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llvm-mirror/test/CodeGen/RISCV/codemodel-lowering.ll
Sam Elliott 1b981ebf72 [RISCV] Support Constant Pools in Load/Store Peephole
Summary:
RISC-V uses a post-select peephole pass to optimise
`(load/store (ADDI $reg, %lo(addr)), 0)` into `(load/store $reg, %lo(addr))`.
This peephole wasn't firing for accesses to constant pools, which is how we
materialise most floating point constants.

This adds support for the constantpool case, which improves code generation for
lots of small FP loading examples. I have not added any tests because this
structure is well-covered by the `fp-imm.ll` testcases, as well as almost
all other uses of floating point constants in the RISC-V backend tests.

Reviewed By: luismarques, asb

Differential Revision: https://reviews.llvm.org/D79523
2020-05-11 19:20:38 +01:00

154 lines
5.0 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv32 -mattr=+f -code-model=small -verify-machineinstrs < %s \
; RUN: | FileCheck %s -check-prefix=RV32I-SMALL
; RUN: llc -mtriple=riscv32 -mattr=+f -code-model=medium -verify-machineinstrs < %s \
; RUN: | FileCheck %s -check-prefix=RV32I-MEDIUM
; Check lowering of globals
@G = global i32 0
define i32 @lower_global(i32 %a) nounwind {
; RV32I-SMALL-LABEL: lower_global:
; RV32I-SMALL: # %bb.0:
; RV32I-SMALL-NEXT: lui a0, %hi(G)
; RV32I-SMALL-NEXT: lw a0, %lo(G)(a0)
; RV32I-SMALL-NEXT: ret
;
; RV32I-MEDIUM-LABEL: lower_global:
; RV32I-MEDIUM: # %bb.0:
; RV32I-MEDIUM-NEXT: .LBB0_1: # Label of block must be emitted
; RV32I-MEDIUM-NEXT: auipc a0, %pcrel_hi(G)
; RV32I-MEDIUM-NEXT: addi a0, a0, %pcrel_lo(.LBB0_1)
; RV32I-MEDIUM-NEXT: lw a0, 0(a0)
; RV32I-MEDIUM-NEXT: ret
%1 = load volatile i32, i32* @G
ret i32 %1
}
; Check lowering of blockaddresses
@addr = global i8* null
define void @lower_blockaddress() nounwind {
; RV32I-SMALL-LABEL: lower_blockaddress:
; RV32I-SMALL: # %bb.0:
; RV32I-SMALL-NEXT: lui a0, %hi(addr)
; RV32I-SMALL-NEXT: addi a1, zero, 1
; RV32I-SMALL-NEXT: sw a1, %lo(addr)(a0)
; RV32I-SMALL-NEXT: ret
;
; RV32I-MEDIUM-LABEL: lower_blockaddress:
; RV32I-MEDIUM: # %bb.0:
; RV32I-MEDIUM-NEXT: .LBB1_1: # Label of block must be emitted
; RV32I-MEDIUM-NEXT: auipc a0, %pcrel_hi(addr)
; RV32I-MEDIUM-NEXT: addi a0, a0, %pcrel_lo(.LBB1_1)
; RV32I-MEDIUM-NEXT: addi a1, zero, 1
; RV32I-MEDIUM-NEXT: sw a1, 0(a0)
; RV32I-MEDIUM-NEXT: ret
store volatile i8* blockaddress(@lower_blockaddress, %block), i8** @addr
ret void
block:
unreachable
}
; Check lowering of blockaddress that forces a displacement to be added
define signext i32 @lower_blockaddress_displ(i32 signext %w) nounwind {
; RV32I-SMALL-LABEL: lower_blockaddress_displ:
; RV32I-SMALL: # %bb.0: # %entry
; RV32I-SMALL-NEXT: addi sp, sp, -16
; RV32I-SMALL-NEXT: sw ra, 12(sp)
; RV32I-SMALL-NEXT: lui a1, %hi(.Ltmp0)
; RV32I-SMALL-NEXT: addi a1, a1, %lo(.Ltmp0)
; RV32I-SMALL-NEXT: addi a2, zero, 101
; RV32I-SMALL-NEXT: sw a1, 8(sp)
; RV32I-SMALL-NEXT: blt a0, a2, .LBB2_3
; RV32I-SMALL-NEXT: # %bb.1: # %if.then
; RV32I-SMALL-NEXT: lw a0, 8(sp)
; RV32I-SMALL-NEXT: jr a0
; RV32I-SMALL-NEXT: .Ltmp0: # Block address taken
; RV32I-SMALL-NEXT: .LBB2_2: # %return
; RV32I-SMALL-NEXT: addi a0, zero, 4
; RV32I-SMALL-NEXT: j .LBB2_4
; RV32I-SMALL-NEXT: .LBB2_3: # %return.clone
; RV32I-SMALL-NEXT: addi a0, zero, 3
; RV32I-SMALL-NEXT: .LBB2_4: # %.split
; RV32I-SMALL-NEXT: lw ra, 12(sp)
; RV32I-SMALL-NEXT: addi sp, sp, 16
; RV32I-SMALL-NEXT: ret
;
; RV32I-MEDIUM-LABEL: lower_blockaddress_displ:
; RV32I-MEDIUM: # %bb.0: # %entry
; RV32I-MEDIUM-NEXT: addi sp, sp, -16
; RV32I-MEDIUM-NEXT: sw ra, 12(sp)
; RV32I-MEDIUM-NEXT: .LBB2_5: # %entry
; RV32I-MEDIUM-NEXT: # Label of block must be emitted
; RV32I-MEDIUM-NEXT: auipc a1, %pcrel_hi(.Ltmp0)
; RV32I-MEDIUM-NEXT: addi a1, a1, %pcrel_lo(.LBB2_5)
; RV32I-MEDIUM-NEXT: addi a2, zero, 101
; RV32I-MEDIUM-NEXT: sw a1, 8(sp)
; RV32I-MEDIUM-NEXT: blt a0, a2, .LBB2_3
; RV32I-MEDIUM-NEXT: # %bb.1: # %if.then
; RV32I-MEDIUM-NEXT: lw a0, 8(sp)
; RV32I-MEDIUM-NEXT: jr a0
; RV32I-MEDIUM-NEXT: .Ltmp0: # Block address taken
; RV32I-MEDIUM-NEXT: .LBB2_2: # %return
; RV32I-MEDIUM-NEXT: addi a0, zero, 4
; RV32I-MEDIUM-NEXT: j .LBB2_4
; RV32I-MEDIUM-NEXT: .LBB2_3: # %return.clone
; RV32I-MEDIUM-NEXT: addi a0, zero, 3
; RV32I-MEDIUM-NEXT: .LBB2_4: # %.split
; RV32I-MEDIUM-NEXT: lw ra, 12(sp)
; RV32I-MEDIUM-NEXT: addi sp, sp, 16
; RV32I-MEDIUM-NEXT: ret
entry:
%x = alloca i8*, align 8
store i8* blockaddress(@lower_blockaddress_displ, %test_block), i8** %x, align 8
%cmp = icmp sgt i32 %w, 100
br i1 %cmp, label %if.then, label %if.end
if.then:
%addr = load i8*, i8** %x, align 8
br label %indirectgoto
if.end:
br label %return
test_block:
br label %return
return:
%retval = phi i32 [ 3, %if.end ], [ 4, %test_block ]
ret i32 %retval
indirectgoto:
indirectbr i8* %addr, [ label %test_block ]
}
; Check lowering of constantpools
define float @lower_constantpool(float %a) nounwind {
; RV32I-SMALL-LABEL: lower_constantpool:
; RV32I-SMALL: # %bb.0:
; RV32I-SMALL-NEXT: lui a1, %hi(.LCPI3_0)
; RV32I-SMALL-NEXT: flw ft0, %lo(.LCPI3_0)(a1)
; RV32I-SMALL-NEXT: fmv.w.x ft1, a0
; RV32I-SMALL-NEXT: fadd.s ft0, ft1, ft0
; RV32I-SMALL-NEXT: fmv.x.w a0, ft0
; RV32I-SMALL-NEXT: ret
;
; RV32I-MEDIUM-LABEL: lower_constantpool:
; RV32I-MEDIUM: # %bb.0:
; RV32I-MEDIUM-NEXT: .LBB3_1: # Label of block must be emitted
; RV32I-MEDIUM-NEXT: auipc a1, %pcrel_hi(.LCPI3_0)
; RV32I-MEDIUM-NEXT: addi a1, a1, %pcrel_lo(.LBB3_1)
; RV32I-MEDIUM-NEXT: flw ft0, 0(a1)
; RV32I-MEDIUM-NEXT: fmv.w.x ft1, a0
; RV32I-MEDIUM-NEXT: fadd.s ft0, ft1, ft0
; RV32I-MEDIUM-NEXT: fmv.x.w a0, ft0
; RV32I-MEDIUM-NEXT: ret
%1 = fadd float %a, 1.0
ret float %1
}