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llvm-project/llvm/test/CodeGen/RISCV/interrupt-attr-nocall.ll

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[RISCV] Add support for _interrupt attribute - Save/restore only registers that are used. This includes Callee saved registers and Caller saved registers (arguments and temporaries) for integer and FP registers. - If there is a call in the interrupt handler, save/restore all Caller saved registers (arguments and temporaries) and all FP registers. - Emit special return instructions depending on "interrupt" attribute type. Based on initial patch by Zhaoshi Zheng. Reviewers: asb Reviewed By: asb Subscribers: rkruppe, the_o, MartinMosbeck, brucehoult, rbar, johnrusso, simoncook, sabuasal, niosHD, kito-cheng, shiva0217, zzheng, edward-jones, mgrang, rogfer01, llvm-commits Differential Revision: https://reviews.llvm.org/D48411 llvm-svn: 338047
2018-07-27 01:49:43 +08:00
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple riscv32-unknown-elf -o - %s \
; RUN: 2>&1 | FileCheck %s -check-prefix CHECK-RV32
; RUN: llc -mtriple riscv32-unknown-elf -mattr=+f -o - %s \
; RUN: 2>&1 | FileCheck %s -check-prefix CHECK-RV32-F
; RUN: llc -mtriple riscv32-unknown-elf -mattr=+f,+d -o - %s \
; RUN: 2>&1 | FileCheck %s -check-prefix CHECK-RV32-FD
;
; TODO: Add RV64 tests when we can lower global addresses.
; Checking all registers that are used are being saved.
; This includes Caller (arguments and temps) and
; Callee saved registers.
;
; extern int a, b, c;
; __attribute__((interrupt)) void foo_no_call(void) {
; c = a + b;
; }
;
@a = external global i32
@b = external global i32
@c = external global i32
define void @foo_i32() #0 {
; CHECK-RV32-LABEL: foo_i32:
; CHECK-RV32: # %bb.0:
; CHECK-RV32-NEXT: addi sp, sp, -16
; CHECK-RV32-NEXT: sw a0, 12(sp)
; CHECK-RV32-NEXT: sw a1, 8(sp)
; CHECK-RV32-NEXT: lui a0, %hi(a)
; CHECK-RV32-NEXT: lw a0, %lo(a)(a0)
; CHECK-RV32-NEXT: lui a1, %hi(b)
; CHECK-RV32-NEXT: lw a1, %lo(b)(a1)
; CHECK-RV32-NEXT: add a0, a1, a0
; CHECK-RV32-NEXT: lui a1, %hi(c)
; CHECK-RV32-NEXT: sw a0, %lo(c)(a1)
; CHECK-RV32-NEXT: lw a1, 8(sp)
; CHECK-RV32-NEXT: lw a0, 12(sp)
; CHECK-RV32-NEXT: addi sp, sp, 16
; CHECK-RV32-NEXT: mret
;
%1 = load i32, i32* @a
%2 = load i32, i32* @b
%add = add nsw i32 %2, %1
store i32 %add, i32* @c
ret void
}
;
; Additionally check frame pointer and return address are properly saved.
;
define void @foo_fp_i32() #1 {
; CHECK-RV32-LABEL: foo_fp_i32:
; CHECK-RV32: # %bb.0:
; CHECK-RV32-NEXT: addi sp, sp, -16
; CHECK-RV32-NEXT: sw ra, 12(sp)
; CHECK-RV32-NEXT: sw s0, 8(sp)
; CHECK-RV32-NEXT: sw a0, 4(sp)
; CHECK-RV32-NEXT: sw a1, 0(sp)
; CHECK-RV32-NEXT: addi s0, sp, 16
; CHECK-RV32-NEXT: lui a0, %hi(a)
; CHECK-RV32-NEXT: lw a0, %lo(a)(a0)
; CHECK-RV32-NEXT: lui a1, %hi(b)
; CHECK-RV32-NEXT: lw a1, %lo(b)(a1)
; CHECK-RV32-NEXT: add a0, a1, a0
; CHECK-RV32-NEXT: lui a1, %hi(c)
; CHECK-RV32-NEXT: sw a0, %lo(c)(a1)
; CHECK-RV32-NEXT: lw a1, 0(sp)
; CHECK-RV32-NEXT: lw a0, 4(sp)
; CHECK-RV32-NEXT: lw s0, 8(sp)
; CHECK-RV32-NEXT: lw ra, 12(sp)
; CHECK-RV32-NEXT: addi sp, sp, 16
; CHECK-RV32-NEXT: mret
;
%1 = load i32, i32* @a
%2 = load i32, i32* @b
%add = add nsw i32 %2, %1
store i32 %add, i32* @c
ret void
}
@e = external global float
@f = external global float
@d = external global float
define void @foo_float() #0 {
; CHECK-RV32-F-LABEL: foo_float:
; CHECK-RV32-F: # %bb.0:
; CHECK-RV32-F-NEXT: addi sp, sp, -16
; CHECK-RV32-F-NEXT: sw a0, 12(sp)
; CHECK-RV32-F-NEXT: fsw ft0, 8(sp)
; CHECK-RV32-F-NEXT: fsw ft1, 4(sp)
; CHECK-RV32-F-NEXT: lui a0, %hi(f)
; CHECK-RV32-F-NEXT: flw ft0, %lo(f)(a0)
; CHECK-RV32-F-NEXT: lui a0, %hi(e)
; CHECK-RV32-F-NEXT: flw ft1, %lo(e)(a0)
; CHECK-RV32-F-NEXT: fadd.s ft0, ft1, ft0
; CHECK-RV32-F-NEXT: lui a0, %hi(d)
; CHECK-RV32-F-NEXT: fsw ft0, %lo(d)(a0)
; CHECK-RV32-F-NEXT: flw ft1, 4(sp)
; CHECK-RV32-F-NEXT: flw ft0, 8(sp)
; CHECK-RV32-F-NEXT: lw a0, 12(sp)
; CHECK-RV32-F-NEXT: addi sp, sp, 16
; CHECK-RV32-F-NEXT: mret
;
%1 = load float, float* @e
%2 = load float, float* @f
%add = fadd float %1, %2
store float %add, float* @d
ret void
}
;
; Additionally check frame pointer and return address are properly saved.
;
define void @foo_fp_float() #1 {
; CHECK-RV32-F-LABEL: foo_fp_float:
; CHECK-RV32-F: # %bb.0:
; CHECK-RV32-F-NEXT: addi sp, sp, -32
; CHECK-RV32-F-NEXT: sw ra, 28(sp)
; CHECK-RV32-F-NEXT: sw s0, 24(sp)
; CHECK-RV32-F-NEXT: sw a0, 20(sp)
; CHECK-RV32-F-NEXT: fsw ft0, 16(sp)
; CHECK-RV32-F-NEXT: fsw ft1, 12(sp)
; CHECK-RV32-F-NEXT: addi s0, sp, 32
; CHECK-RV32-F-NEXT: lui a0, %hi(f)
; CHECK-RV32-F-NEXT: flw ft0, %lo(f)(a0)
; CHECK-RV32-F-NEXT: lui a0, %hi(e)
; CHECK-RV32-F-NEXT: flw ft1, %lo(e)(a0)
; CHECK-RV32-F-NEXT: fadd.s ft0, ft1, ft0
; CHECK-RV32-F-NEXT: lui a0, %hi(d)
; CHECK-RV32-F-NEXT: fsw ft0, %lo(d)(a0)
; CHECK-RV32-F-NEXT: flw ft1, 12(sp)
; CHECK-RV32-F-NEXT: flw ft0, 16(sp)
; CHECK-RV32-F-NEXT: lw a0, 20(sp)
; CHECK-RV32-F-NEXT: lw s0, 24(sp)
; CHECK-RV32-F-NEXT: lw ra, 28(sp)
; CHECK-RV32-F-NEXT: addi sp, sp, 32
; CHECK-RV32-F-NEXT: mret
;
%1 = load float, float* @e
%2 = load float, float* @f
%add = fadd float %1, %2
store float %add, float* @d
ret void
}
@h = external global double
@i = external global double
@g = external global double
define void @foo_double() #0 {
; CHECK-RV32-FD-LABEL: foo_double:
; CHECK-RV32-FD: # %bb.0:
; CHECK-RV32-FD-NEXT: addi sp, sp, -32
; CHECK-RV32-FD-NEXT: sw a0, 28(sp)
; CHECK-RV32-FD-NEXT: fsd ft0, 16(sp)
; CHECK-RV32-FD-NEXT: fsd ft1, 8(sp)
; CHECK-RV32-FD-NEXT: lui a0, %hi(i)
; CHECK-RV32-FD-NEXT: fld ft0, %lo(i)(a0)
; CHECK-RV32-FD-NEXT: lui a0, %hi(h)
; CHECK-RV32-FD-NEXT: fld ft1, %lo(h)(a0)
; CHECK-RV32-FD-NEXT: fadd.d ft0, ft1, ft0
; CHECK-RV32-FD-NEXT: lui a0, %hi(g)
; CHECK-RV32-FD-NEXT: fsd ft0, %lo(g)(a0)
; CHECK-RV32-FD-NEXT: fld ft1, 8(sp)
; CHECK-RV32-FD-NEXT: fld ft0, 16(sp)
; CHECK-RV32-FD-NEXT: lw a0, 28(sp)
; CHECK-RV32-FD-NEXT: addi sp, sp, 32
; CHECK-RV32-FD-NEXT: mret
;
%1 = load double, double* @h
%2 = load double, double* @i
%add = fadd double %1, %2
store double %add, double* @g
ret void
}
;
; Additionally check frame pointer and return address are properly saved.
;
define void @foo_fp_double() #1 {
; CHECK-RV32-FD-LABEL: foo_fp_double:
; CHECK-RV32-FD: # %bb.0:
; CHECK-RV32-FD-NEXT: addi sp, sp, -32
; CHECK-RV32-FD-NEXT: sw ra, 28(sp)
; CHECK-RV32-FD-NEXT: sw s0, 24(sp)
; CHECK-RV32-FD-NEXT: sw a0, 20(sp)
; CHECK-RV32-FD-NEXT: fsd ft0, 8(sp)
; CHECK-RV32-FD-NEXT: fsd ft1, 0(sp)
; CHECK-RV32-FD-NEXT: addi s0, sp, 32
; CHECK-RV32-FD-NEXT: lui a0, %hi(i)
; CHECK-RV32-FD-NEXT: fld ft0, %lo(i)(a0)
; CHECK-RV32-FD-NEXT: lui a0, %hi(h)
; CHECK-RV32-FD-NEXT: fld ft1, %lo(h)(a0)
; CHECK-RV32-FD-NEXT: fadd.d ft0, ft1, ft0
; CHECK-RV32-FD-NEXT: lui a0, %hi(g)
; CHECK-RV32-FD-NEXT: fsd ft0, %lo(g)(a0)
; CHECK-RV32-FD-NEXT: fld ft1, 0(sp)
; CHECK-RV32-FD-NEXT: fld ft0, 8(sp)
; CHECK-RV32-FD-NEXT: lw a0, 20(sp)
; CHECK-RV32-FD-NEXT: lw s0, 24(sp)
; CHECK-RV32-FD-NEXT: lw ra, 28(sp)
; CHECK-RV32-FD-NEXT: addi sp, sp, 32
; CHECK-RV32-FD-NEXT: mret
;
%1 = load double, double* @h
%2 = load double, double* @i
%add = fadd double %1, %2
store double %add, double* @g
ret void
}
attributes #0 = { "interrupt"="machine" }
attributes #1 = { "interrupt"="machine" "no-frame-pointer-elim"="true" }