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Make use of imm12 version of Thumb2 ldr / str instructions more aggressively.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85743 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1115,6 +1115,7 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
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unsigned FrameReg = ARM::SP;
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int FrameIndex = MI.getOperand(i).getIndex();
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int Offset = MFI->getObjectOffset(FrameIndex) + MFI->getStackSize() + SPAdj;
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bool isFixed = MFI->isFixedObjectIndex(FrameIndex);
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// When doing dynamic stack realignment, all of these need to change(?)
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if (AFI->isGPRCalleeSavedArea1Frame(FrameIndex))
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@ -1127,7 +1128,7 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
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// When dynamically realigning the stack, use the frame pointer for
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// parameters, and the stack pointer for locals.
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assert (hasFP(MF) && "dynamic stack realignment without a FP!");
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if (FrameIndex < 0) {
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if (isFixed) {
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FrameReg = getFrameRegister(MF);
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Offset -= AFI->getFramePtrSpillOffset();
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// When referencing from the frame pointer, stack pointer adjustments
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@ -1136,13 +1137,22 @@ ARMBaseRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
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}
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} else if (hasFP(MF) && AFI->hasStackFrame()) {
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assert(SPAdj == 0 && "Unexpected stack offset!");
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// Use frame pointer to reference fixed objects unless this is a
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// frameless function.
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FrameReg = getFrameRegister(MF);
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Offset -= AFI->getFramePtrSpillOffset();
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if (isFixed || MFI->hasVarSizedObjects()) {
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// Use frame pointer to reference fixed objects unless this is a
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// frameless function.
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FrameReg = getFrameRegister(MF);
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Offset -= AFI->getFramePtrSpillOffset();
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} else if (AFI->isThumb2Function()) {
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// In Thumb2 mode, the negative offset is very limited.
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int FPOffset = Offset - AFI->getFramePtrSpillOffset();
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if (FPOffset >= -255 && FPOffset < 0) {
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FrameReg = getFrameRegister(MF);
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Offset = FPOffset;
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}
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}
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}
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// modify MI as necessary to handle as much of 'Offset' as possible
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// Modify MI as necessary to handle as much of 'Offset' as possible
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bool Done = false;
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if (!AFI->isThumbFunction())
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Done = rewriteARMFrameIndex(MI, i, FrameReg, Offset, TII);
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75
test/CodeGen/Thumb2/ldr-str-imm12.ll
Normal file
75
test/CodeGen/Thumb2/ldr-str-imm12.ll
Normal file
@ -0,0 +1,75 @@
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; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -relocation-model=pic -disable-fp-elim | FileCheck %s
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; rdar://7352504
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; Make sure we use "str r9, [sp, #+28]" instead of "sub.w r4, r7, #256" followed by "str r9, [r4, #-32]".
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%0 = type { i16, i8, i8 }
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%1 = type { [2 x i32], [2 x i32] }
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%2 = type { %union.rec* }
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%struct.FILE_POS = type { i8, i8, i16, i32 }
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%struct.GAP = type { i8, i8, i16 }
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%struct.LIST = type { %union.rec*, %union.rec* }
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%struct.STYLE = type { %union.anon, %union.anon, i16, i16, i32 }
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%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 }
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%union.FIRST_UNION = type { %struct.FILE_POS }
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%union.FOURTH_UNION = type { %struct.STYLE }
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%union.SECOND_UNION = type { %0 }
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%union.THIRD_UNION = type { %1 }
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%union.anon = type { %struct.GAP }
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%union.rec = type { %struct.head_type }
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@zz_hold = external global %union.rec* ; <%union.rec**> [#uses=2]
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@zz_res = external global %union.rec* ; <%union.rec**> [#uses=1]
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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 {
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entry:
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; CHECK: ldr.w r9, [r7, #+32]
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; CHECK-NEXT : str.w r9, [sp, #+28]
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%xgaps.i = alloca [32 x %union.rec*], align 4 ; <[32 x %union.rec*]*> [#uses=0]
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%ycomp.i = alloca [32 x %union.rec*], align 4 ; <[32 x %union.rec*]*> [#uses=0]
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br i1 false, label %bb, label %bb20
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bb: ; preds = %entry
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unreachable
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bb20: ; preds = %entry
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switch i32 undef, label %bb1287 [
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i32 11, label %bb119
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i32 12, label %bb119
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i32 21, label %bb420
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i32 23, label %bb420
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i32 45, label %bb438
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i32 46, label %bb438
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i32 55, label %bb533
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i32 56, label %bb569
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i32 64, label %bb745
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i32 78, label %bb1098
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]
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bb119: ; preds = %bb20, %bb20
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unreachable
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bb420: ; preds = %bb20, %bb20
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store %union.rec* null, %union.rec** @zz_hold, align 4
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store %union.rec* null, %union.rec** @zz_res, align 4
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store %union.rec* %x, %union.rec** @zz_hold, align 4
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%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]
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unreachable
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bb438: ; preds = %bb20, %bb20
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unreachable
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bb533: ; preds = %bb20
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ret %union.rec* %x
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bb569: ; preds = %bb20
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unreachable
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bb745: ; preds = %bb20
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unreachable
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bb1098: ; preds = %bb20
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unreachable
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bb1287: ; preds = %bb20
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unreachable
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}
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