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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26375 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-02-25 10:04:07 +00:00
parent 71fb834b50
commit 53f280a30e
1 changed files with 3 additions and 20 deletions
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23
lib/Target/X86/README.txt
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@ -157,6 +157,7 @@ aren't.
Use push/pop instructions in prolog/epilog sequences instead of stores off
ESP (certain code size win, perf win on some [which?] processors).
Also, it appears icc use push for parameter passing. Need to investigate.
//===---------------------------------------------------------------------===//
@ -411,22 +412,6 @@ void clearbit(int *target, int bit) {
//===---------------------------------------------------------------------===//
Easy: Global addresses are not always allowed as immediates. For this:
int dst = 0; int *ptr = 0;
void foo() { ptr = &dst; }
we get this:
_foo:
movl $_dst, %eax
movl %eax, _ptr
ret
When: "movl $_dst, _ptr" is sufficient.
//===---------------------------------------------------------------------===//
Instead of the following for memset char*, 1, 10:
movl $16843009, 4(%edx)
@ -505,10 +490,6 @@ and ISD::FMAX node types?
//===---------------------------------------------------------------------===//
Select (add, x, GlobalAddress) to ADD32ri, etc. when it's appropriate.
//===---------------------------------------------------------------------===//
The first BB of this code:
declare bool %foo()
@ -533,4 +514,6 @@ _bar:
It would be better to emit "cmp %al, 1" than a xor and test.
//===---------------------------------------------------------------------===//
Enable X86InstrInfo::convertToThreeAddress().