6e54fccede
The instruction-precise, or asynchronous, unwind tables usually take up much more space than the synchronous ones. If a user is concerned about the load size of the program and does not need the features provided with the asynchronous tables, the compiler should be able to generate the more compact variant. This patch changes the generation of CFI instructions for these cases so that they all come in one chunk in the prolog; it emits only one `.cfi_def_cfa*` instruction followed by `.cfi_offset` ones after all stack adjustments and register spills, and avoids generating CFI instructions in the epilog(s) as well as any other exceeding CFI instructions like `.cfi_remember_state` and `.cfi_restore_state`. Effectively, it reverses the effects of D111411 and D114545 on functions with the `uwtable(sync)` attribute. As a side effect, it also restores the behavior on functions that have neither `uwtable` nor `nounwind` attributes. Differential Revision: https://reviews.llvm.org/D153098
71 lines
2.1 KiB
LLVM
71 lines
2.1 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=arm64-none-linux-gnu -frame-pointer=non-leaf -disable-post-ra < %s | FileCheck %s
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declare void @use_addr(ptr)
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@addr = global ptr null
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define void @test_bigframe() {
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; CHECK-LABEL: test_bigframe:
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; CHECK: .cfi_startproc
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%var1 = alloca i8, i32 20000000
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%var2 = alloca i8, i32 16
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%var3 = alloca i8, i32 20000000
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; CHECK: sub sp, sp, #4095, lsl #12 // =16773120
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; CHECK-NEXT: sub sp, sp, #4095, lsl #12 // =16773120
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; CHECK-NEXT: sub sp, sp, #1575, lsl #12 // =6451200
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; CHECK-NEXT: sub sp, sp, #2576
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; CHECK-NEXT: .cfi_def_cfa_offset 40000032
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; CHECK: add [[TMP:x[0-9]+]], sp, #4095, lsl #12
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; CHECK: add [[TMP1:x[0-9]+]], [[TMP]], #787, lsl #12
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; CHECK: add {{x[0-9]+}}, [[TMP1]], #3344
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store volatile ptr %var1, ptr @addr
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%var1plus2 = getelementptr i8, ptr %var1, i32 2
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store volatile ptr %var1plus2, ptr @addr
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; CHECK: add [[TMP:x[0-9]+]], sp, #4095, lsl #12
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; CHECK: add [[TMP1:x[0-9]+]], [[TMP]], #787, lsl #12
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; CHECK: add {{x[0-9]+}}, [[TMP1]], #3328
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store volatile ptr %var2, ptr @addr
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%var2plus2 = getelementptr i8, ptr %var2, i32 2
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store volatile ptr %var2plus2, ptr @addr
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store volatile ptr %var3, ptr @addr
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%var3plus2 = getelementptr i8, ptr %var3, i32 2
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store volatile ptr %var3plus2, ptr @addr
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; CHECK: add sp, sp, #4095, lsl #12
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; CHECK: add sp, sp, #4095, lsl #12
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; CHECK: add sp, sp, #1575, lsl #12
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; CHECK: add sp, sp, #2576
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; CHECK: .cfi_endproc
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ret void
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}
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define void @test_mediumframe() {
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; CHECK-LABEL: test_mediumframe:
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%var1 = alloca i8, i32 1000000
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%var2 = alloca i8, i32 16
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%var3 = alloca i8, i32 1000000
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; CHECK: sub sp, sp, #488, lsl #12 // =1998848
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; CHECK-NEXT: sub sp, sp, #1168
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; CHECK-NEXT: .cfi_def_cfa_offset 2000032
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store volatile ptr %var1, ptr @addr
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; CHECK: add [[VAR1ADDR:x[0-9]+]], sp, #244, lsl #12
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; CHECK: add [[VAR1ADDR]], [[VAR1ADDR]], #592
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; CHECK: add [[VAR2ADDR:x[0-9]+]], sp, #244, lsl #12
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; CHECK: add [[VAR2ADDR]], [[VAR2ADDR]], #576
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store volatile ptr %var2, ptr @addr
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; CHECK: add sp, sp, #488, lsl #12
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; CHECK: add sp, sp, #1168
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ret void
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}
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