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283f599fca
Code like the following:
define i32 @foo(i32 %a, i1 zeroext %b) addrspace(1) {
entry:
%conv = zext i1 %b to i32
%add = add nsw i32 %conv, %a
ret i32 %add
}
Would compile to the following (incorrect) code:
foo:
mov r18, r20
clr r19
add r22, r18
adc r23, r19
sbci r24, 0
sbci r25, 0
ret
Those sbci instructions are clearly wrong, they should have been adc
instructions.
This commit improves codegen to use adc instead:
foo:
mov r18, r20
clr r19
ldi r20, 0
ldi r21, 0
add r22, r18
adc r23, r19
adc r24, r20
adc r25, r21
ret
This code is not optimal (it could be just 5 instructions instead of the
current 9) but at least it doesn't miscompile.
Differential Revision: https://reviews.llvm.org/D78439
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| .. | ||
| Analysis | ||
| Assembler | ||
| Bindings | ||
| Bitcode | ||
| BugPoint | ||
| CodeGen | ||
| DebugInfo | ||
| Demangle | ||
| Examples | ||
| ExecutionEngine | ||
| Feature | ||
| FileCheck | ||
| Instrumentation | ||
| Integer | ||
| JitListener | ||
| Linker | ||
| LTO | ||
| MachineVerifier | ||
| MC | ||
| Object | ||
| ObjectYAML | ||
| Other | ||
| Reduce | ||
| SafepointIRVerifier | ||
| Support | ||
| SymbolRewriter | ||
| TableGen | ||
| ThinLTO/X86 | ||
| tools | ||
| Transforms | ||
| Unit | ||
| Verifier | ||
| YAMLParser | ||
| .clang-format | ||
| CMakeLists.txt | ||
| lit.cfg.py | ||
| lit.site.cfg.py.in | ||
| TestRunner.sh | ||