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894061e4f5
If the stack pointer is altered for local variables and we are generating Thumb2 execute-only code the .pad directive is missing. Usually the size of the adjustment is stored in a PC-relative location and loaded into a register which is then added to the stack pointer. However when we are generating execute-only code code the size of the adjustment is instead generated using the MOVW/MOVT instruction pair. As a by product of handling the execute-only case this also fixes an existing issue that in the none execute-only case the .pad directive was generated against the load of the constant to a register instruction, instead of the instruction which adds the register to the stack pointer. Differential Revision: https://reviews.llvm.org/D76849
39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv8m.base-arm-none-eabi | FileCheck %s
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define void @fn() {
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entry:
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; CHECK-LABEL: fn:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r4, r5, r6, lr}
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; CHECK-NEXT: push {r4, r5, r6, lr}
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; CHECK-NEXT: ldr r6, .LCPI0_0
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; CHECK-NEXT: .pad #1600
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; CHECK-NEXT: add sp, r6
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; CHECK: .LCPI0_0:
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; CHECK_NEXT: long 4294963196
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%a = alloca [400 x i32], align 4
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%arraydecay = getelementptr inbounds [400 x i32], [400 x i32]* %a, i32 0, i32 0
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call void @bar(i32* %arraydecay)
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ret void
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}
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define void @execute_only_fn() #0 {
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entry:
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; CHECK-LABEL: execute_only_fn:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r4, r5, r6, lr}
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; CHECK-NEXT: push {r4, r5, r6, lr}
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; CHECK-NEXT: movw r6, #63936
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; CHECK-NEXT: movt r6, #65535
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; CHECK-NEXT: .pad #1600
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; CHECK-NEXT: add sp, r6
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%a = alloca [400 x i32], align 4
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%arraydecay = getelementptr inbounds [400 x i32], [400 x i32]* %a, i32 0, i32 0
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call void @bar(i32* %arraydecay)
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ret void
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}
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declare dso_local void @bar(i32*)
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attributes #0 = { noinline optnone "target-features"="+armv8-m.base,+execute-only,+thumb-mode" }
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