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Update some stuff now that the new rlwimi code has gone in

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28162 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2006-05-08 02:52:38 +00:00
parent 5c742681ed
commit 93376b083e
2 changed files with 0 additions and 70 deletions
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1
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -405,7 +405,6 @@ SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
TLI.ComputeMaskedBits(Op0, TgtMask, LKZ, LKO);
TLI.ComputeMaskedBits(Op1, TgtMask, RKZ, RKO);
// FIXME: rotrwi / rotlwi
if ((LKZ | RKZ) == 0x00000000FFFFFFFFULL) {
unsigned PInsMask = ~RKZ;
unsigned PTgtMask = ~LKZ;

69
lib/Target/PowerPC/README.txt
View File

@ -85,75 +85,6 @@ more than one use. Itanium will want this too.
===-------------------------------------------------------------------------===
#define ARRAY_LENGTH 16
union bitfield {
struct {
#ifndef __ppc__
unsigned int field0 : 6;
unsigned int field1 : 6;
unsigned int field2 : 6;
unsigned int field3 : 6;
unsigned int field4 : 3;
unsigned int field5 : 4;
unsigned int field6 : 1;
#else
unsigned int field6 : 1;
unsigned int field5 : 4;
unsigned int field4 : 3;
unsigned int field3 : 6;
unsigned int field2 : 6;
unsigned int field1 : 6;
unsigned int field0 : 6;
#endif
} bitfields, bits;
unsigned int u32All;
signed int i32All;
float f32All;
};
typedef struct program_t {
union bitfield array[ARRAY_LENGTH];
int size;
int loaded;
} program;
void AdjustBitfields(program* prog, unsigned int fmt1)
{
prog->array[0].bitfields.field0 = fmt1;
prog->array[0].bitfields.field1 = fmt1 + 1;
}
We currently generate:
_AdjustBitfields:
lwz r2, 0(r3)
addi r5, r4, 1
rlwinm r2, r2, 0, 0, 19
rlwinm r5, r5, 6, 20, 25
rlwimi r2, r4, 0, 26, 31
or r2, r2, r5
stw r2, 0(r3)
blr
We should teach someone that or (rlwimi, rlwinm) with disjoint masks can be
turned into rlwimi (rlwimi)
The better codegen would be:
_AdjustBitfields:
lwz r0,0(r3)
rlwinm r4,r4,0,0xff
rlwimi r0,r4,0,26,31
addi r4,r4,1
rlwimi r0,r4,6,20,25
stw r0,0(r3)
blr
===-------------------------------------------------------------------------===
Compile this:
int %f1(int %a, int %b) {