50a97aacac
Re-commit of 32e8b550e5439c7e4aafa73894faffd5f25d0d05 This patch rearranges emission of CFI instructions, so the resulting DWARF and `.eh_frame` information is precise at every instruction. The current state is that the unwind info is emitted only after the function prologue. This is fine for synchronous (e.g. C++) exceptions, but the information is generally incorrect when the program counter is at an instruction in the prologue or the epilogue, for example: ``` stp x29, x30, [sp, #-16]! // 16-byte Folded Spill mov x29, sp .cfi_def_cfa w29, 16 ... ``` after the `stp` is executed the (initial) rule for the CFA still says the CFA is in the `sp`, even though it's already offset by 16 bytes A correct unwind info could look like: ``` stp x29, x30, [sp, #-16]! // 16-byte Folded Spill .cfi_def_cfa_offset 16 mov x29, sp .cfi_def_cfa w29, 16 ... ``` Having this information precise up to an instruction is useful for sampling profilers that would like to get a stack backtrace. The end goal (towards this patch is just a step) is to have fully working `-fasynchronous-unwind-tables`. Reviewed By: danielkiss, MaskRay Differential Revision: https://reviews.llvm.org/D111411
83 lines
2.7 KiB
LLVM
83 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64-none-linux-gnu -mattr=+neon,+fullfp16 < %s -o -| FileCheck %s
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declare half @llvm.fabs.f16(half)
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declare float @llvm.fabs.f32(float)
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declare double @llvm.fabs.f64(double)
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declare fp128 @llvm.fabs.f128(fp128)
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; INFINITY requires loading the constant for _Float16
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define i32 @replace_isinf_call_f16(half %x) {
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; CHECK-LABEL: replace_isinf_call_f16:
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; CHECK: // %bb.0:
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; CHECK-NEXT: adrp x8, .LCPI0_0
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; CHECK-NEXT: fabs h0, h0
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; CHECK-NEXT: ldr h1, [x8, :lo12:.LCPI0_0]
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; CHECK-NEXT: fcmp h0, h1
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%abs = tail call half @llvm.fabs.f16(half %x)
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%cmpinf = fcmp oeq half %abs, 0xH7C00
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%ret = zext i1 %cmpinf to i32
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ret i32 %ret
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}
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; Check if INFINITY for float is materialized
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define i32 @replace_isinf_call_f32(float %x) {
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; CHECK-LABEL: replace_isinf_call_f32:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov w8, #2139095040
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; CHECK-NEXT: fabs s0, s0
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; CHECK-NEXT: fmov s1, w8
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; CHECK-NEXT: fcmp s0, s1
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%abs = tail call float @llvm.fabs.f32(float %x)
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%cmpinf = fcmp oeq float %abs, 0x7FF0000000000000
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%ret = zext i1 %cmpinf to i32
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ret i32 %ret
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}
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; Check if INFINITY for double is materialized
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define i32 @replace_isinf_call_f64(double %x) {
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; CHECK-LABEL: replace_isinf_call_f64:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9218868437227405312
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; CHECK-NEXT: fabs d0, d0
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; CHECK-NEXT: fmov d1, x8
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; CHECK-NEXT: fcmp d0, d1
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: ret
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%abs = tail call double @llvm.fabs.f64(double %x)
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%cmpinf = fcmp oeq double %abs, 0x7FF0000000000000
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%ret = zext i1 %cmpinf to i32
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ret i32 %ret
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}
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; For long double it still requires loading the constant.
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define i32 @replace_isinf_call_f128(fp128 %x) {
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; CHECK-LABEL: replace_isinf_call_f128:
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; CHECK: // %bb.0:
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; CHECK-NEXT: sub sp, sp, #32
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; CHECK-NEXT: .cfi_def_cfa_offset 32
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; CHECK-NEXT: str x30, [sp, #16] // 8-byte Folded Spill
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; CHECK-NEXT: .cfi_offset w30, -16
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; CHECK-NEXT: str q0, [sp]
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; CHECK-NEXT: ldrb w8, [sp, #15]
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; CHECK-NEXT: and w8, w8, #0x7f
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; CHECK-NEXT: strb w8, [sp, #15]
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; CHECK-NEXT: adrp x8, .LCPI3_0
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; CHECK-NEXT: ldr q0, [sp]
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; CHECK-NEXT: ldr q1, [x8, :lo12:.LCPI3_0]
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; CHECK-NEXT: bl __eqtf2
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; CHECK-NEXT: ldr x30, [sp, #16] // 8-byte Folded Reload
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; CHECK-NEXT: cmp w0, #0
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; CHECK-NEXT: cset w0, eq
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; CHECK-NEXT: add sp, sp, #32
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; CHECK-NEXT: ret
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%abs = tail call fp128 @llvm.fabs.f128(fp128 %x)
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%cmpinf = fcmp oeq fp128 %abs, 0xL00000000000000007FFF000000000000
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%ret = zext i1 %cmpinf to i32
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ret i32 %ret
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}
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