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Flesh out a couple of the items in the README

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25928 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2006-02-03 05:17:06 +00:00
parent 2ba0b02e15
commit a63fee898b
1 changed files with 41 additions and 14 deletions
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55
lib/Target/PowerPC/README.txt
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@ -2,20 +2,17 @@ TODO:
* gpr0 allocation
* implement do-loop -> bdnz transform
* implement powerpc-64 for darwin
* use stfiwx in float->int
* Fold add and sub with constant into non-extern, non-weak addresses so this:
lis r2, ha16(l2__ZTV4Cell)
la r2, lo16(l2__ZTV4Cell)(r2)
addi r2, r2, 8
becomes:
lis r2, ha16(l2__ZTV4Cell+8)
la r2, lo16(l2__ZTV4Cell+8)(r2)
===-------------------------------------------------------------------------===
Use the stfiwx instruction for:
void foo(float a, int *b) { *b = a; }
===-------------------------------------------------------------------------===
* Teach LLVM how to codegen this:
unsigned short foo(float a) { return a; }
as:
should be:
_foo:
fctiwz f0,f1
stfd f0,-8(r1)
@ -29,11 +26,15 @@ _foo:
rlwinm r3, r2, 0, 16, 31
blr
* Support 'update' load/store instructions. These are cracked on the G5, but
are still a codesize win.
===-------------------------------------------------------------------------===
* should hint to the branch select pass that it doesn't need to print the
second unconditional branch, so we don't end up with things like:
Support 'update' load/store instructions. These are cracked on the G5, but are
still a codesize win.
===-------------------------------------------------------------------------===
Should hint to the branch select pass that it doesn't need to print the second
unconditional branch, so we don't end up with things like:
b .LBBl42__2E_expand_function_8_674 ; loopentry.24
b .LBBl42__2E_expand_function_8_42 ; NewDefault
b .LBBl42__2E_expand_function_8_42 ; NewDefault
@ -475,3 +476,29 @@ _foo:
Get the C front-end to expand hypot(x,y) -> llvm.sqrt(x*x+y*y) when errno and
precision don't matter (ffastmath). Misc/mandel will like this. :)
===-------------------------------------------------------------------------===
Fold add and sub with constant into non-extern, non-weak addresses so this:
static int a;
void bar(int b) { a = b; }
void foo(unsigned char *c) {
*c = a;
}
So that
_foo:
lis r2, ha16(_a)
la r2, lo16(_a)(r2)
lbz r2, 3(r2)
stb r2, 0(r3)
blr
Becomes
_foo:
lis r2, ha16(_a+3)
lbz r2, lo16(_a+3)(r2)
stb r2, 0(r3)
blr