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Implement Thumb2 ldr.

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After much back and forth, I decided to deviate from ARM design and split LDR into 4 instructions (r + imm12, r + imm8, r + r << imm12, constantpool). The advantage of this is 1) it follows the latest ARM technical manual, and 2) makes it easier to reduce the width of the instruction later. The down side is this creates more inconsistency between the two sub-targets. We should split ARM LDR instruction in a similar fashion later. I've added a README entry for this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74420 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-06-29 07:51:04 +00:00
parent 95c1f5ba64
commit 055b0310f8
13 changed files with 488 additions and 162 deletions
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2
lib/Target/ARM/ARMAddressingModes.h
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@ -305,7 +305,7 @@ namespace ARM_AM {
/// abcdefgh abcdefgh abcdefgh abcdefgh control = 3
/// Return -1 if none of the above apply.
/// See ARM Reference Manual A6.3.2.
static inline int getT2SOImmValSplat (unsigned V) {
static inline int getT2SOImmValSplat(unsigned V) {
unsigned u, Vs, Imm;
// control = 0
if ((V & 0xffffff00) == 0)