6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-08-21 03:29:40 +00:00
Code Issues Projects Releases Wiki Activity

Make use of imm12 version of Thumb2 ldr / str instructions more aggressively.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85743 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-11-01 21:12:51 +00:00
parent f51635cd30
commit 48d8afab73
2 changed files with 91 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
lib/Target/ARM/ARMBaseRegisterInfo.cpp
View File

@ -1115,6 +1115,7 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
unsigned FrameReg = ARM::SP;
int FrameIndex = MI.getOperand(i).getIndex();
int Offset = MFI->getObjectOffset(FrameIndex) + MFI->getStackSize() + SPAdj;
bool isFixed = MFI->isFixedObjectIndex(FrameIndex);
// When doing dynamic stack realignment, all of these need to change(?)
if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
@ -1127,7 +1128,7 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// When dynamically realigning the stack, use the frame pointer for
// parameters, and the stack pointer for locals.
assert (hasFP(MF) && "dynamic stack realignment without a FP!");
if (FrameIndex < 0) {
if (isFixed) {
FrameReg = getFrameRegister(MF);
Offset -= AFI->getFramePtrSpillOffset();
// When referencing from the frame pointer, stack pointer adjustments
@ -1136,13 +1137,22 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
}
} else if (hasFP(MF) && AFI->hasStackFrame()) {
assert(SPAdj == 0 && "Unexpected stack offset!");
// Use frame pointer to reference fixed objects unless this is a
// frameless function.
FrameReg = getFrameRegister(MF);
Offset -= AFI->getFramePtrSpillOffset();
if (isFixed || MFI->hasVarSizedObjects()) {
// Use frame pointer to reference fixed objects unless this is a
// frameless function.
FrameReg = getFrameRegister(MF);
Offset -= AFI->getFramePtrSpillOffset();
} else if (AFI->isThumb2Function()) {
// In Thumb2 mode, the negative offset is very limited.
int FPOffset = Offset - AFI->getFramePtrSpillOffset();
if (FPOffset >= -255 && FPOffset < 0) {
FrameReg = getFrameRegister(MF);
Offset = FPOffset;
}
}
}
// modify MI as necessary to handle as much of 'Offset' as possible
// Modify MI as necessary to handle as much of 'Offset' as possible
bool Done = false;
if (!AFI->isThumbFunction())
Done = rewriteARMFrameIndex(MI, i, FrameReg, Offset, TII);

75
test/CodeGen/Thumb2/ldr-str-imm12.ll Normal file
View File

@ -0,0 +1,75 @@
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -relocation-model=pic -disable-fp-elim | FileCheck %s
; rdar://7352504
; Make sure we use "str r9, [sp, #+28]" instead of "sub.w r4, r7, #256" followed by "str r9, [r4, #-32]".
%0 = type { i16, i8, i8 }
%1 = type { [2 x i32], [2 x i32] }
%2 = type { %union.rec* }
%struct.FILE_POS = type { i8, i8, i16, i32 }
%struct.GAP = type { i8, i8, i16 }
%struct.LIST = type { %union.rec*, %union.rec* }
%struct.STYLE = type { %union.anon, %union.anon, i16, i16, i32 }
%struct.head_type = type { [2 x %struct.LIST], %union.FIRST_UNION, %union.SECOND_UNION, %union.THIRD_UNION, %union.FOURTH_UNION, %union.rec*, %2, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, i32 }
%union.FIRST_UNION = type { %struct.FILE_POS }
%union.FOURTH_UNION = type { %struct.STYLE }
%union.SECOND_UNION = type { %0 }
%union.THIRD_UNION = type { %1 }
%union.anon = type { %struct.GAP }
%union.rec = type { %struct.head_type }
@zz_hold = external global %union.rec* ; <%union.rec**> [#uses=2]
@zz_res = external global %union.rec* ; <%union.rec**> [#uses=1]
define arm_apcscc %union.rec* @Manifest(%union.rec* %x, %union.rec* %env, %struct.STYLE* %style, %union.rec** %bthr, %union.rec** %fthr, %union.rec** %target, %union.rec** %crs, i32 %ok, i32 %need_expand, %union.rec** %enclose, i32 %fcr) nounwind {
entry:
; CHECK: ldr.w r9, [r7, #+32]
; CHECK-NEXT : str.w r9, [sp, #+28]
%xgaps.i = alloca [32 x %union.rec*], align 4 ; <[32 x %union.rec*]*> [#uses=0]
%ycomp.i = alloca [32 x %union.rec*], align 4 ; <[32 x %union.rec*]*> [#uses=0]
br i1 false, label %bb, label %bb20
bb: ; preds = %entry
unreachable
bb20: ; preds = %entry
switch i32 undef, label %bb1287 [
i32 11, label %bb119
i32 12, label %bb119
i32 21, label %bb420
i32 23, label %bb420
i32 45, label %bb438
i32 46, label %bb438
i32 55, label %bb533
i32 56, label %bb569
i32 64, label %bb745
i32 78, label %bb1098
]
bb119: ; preds = %bb20, %bb20
unreachable
bb420: ; preds = %bb20, %bb20
store %union.rec* null, %union.rec** @zz_hold, align 4
store %union.rec* null, %union.rec** @zz_res, align 4
store %union.rec* %x, %union.rec** @zz_hold, align 4
%0 = call arm_apcscc %union.rec* @Manifest(%union.rec* undef, %union.rec* %env, %struct.STYLE* %style, %union.rec** %bthr, %union.rec** %fthr, %union.rec** %target, %union.rec** %crs, i32 %ok, i32 %need_expand, %union.rec** %enclose, i32 %fcr) nounwind ; <%union.rec*> [#uses=0]
unreachable
bb438: ; preds = %bb20, %bb20
unreachable
bb533: ; preds = %bb20
ret %union.rec* %x
bb569: ; preds = %bb20
unreachable
bb745: ; preds = %bb20
unreachable
bb1098: ; preds = %bb20
unreachable
bb1287: ; preds = %bb20
unreachable
}