mirror of
https://github.com/c64scene-ar/llvm-6502.git
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eed919b1ba
from a piece of a large store when both are in the same block. This allows clang to compile the testcase in PR4216 to this code: _test_bitfield: movl 4(%esp), %eax movl %eax, %ecx andl $-65536, %ecx orl $32962, %eax andl $40186, %eax orl %ecx, %eax ret This is not ideal, but is a whole lot better than the code produced by llvm-gcc: _test_bitfield: movw $-32574, %ax orw 4(%esp), %ax andw $-25350, %ax movw %ax, 4(%esp) movw 7(%esp), %cx shlw $8, %cx movzbl 6(%esp), %edx orw %cx, %dx movzwl %dx, %ecx shll $16, %ecx movzwl %ax, %eax orl %ecx, %eax ret and dramatically better than that produced by gcc 4.2: _test_bitfield: pushl %ebx call L3 "L00000000001$pb": L3: popl %ebx movl 8(%esp), %eax leal 0(,%eax,4), %edx sarb $7, %dl movl %eax, %ecx andl $7168, %ecx andl $-7201, %ebx movzbl %dl, %edx andl $1, %edx sall $5, %edx orl %ecx, %ebx orl %edx, %ebx andl $24, %eax andl $-58336, %ebx orl %eax, %ebx orl $32962, %ebx movl %ebx, %eax popl %ebx ret git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82439 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| .. | ||
| ADCE | ||
| ArgumentPromotion | ||
| BlockPlacement | ||
| BranchFolding | ||
| CodeExtractor | ||
| CodeGenPrepare | ||
| CondProp | ||
| ConstantMerge | ||
| ConstProp | ||
| DeadArgElim | ||
| DeadStoreElimination | ||
| FunctionAttrs | ||
| GlobalDCE | ||
| GlobalOpt | ||
| GVN | ||
| GVNPRE | ||
| IndMemRem | ||
| IndVarSimplify | ||
| Inline | ||
| InstCombine | ||
| Internalize | ||
| IPConstantProp | ||
| JumpThreading | ||
| LCSSA | ||
| LICM | ||
| LoopDeletion | ||
| LoopIndexSplit | ||
| LoopRotate | ||
| LoopSimplify | ||
| LoopStrengthReduce | ||
| LoopUnroll | ||
| LoopUnswitch | ||
| LowerInvoke | ||
| LowerSetJmp | ||
| LowerSwitch | ||
| Mem2Reg | ||
| MemCpyOpt | ||
| MergeFunc | ||
| PredicateSimplifier | ||
| PruneEH | ||
| RaiseAllocations | ||
| Reassociate | ||
| ScalarRepl | ||
| SCCP | ||
| SimplifyCFG | ||
| SimplifyLibCalls | ||
| SRETPromotion | ||
| SSI | ||
| StripSymbols | ||
| TailCallElim | ||
| TailDup | ||