aboutsummaryrefslogtreecommitdiff
path: root/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
AgeCommit message (Collapse)Author
2006-06-28Mark these two classes as hidden, shrinking libllbmgcc.dylib by 25KChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28970 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-12Start on my todo listAndrew Lenharth
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28752 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-31visitVBinOp: Can't fold divide by zero!Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28584 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-27Fix a nasty dag combiner bug that caused nondeterminstic crashes (MY FAVORITE!):Chris Lattner
SimplifySelectOps would eliminate a Select, delete it, then return true. The clients would see that it did something and return null. The top level would see a null return, and decide that nothing happened, proceeding to process the node in other ways: boom. The fix is simple: clients of SimplifySelectOps should return the select node itself. In order to catch really obnoxious boogs like this in the future, add an assert that nodes are not deleted. We do this by checking for a sentry node type that the SDNode dtor sets when a node is destroyed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28514 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-16Move this code to a common placeAndrew Lenharth
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28329 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-12Comment out dead variablesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28252 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-12Two simplifications for token factor nodes: simplify tf(x,x) -> x.Chris Lattner
simplify tf(x,y,y,z) -> tf(x,y,z). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28233 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-09Debugging infoEvan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28200 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-08Make the case I just checked in stronger. Now we compile this:Chris Lattner
short test2(short X, short x) { int Y = (short)(X+x); return Y >> 1; } to: _test2: add r2, r3, r4 extsh r2, r2 srawi r3, r2, 1 blr instead of: _test2: add r2, r3, r4 extsh r2, r2 srwi r2, r2, 1 extsh r3, r2 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28175 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-08Implement and_sext.ll:test3, generating:Chris Lattner
_test4: srawi r3, r3, 16 blr instead of: _test4: srwi r2, r3, 16 extsh r3, r2 blr for: short test4(unsigned X) { return (X >> 16); } git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28174 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-08Compile this:Chris Lattner
short test4(unsigned X) { return (X >> 16); } to: _test4: movl 4(%esp), %eax sarl $16, %eax ret instead of: _test4: movl $-65536, %eax andl 4(%esp), %eax sarl $16, %eax ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28171 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-08Fix PR772Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28161 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-06Simplify some code, add a couple minor missed foldsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28152 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-06remove cases handled elsewhereChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28150 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-06Use the new TargetLowering::ComputeNumSignBits method to eliminateChris Lattner
sign_extend_inreg operations. Though ComputeNumSignBits is still rudimentary, this is enough to compile this: short test(short X, short x) { int Y = X+x; return (Y >> 1); } short test2(short X, short x) { int Y = (short)(X+x); return Y >> 1; } into: _test: add r2, r3, r4 srawi r3, r2, 1 blr _test2: add r2, r3, r4 extsh r2, r2 srawi r3, r2, 1 blr instead of: _test: add r2, r3, r4 srawi r2, r2, 1 extsh r3, r2 blr _test2: add r2, r3, r4 extsh r2, r2 srawi r2, r2, 1 extsh r3, r2 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28146 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Fold trunc(any_ext). This gives stuff like:Chris Lattner
27,28c27 < movzwl %di, %edi < movl %edi, %ebx --- > movw %di, %bx git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28137 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Shrink shifts when possible.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28136 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Fold (fpext (load x)) -> (extload x)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28130 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Fold some common code.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28124 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Implement:Chris Lattner
// fold (and (sext x), (sext y)) -> (sext (and x, y)) // fold (or (sext x), (sext y)) -> (sext (or x, y)) // fold (xor (sext x), (sext y)) -> (sext (xor x, y)) // fold (and (aext x), (aext y)) -> (aext (and x, y)) // fold (or (aext x), (aext y)) -> (aext (or x, y)) // fold (xor (aext x), (aext y)) -> (aext (xor x, y)) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28123 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Pull and through and/or/xor. This compiles some bitfield code to:Chris Lattner
mov EAX, DWORD PTR [ESP + 4] mov ECX, DWORD PTR [EAX] mov EDX, ECX add EDX, EDX or EDX, ECX and EDX, -2147483648 and ECX, 2147483647 or EDX, ECX mov DWORD PTR [EAX], EDX ret instead of: sub ESP, 4 mov DWORD PTR [ESP], ESI mov EAX, DWORD PTR [ESP + 8] mov ECX, DWORD PTR [EAX] mov EDX, ECX add EDX, EDX mov ESI, ECX and ESI, -2147483648 and EDX, -2147483648 or EDX, ESI and ECX, 2147483647 or EDX, ECX mov DWORD PTR [EAX], EDX mov ESI, DWORD PTR [ESP] add ESP, 4 ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28122 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Implement a variety of simplifications for ANY_EXTEND.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28121 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-05Factor some code, add these transformations:Chris Lattner
// fold (and (trunc x), (trunc y)) -> (trunc (and x, y)) // fold (or (trunc x), (trunc y)) -> (trunc (or x, y)) // fold (xor (trunc x), (trunc y)) -> (trunc (xor x, y)) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28120 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-28Remove a bogus transformation. This fixes ↵Chris Lattner
SingleSource/UnitTests/2006-01-23-InitializedBitField.c with some changes I have to the new CFE. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28022 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-21Fix a couple more memory issuesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27930 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-20Fix a really subtle and obnoxious memory bug that caused issues with anChris Lattner
llvm-gcc4 boostrap. Whenever a node is deleted by the dag combiner, it *must* be returned by the visit function, or the dag combiner will not know that the node has been processed (and will, e.g., send it to the target dag combine xforms). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27922 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-20Turn a VAND into a VECTOR_SHUFFLE is applicable.Evan Cheng
DAG combiner can turn a VAND V, <-1, 0, -1, -1>, i.e. vector clear elements, into a vector shuffle with a zero vector. It only does so when TLI tells it the xform is profitable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27874 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-08Canonicalize vvector_shuffle(x,x) -> vvector_shuffle(x,undef) to enable patternsChris Lattner
to match again :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27533 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-08Codegen shufflevector as VVECTOR_SHUFFLEChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27529 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-061. If both vector operands of a vector_shuffle are undef, turn it into an undef.Evan Cheng
2. A shuffle mask element can also be an undef. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27472 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-04Do not create ZEXTLOAD's unless we are before legalize or the operation isChris Lattner
legal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27402 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-03Add a missing check, this fixes UnitTests/Vector/sumarray.cChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27375 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-03Add a missing check, which broke a bunch of vector tests.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27374 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-03back this outAndrew Lenharth
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27367 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-02This should be a win of every archAndrew Lenharth
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27364 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-02Add a little dag combine to compile this:Chris Lattner
int %AreSecondAndThirdElementsBothNegative(<4 x float>* %in) { entry: %tmp1 = load <4 x float>* %in ; <<4 x float>> [#uses=1] %tmp = tail call int %llvm.ppc.altivec.vcmpgefp.p( int 1, <4 x float> < float 0x7FF8000000000000, float 0.000000e+00, float 0.000000e+00, float 0x7FF8000000000000 >, <4 x float> %tmp1 ) ; <int> [#uses=1] %tmp = seteq int %tmp, 0 ; <bool> [#uses=1] %tmp3 = cast bool %tmp to int ; <int> [#uses=1] ret int %tmp3 } into this: _AreSecondAndThirdElementsBothNegative: mfspr r2, 256 oris r4, r2, 49152 mtspr 256, r4 li r4, lo16(LCPI1_0) lis r5, ha16(LCPI1_0) lvx v0, 0, r3 lvx v1, r5, r4 vcmpgefp. v0, v1, v0 mfcr r3, 2 rlwinm r3, r3, 27, 31, 31 mtspr 256, r2 blr instead of this: _AreSecondAndThirdElementsBothNegative: mfspr r2, 256 oris r4, r2, 49152 mtspr 256, r4 li r4, lo16(LCPI1_0) lis r5, ha16(LCPI1_0) lvx v0, 0, r3 lvx v1, r5, r4 vcmpgefp. v0, v1, v0 mfcr r3, 2 rlwinm r3, r3, 27, 31, 31 xori r3, r3, 1 cntlzw r3, r3 srwi r3, r3, 5 mtspr 256, r2 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27356 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-02Constant fold all of the vector binops. This allows us to compile this:Chris Lattner
"vector unsigned char mergeLowHigh = (vector unsigned char) ( 8, 9, 10, 11, 16, 17, 18, 19, 12, 13, 14, 15, 20, 21, 22, 23 ); vector unsigned char mergeHighLow = vec_xor( mergeLowHigh, vec_splat_u8(8));" aka: void %test2(<16 x sbyte>* %P) { store <16 x sbyte> cast (<4 x int> xor (<4 x int> cast (<16 x ubyte> < ubyte 8, ubyte 9, ubyte 10, ubyte 11, ubyte 16, ubyte 17, ubyte 18, ubyte 19, ubyte 12, ubyte 13, ubyte 14, ubyte 15, ubyte 20, ubyte 21, ubyte 22, ubyte 23 > to <4 x int>), <4 x int> cast (<16 x sbyte> < sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8, sbyte 8 > to <4 x int>)) to <16 x sbyte>), <16 x sbyte> * %P ret void } into this: _test2: mfspr r2, 256 oris r4, r2, 32768 mtspr 256, r4 li r4, lo16(LCPI2_0) lis r5, ha16(LCPI2_0) lvx v0, r5, r4 stvx v0, 0, r3 mtspr 256, r2 blr instead of this: _test2: mfspr r2, 256 oris r4, r2, 49152 mtspr 256, r4 li r4, lo16(LCPI2_0) lis r5, ha16(LCPI2_0) vspltisb v0, 8 lvx v1, r5, r4 vxor v0, v1, v0 stvx v0, 0, r3 mtspr 256, r2 blr ... which occurs here: http://developer.apple.com/hardware/ve/calcspeed.html git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27343 91177308-0d34-0410-b5e6-96231b3b80d8
2006-04-02Implement constant folding of bit_convert of arbitrary constant ↵Chris Lattner
vbuild_vector nodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27341 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-31Delete identity shuffles, implementing ↵Chris Lattner
CodeGen/Generic/vector-identity-shuffle.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27317 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-31Remove dead *extloads. This allows us to codegen vector.ll:test_extract_eltChris Lattner
to: test_extract_elt: alloc r3 = ar.pfs,0,1,0,0 adds r8 = 12, r32 ;; ldfs f8 = [r8] mov ar.pfs = r3 br.ret.sptk.many rp instead of: test_extract_elt: alloc r3 = ar.pfs,0,1,0,0 adds r8 = 28, r32 adds r9 = 24, r32 adds r10 = 20, r32 adds r11 = 16, r32 ;; ldfs f6 = [r8] ;; ldfs f6 = [r9] adds r8 = 12, r32 adds r9 = 8, r32 adds r14 = 4, r32 ;; ldfs f6 = [r10] ;; ldfs f6 = [r11] ldfs f8 = [r8] ;; ldfs f6 = [r9] ;; ldfs f6 = [r14] ;; ldfs f6 = [r32] mov ar.pfs = r3 br.ret.sptk.many rp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27297 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-31Delete dead loads in the dag. This allows us to compileChris Lattner
vector.ll:test_extract_elt2 into: _test_extract_elt2: lfd f1, 32(r3) blr instead of: _test_extract_elt2: lfd f0, 56(r3) lfd f0, 48(r3) lfd f0, 40(r3) lfd f1, 32(r3) lfd f0, 24(r3) lfd f0, 16(r3) lfd f0, 8(r3) lfd f0, 0(r3) blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27296 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-28When building a VVECTOR_SHUFFLE node from extract_element operations, makeChris Lattner
sure to build it as SHUFFLE(X, undef, mask), not SHUFFLE(X, X, mask). The later is not canonical form, and prevents the PPC splat pattern from matching. For a particular splat, we go from generating this: li r10, lo16(LCPI1_0) lis r11, ha16(LCPI1_0) lvx v3, r11, r10 vperm v3, v2, v2, v3 to generating: vspltw v3, v2, 3 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27236 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-28Canonicalize VECTOR_SHUFFLE(X, X, Y) -> VECTOR_SHUFFLE(X,undef,Y')Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27235 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-28Turn a series of extract_element's feeding a build_vector into aChris Lattner
vector_shuffle node. For this: void test(__m128 *res, __m128 *A, __m128 *B) { *res = _mm_unpacklo_ps(*A, *B); } we now produce this code: _test: movl 8(%esp), %eax movaps (%eax), %xmm0 movl 12(%esp), %eax unpcklps (%eax), %xmm0 movl 4(%esp), %eax movaps %xmm0, (%eax) ret instead of this: _test: subl $76, %esp movl 88(%esp), %eax movaps (%eax), %xmm0 movaps %xmm0, (%esp) movaps %xmm0, 32(%esp) movss 4(%esp), %xmm0 movss 32(%esp), %xmm1 unpcklps %xmm0, %xmm1 movl 84(%esp), %eax movaps (%eax), %xmm0 movaps %xmm0, 16(%esp) movaps %xmm0, 48(%esp) movss 20(%esp), %xmm0 movss 48(%esp), %xmm2 unpcklps %xmm0, %xmm2 unpcklps %xmm1, %xmm2 movl 80(%esp), %eax movaps %xmm2, (%eax) addl $76, %esp ret GCC produces this (with -fomit-frame-pointer): _test: subl $12, %esp movl 20(%esp), %eax movaps (%eax), %xmm0 movl 24(%esp), %eax unpcklps (%eax), %xmm0 movl 16(%esp), %eax movaps %xmm0, (%eax) addl $12, %esp ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27233 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-28Don't crash on X^X if X is a vector. Instead, produce a vector of zeros.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27229 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-25Don't call SimplifyDemandedBits on vectorsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27128 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-19fold insertelement(buildvector) -> buildvector if the inserted element # isChris Lattner
a constant. This implements test_constant_insert in CodeGen/Generic/vector.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26851 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-17Remove BRTWOWAY*Nate Begeman
Make the PPC backend not dependent on BRTWOWAY_CC and make the branch selector smarter about the code it generates, fixing a case in the readme. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26814 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-13make sure dead token factor nodes are removed by the dag combiner.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26731 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-13Fold X+Y -> X|Y when safe. This implements:Chris Lattner
Regression/CodeGen/PowerPC/and_add.ll a case that occurs with dynamic allocas of constant size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26727 91177308-0d34-0410-b5e6-96231b3b80d8
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2025-05-03 00:09:00 +0000