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ARM: correctly expand LDR-lit based globals.

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Quite a major error here: the expansions for the Pseudos with and without
folded load were mixed up. Fortunately it only affects ARM-mode, when not using
movw/movt, on Darwin. I'm guessing no-one actually uses that combination.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223986 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover 2014-12-10 23:40:50 +00:00
parent de68a563bc
commit 19734e7811
5 changed files with 6 additions and 4 deletions
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2
lib/Target/ARM/ARMExpandPseudoInsts.cpp
View File

@ -980,7 +980,7 @@ bool ARMExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
unsigned LDRLITOpc = IsARM ? ARM::LDRi12 : ARM::tLDRpci;
unsigned PICAddOpc =
IsARM
? (Opcode == ARM::LDRLIT_ga_pcrel_ldr ? ARM::PICADD : ARM::PICLDR)
? (Opcode == ARM::LDRLIT_ga_pcrel_ldr ? ARM::PICLDR : ARM::PICADD)
: ARM::tPICADD;
// We need a new const-pool entry to load from.

1
lib/Target/ARM/ARMInstrInfo.td
View File

@ -5315,6 +5315,7 @@ def LDRLIT_ga_pcrel : PseudoInst<(outs GPR:$dst), (ins i32imm:$addr),
(ARMWrapperPIC tglobaladdr:$addr))]>,
Requires<[IsARM, DontUseMovt]>;
let AddedComplexity = 10 in
def LDRLIT_ga_pcrel_ldr : PseudoInst<(outs GPR:$dst), (ins i32imm:$addr),
NoItinerary,
[(set GPR:$dst,

4
test/CodeGen/ARM/cse-ldrlit.ll
View File

@ -33,8 +33,8 @@ false:
; CHECK-ARM-PIC-LABEL: foo:
; CHECK-ARM-PIC: ldr [[VAR_OFFSET:r[0-9]+]], LCPI0_0
; CHECK-ARM-PIC: LPC0_0:
; CHECK-ARM-PIC-NEXT: ldr r0, [pc, [[VAR_OFFSET]]]
; CHECK-ARM-PIC: ldr {{r[1-9][0-9]?}}, [r0, #4]
; CHECK-ARM-PIC-NEXT: add r0, pc, [[VAR_OFFSET]]
; CHECK-ARM-PIC: ldr {{r[0-9]+}}, [r0, #4]
; CHECK-ARM-PIC: LCPI0_0:
; CHECK-ARM-PIC-NEXT: .long _var-(LPC0_0+8)

1
test/CodeGen/ARM/globals.ll
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@ -43,6 +43,7 @@ define i32 @test1() {
; DarwinPIC: LPC0_0:
; DarwinPIC: ldr r0, [pc, r0]
; DarwinPIC: ldr r0, [r0]
; DarwinPIC-NOT: ldr
; DarwinPIC: bx lr
; DarwinPIC: .align 2

2
test/CodeGen/ARM/stack_guard_remat.ll
View File

@ -8,7 +8,7 @@
;PIC: foo2
;PIC: ldr [[R0:r[0-9]+]], [[LABEL0:LCPI[0-9_]+]]
;PIC: [[LABEL1:LPC0_1]]:
;PIC: ldr [[R1:r[0-9]+]], [pc, [[R0]]]
;PIC: add [[R1:r[0-9]+]], pc, [[R0]]
;PIC: ldr [[R2:r[0-9]+]], {{\[}}[[R1]]{{\]}}
;PIC: ldr {{r[0-9]+}}, {{\[}}[[R2]]{{\]}}