Jiang
ee1b45f2a2 New InstCombine pattern: (icmp ult/ule (A + C1), C3) | (icmp ult/ule (A + C2), C3) to (icmp ult/ule ((A & ~(C1 ^ C2)) + max(C1, C2)), C3) under certain condition
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216135 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 22:55:40 +00:00
Alexey Samsonov
9ec471a5d8 Don't allow MCStreamer::EmitIntValue to output 0-byte integers.
It makes no sense and can hide bugs. In particular, it lead
to left shift by 64 bits, which is an undefined behavior,
properly reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216134 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 22:46:38 +00:00
Quentin Colombet
d28e4c1735 [ARM] Mark VMOVRRD with the ExtractSubreg property and implement the related
target hook.

This patch teaches the compiler that:
rX, rY = VMOVRRD dZ
is the same as:
rX = EXTRACT_SUBREG dZ, ssub_0
rY = EXTRACT_SUBREG dZ, ssub_1

<rdar://problem/12702965>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216132 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 22:16:19 +00:00
Alexey Samsonov
d1e3fcf347 Fix undefined behavior (left shift of negative value) in SystemZ backend.
This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216131 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 21:56:43 +00:00
Quentin Colombet
dac67649f2 Add isExtractSubreg property.
This patch adds a new property: isExtractSubreg and the related target hooks:
TargetIntrInfo::getExtractSubregInputs and
TargetInstrInfo::getExtractSubregLikeInputs to specify that a target specific
instruction is a (kind of) EXTRACT_SUBREG.

The approach is similar to r215394.

<rdar://problem/12702965>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216130 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 21:51:26 +00:00
Alexey Samsonov
fa210acc3b Fix null reference creation in SelectionDAG constructor.
Store TargetSelectionDAGInfo as a pointer instead of a reference:
getSelectionDAGInfo() may not be implemented for certain backends
(e.g. it's not currently implemented for R600).

This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216129 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 21:40:15 +00:00
Alexey Samsonov
145d28e73b Fix undefined behavior (left shift of negative value) in Hexagon backend.
This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216125 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 21:22:03 +00:00
Alexey Samsonov
a046b4149c Cleanup: Delete seemingly unused reference to MachineDominatorTree from ScheduleDAGInstrs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216124 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 20:57:26 +00:00
Sanjay Patel
89305e5345 Don't prevent a vselect of constants from becoming a single load (PR20648).
Fix for PR20648 - http://llvm.org/bugs/show_bug.cgi?id=20648

This patch checks the operands of a vselect to see if all values are constants.
If yes, bail out of any further attempts to create a blend or shuffle because
SelectionDAGLegalize knows how to turn this kind of vselect into a single load.

This already happens for machines without SSE4.1, so the added checks just send
more targets down that path.

Differential Revision: http://reviews.llvm.org/D4934


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216121 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 20:34:56 +00:00
Duncan P. N. Exon Smith
4641d5dbdf X86: Add missing triples from r216119
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216120 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 19:58:59 +00:00
Duncan P. N. Exon Smith
5012f1db20 X86: Align the stack on word boundaries in LowerFormalArguments()
The goal of the patch is to implement section 3.2.3 of the AMD64 ABI
correctly.  The controlling sentence is, "The size of each argument gets
rounded up to eightbytes.  Therefore the stack will always be eightbyte
aligned." The equivalent sentence in the i386 ABI page 37 says, "At all
times, the stack pointer should point to a word-aligned area."  For both
architectures, the stack pointer is not being rounded up to the nearest
eightbyte or word between the last normal argument and the first
variadic argument.

Patch by Thomas Jablin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216119 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 19:40:59 +00:00
Alexey Samsonov
ada5f2a2c7 Fix null reference creation in ScheduleDAGInstrs constructor call.
Both MachineLoopInfo and MachineDominatorTree may be null in ScheduleDAGMI
constructor call. It is undefined behavior to take references to these values.

This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216118 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 19:36:05 +00:00
Keno Fischer
4b1cddbaf0 Do not insert a tail call when returning multiple values on X86
Summary: This fixes http://llvm.org/bugs/show_bug.cgi?id=19530.
The problem is that X86ISelLowering erroneously thought the third call
was eligible for tail call elimination.
It would have been if it's return value was actually the one returned
by the calling function, but here that is not the case and
additional values are being returned.

Test Plan: Test case from the original bug report is included.

Reviewers: rafael

Reviewed By: rafael

Subscribers: rafael, llvm-commits

Differential Revision: http://reviews.llvm.org/D4968

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216117 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 19:00:37 +00:00
Alexey Samsonov
242320399f Fix undefined behavior (left shift by 64 bits) in ScaledNumber::toString().
This bug is reported by UBSan.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216116 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 18:30:07 +00:00
Sanjay Patel
3deb3e32b2 critical-anti-dependency breaker: don't use reg def info from kill insts (PR20308)
In PR20308 ( http://llvm.org/bugs/show_bug.cgi?id=20308 ), the critical-anti-dependency breaker
caused a miscompile because it broke a WAR hazard using a register that it thinks is available
based on info from a kill inst. Until PR18663 is solved, we shouldn't use any def/use info from
a kill because they are really just nops.

This patch adds guard checks for kills around calls to ScanInstruction() where the DefIndices
array is set. For good measure, add an assert in ScanInstruction() so we don't hit this bug again.

The test case is a reduced version of the code from the bug report.

Differential Revision: http://reviews.llvm.org/D4977



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216114 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 18:03:00 +00:00
Quentin Colombet
dcd3cbea54 [PeepholeOptimizer] Refactor the advanced copy optimization to take advantage of
the isRegSequence property.

This is a follow-up of r215394 and r215404, which respectively introduces the
isRegSequence property and uses it for ARM.

Thanks to the property introduced by the previous commits, this patch is able
to optimize the following sequence:
vmov	d0, r2, r3
vmov	d1, r0, r1
vmov	r0, s0
vmov	r1, s2
udiv	r0, r1, r0
vmov	r1, s1
vmov	r2, s3
udiv	r1, r2, r1
vmov.32	d16[0], r0
vmov.32	d16[1], r1
vmov	r0, r1, d16
bx	lr

into:
udiv	r0, r0, r2
udiv	r1, r1, r3
vmov.32	d16[0], r0
vmov.32	d16[1], r1
vmov	r0, r1, d16
bx	lr

This patch refactors how the copy optimizations are done in the peephole
optimizer. Prior to this patch, we had one copy-related optimization that
replaced a copy or bitcast by a generic, more suitable (in terms of register
file), copy.

With this patch, the peephole optimizer features two copy-related optimizations:
1. One for rewriting generic copies to generic copies:
PeepholeOptimizer::optimizeCoalescableCopy.
2. One for replacing non-generic copies with generic copies:
PeepholeOptimizer::optimizeUncoalescableCopy.

The goals of these two optimizations are slightly different: one rewrite the
operand of the instruction (#1), the other kills off the non-generic instruction
and replace it by a (sequence of) generic instruction(s).

Both optimizations rely on the ValueTracker introduced in r212100.

The ValueTracker has been refactored to use the information from the
TargetInstrInfo for non-generic instruction. As part of the refactoring, we
switched the tracking from the index of the definition to the actual register
(virtual or physical). This one change is to provide better consistency with
register related APIs and to ease the use of the TargetInstrInfo.

Moreover, this patch introduces a new helper class CopyRewriter used to ease the
rewriting of generic copies (i.e., #1).

Finally, this patch adds a dead code elimination pass right after the peephole
optimizer to get rid of dead code that may appear after rewriting.

This is related to <rdar://problem/12702965>.

Review: http://reviews.llvm.org/D4874


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216088 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 17:41:48 +00:00
Andrew Trick
e18eb616a8 Tweak CFGPrinter to wrap very long names.
I added wrapping to the CFGPrinter a while back so the -view-cfg
output is actually viewable. I've since enountered very long mangled
names with the same problem, so I'm slightly tweaking this code to
work in that case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216087 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 17:38:12 +00:00
Rafael Espindola
1506856c3b Remove unused field.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216086 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 17:33:44 +00:00
Juergen Ributzka
5273295751 [FastISel][AArch64] Don't fold the sign-/zero-extend from i1 into the compare.
This fixes a bug I introduced in a previous commit (r216033). Sign-/Zero-
extension from i1 cannot be folded into the ADDS/SUBS instructions. Instead both
operands have to be sign-/zero-extended with separate instructions.

Related to <rdar://problem/17913111>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216073 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 16:34:15 +00:00
Rafael Espindola
4b67b5a958 Quick fix for an use after free.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216071 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 15:19:37 +00:00
Dan Liew
0ea6d4421c Add note to LangRef about how function arguments can be unnamed and
how this affects the numbering of unnamed temporaries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216070 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 15:06:30 +00:00
Aaron Ballman
a2bec69360 Silencing a -Wcast-qual warning. NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216068 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 12:54:13 +00:00
Aaron Ballman
0e9c68e6bc Silencing an MSVC C4334 warning ('<<' : result of 32-bit shift implicitly converted to 64 bits (was 64-bit shift intended?)). NFC.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216067 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 12:14:35 +00:00
Jiangning Liu
e04455d72b Optimize ZERO_EXTEND and SIGN_EXTEND in both SelectionDAG Builder and type
legalization stage. With those two optimizations, fewer signed/zero extension
instructions can be inserted, and then we can expose more opportunities to
Machine CSE pass in back-end.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216066 91177308-0d34-0410-b5e6-96231b3b80d8
2014-08-20 12:05:15 +00:00