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
85 lines
3.5 KiB
LLVM
85 lines
3.5 KiB
LLVM
; RUN: llc -mtriple=arm64-apple-darwin -debug-entry-values -enable-misched=0 -mcpu=cyclone < %s | FileCheck %s
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; RUN: llc -mtriple=arm64-apple-darwin -debug-entry-values -enable-misched=0 -mcpu=cyclone -fast-isel -fast-isel-abort=1 < %s | FileCheck %s
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; Trivial patchpoint codegen
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;
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define i64 @trivial_patchpoint_codegen(i64 %p1, i64 %p2, i64 %p3, i64 %p4) {
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entry:
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; CHECK-LABEL: trivial_patchpoint_codegen:
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; CHECK: mov x16, #244834610708480
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; CHECK-NEXT: movk x16, #48879, lsl #16
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; CHECK-NEXT: movk x16, #51966
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; CHECK-NEXT: blr x16
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; CHECK: mov x16, #244834610708480
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; CHECK-NEXT: movk x16, #48879, lsl #16
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; CHECK-NEXT: movk x16, #51967
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; CHECK-NEXT: blr x16
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; CHECK: ret
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%resolveCall2 = inttoptr i64 244837814094590 to ptr
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%result = tail call i64 (i64, i32, ptr, i32, ...) @llvm.experimental.patchpoint.i64(i64 2, i32 20, ptr %resolveCall2, i32 4, i64 %p1, i64 %p2, i64 %p3, i64 %p4)
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%resolveCall3 = inttoptr i64 244837814094591 to ptr
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tail call void (i64, i32, ptr, i32, ...) @llvm.experimental.patchpoint.void(i64 3, i32 20, ptr %resolveCall3, i32 2, i64 %p1, i64 %result)
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ret i64 %result
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}
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; Caller frame metadata with stackmaps. This should not be optimized
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; as a leaf function.
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;
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; CHECK-LABEL: caller_meta_leaf
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; CHECK: sub sp, sp, #48
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; CHECK-NEXT: stp x29, x30, [sp, #32]
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; CHECK-NEXT: add x29, sp, #32
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; CHECK: Ltmp
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; CHECK: add sp, sp, #48
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; CHECK: ret
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define void @caller_meta_leaf() {
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entry:
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%metadata = alloca i64, i32 3, align 8
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store i64 11, ptr %metadata
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store i64 12, ptr %metadata
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store i64 13, ptr %metadata
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call void (i64, i32, ...) @llvm.experimental.stackmap(i64 4, i32 0, ptr %metadata)
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ret void
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}
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; Test patchpoints reusing the same TargetConstant.
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; <rdar:15390785> Assertion failed: (CI.getNumArgOperands() >= NumArgs + 4)
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; There is no way to verify this, since it depends on memory allocation.
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; But I think it's useful to include as a working example.
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define i64 @testLowerConstant(i64 %arg, i64 %tmp2, i64 %tmp10, ptr %tmp33, i64 %tmp79) {
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entry:
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%tmp80 = add i64 %tmp79, -16
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%tmp81 = inttoptr i64 %tmp80 to ptr
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%tmp82 = load i64, ptr %tmp81, align 8
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 14, i32 8, i64 %arg, i64 %tmp2, i64 %tmp10, i64 %tmp82)
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tail call void (i64, i32, ptr, i32, ...) @llvm.experimental.patchpoint.void(i64 15, i32 32, ptr null, i32 3, i64 %arg, i64 %tmp10, i64 %tmp82)
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%tmp83 = load i64, ptr %tmp33, align 8
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%tmp84 = add i64 %tmp83, -24
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%tmp85 = inttoptr i64 %tmp84 to ptr
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%tmp86 = load i64, ptr %tmp85, align 8
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tail call void (i64, i32, ...) @llvm.experimental.stackmap(i64 17, i32 8, i64 %arg, i64 %tmp10, i64 %tmp86)
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tail call void (i64, i32, ptr, i32, ...) @llvm.experimental.patchpoint.void(i64 18, i32 32, ptr null, i32 3, i64 %arg, i64 %tmp10, i64 %tmp86)
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ret i64 10
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}
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; Test small patchpoints that don't emit calls.
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define void @small_patchpoint_codegen(i64 %p1, i64 %p2, i64 %p3, i64 %p4) {
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entry:
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; CHECK-LABEL: small_patchpoint_codegen:
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; CHECK: Ltmp
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; CHECK: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: nop
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; CHECK-NEXT: ldp
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; CHECK-NEXT: ret
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%result = tail call i64 (i64, i32, ptr, i32, ...) @llvm.experimental.patchpoint.i64(i64 5, i32 20, ptr null, i32 2, i64 %p1, i64 %p2)
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ret void
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}
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declare void @llvm.experimental.stackmap(i64, i32, ...)
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declare void @llvm.experimental.patchpoint.void(i64, i32, ptr, i32, ...)
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declare i64 @llvm.experimental.patchpoint.i64(i64, i32, ptr, i32, ...)
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