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typedef struct { unsigned prefix : 4; unsigned code : 4; unsigned unsigned_p : 4; } tree_common; int foo(tree_common *a, tree_common *b) { return a->code == b->code; } into: _foo: movl 4(%esp), %eax movl 8(%esp), %ecx movl (%eax), %eax xorl (%ecx), %eax # TRUNCATE movb %al, %al shrb $4, %al testb %al, %al sete %al movzbl %al, %eax ret instead of: _foo: movl 8(%esp), %eax movb (%eax), %al shrb $4, %al movl 4(%esp), %ecx movb (%ecx), %cl shrb $4, %cl cmpb %al, %cl sete %al movzbl %al, %eax ret saving one cycle by eliminating a shift. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31727 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
Hello | ||
Instrumentation | ||
IPO | ||
Scalar | ||
Utils | ||
ExprTypeConvert.cpp | ||
LevelRaise.cpp | ||
Makefile | ||
TransformInternals.cpp | ||
TransformInternals.h |