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Since we have moved unified assembly, switch to ADR instruction instead of a the difficult-to-read .set + add syntax to materialize pc-relative address. 

Turns out this also fixed a poor code selection on Thumb1. I have no idea why we were using a mov + add to do the same thing as ADR before.

llvm-svn: 76889
This commit is contained in:
Evan Cheng 2009-07-23 18:26:03 +00:00
parent 5bf72e20eb
commit 95a73e2eab
2 changed files with 7 additions and 27 deletions
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19
llvm/lib/Target/ARM/ARMInstrThumb.td
View File

@ -552,22 +552,11 @@ let usesCustomDAGSchedInserter = 1 in // Expanded by the scheduler.
// tLEApcrel - Load a pc-relative address into a register without offending the
// assembler.
let Defs = [CPSR] in {
def tLEApcrel : T1Ix2<(outs tGPR:$dst), (ins i32imm:$label),
!strconcat(!strconcat(".set ${:private}PCRELV${:uid}, ($label-(",
"${:private}PCRELL${:uid}+4))\n"),
!strconcat("\tmovs $dst, #${:private}PCRELV${:uid}\n",
"${:private}PCRELL${:uid}:\n\tadd $dst, pc")),
[]>;
def tLEApcrel : T1I<(outs tGPR:$dst), (ins i32imm:$label),
"adr $dst, #$label", []>;
def tLEApcrelJT : T1Ix2<(outs tGPR:$dst), (ins i32imm:$label, i32imm:$id),
!strconcat(!strconcat(".set ${:private}PCRELV${:uid},"
" (${label}_${id:no_hash}-(",
"${:private}PCRELL${:uid}+4))\n"),
!strconcat("\tmovs $dst, #${:private}PCRELV${:uid}\n",
"${:private}PCRELL${:uid}:\n\tadd $dst, pc")),
[]>;
}
def tLEApcrelJT : T1I<(outs tGPR:$dst), (ins i32imm:$label, i32imm:$id),
"adr $dst, #${label}_${id:no_hash}", []>;
//===----------------------------------------------------------------------===//
// TLS Instructions

15
llvm/lib/Target/ARM/ARMInstrThumb2.td
View File

@ -450,20 +450,11 @@ def t2PICADD : T2XI<(outs GPR:$dst), (ins GPR:$lhs, pclabel:$cp),
// LEApcrel - Load a pc-relative address into a register without offending the
// assembler.
def t2LEApcrel : T2XI<(outs GPR:$dst), (ins i32imm:$label, pred:$p),
!strconcat(!strconcat(".set ${:private}PCRELV${:uid}, ($label-(",
"${:private}PCRELL${:uid}+8))\n"),
!strconcat("${:private}PCRELL${:uid}:\n\t",
"add$p $dst, pc, #${:private}PCRELV${:uid}")),
[]>;
"adr$p $dst, #$label", []>;
def t2LEApcrelJT : T2XI<(outs GPR:$dst),
(ins i32imm:$label, i32imm:$id, pred:$p),
!strconcat(!strconcat(".set ${:private}PCRELV${:uid},"
" (${label}_${id:no_hash}-(",
"${:private}PCRELL${:uid}+8))\n"),
!strconcat("${:private}PCRELL${:uid}:\n\t",
"add$p $dst, pc, #${:private}PCRELV${:uid}")),
[]>;
(ins i32imm:$label, i32imm:$id, pred:$p),
"adr$p $dst, #${label}_${id:no_hash}", []>;
// ADD rd, sp, #so_imm
def t2ADDrSPi : T2XI<(outs GPR:$dst), (ins GPR:$sp, t2_so_imm:$imm),