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llvm-project/llvm/test/CodeGen/ARM/dsp-loop-indexing.ll

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[LSR] Generate cross iteration indexes Modify GenerateConstantOffsetsImpl to create offsets that can be used by indexed addressing modes. If formulae can be generated which result in the constant offset being the same size as the recurrence, we can generate a pre-indexed access. This allows the pointer to be updated via the single pre-indexed access so that (hopefully) no add/subs are required to update it for the next iteration. For small cores, this can significantly improve performance DSP-like loops. Differential Revision: https://reviews.llvm.org/D55373 llvm-svn: 353403
2019-02-07 21:32:54 +08:00
; RUN: llc -mtriple=thumbv7em -mattr=+fp-armv8 %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-DEFAULT
; RUN: llc -mtriple=thumbv8m.main -mattr=+fp-armv8,+dsp %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-DEFAULT
; RUN: llc -mtriple=thumbv8m.main -mattr=+fp-armv8,+dsp -lsr-backedge-indexing=false %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLED
; RUN: llc -mtriple=thumbv8 %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=DISABLED
; RUN: llc -mtriple=thumbv8m.main -mattr=+fp-armv8,+dsp -lsr-complexity-limit=2147483647 %s -o - | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-COMPLEX
; CHECK-LABEL: test_qadd_2
; CHECK: @ %loop
; CHECK-DEFAULT: ldr{{.*}}, #4]
; CHECK-DEFAULT: ldr{{.*}}, #4]
; CHECK-DEFAULT: str{{.*}}, #4]
; CHECK-DEFAULT: ldr{{.*}}, #8]!
; CHECK-DEAFULT: ldr{{.*}}, #8]!
; CHECK-DEFAULT: str{{.*}}, #8]!
; CHECK-COMPLEX: ldr{{.*}}, #8]!
; CHECK-COMPLEX: ldr{{.*}}, #8]!
; CHECK-COMPLEX: str{{.*}}, #8]!
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: str{{.*}}, #4]
; DISABLED-NOT: ldr{{.*}}]!
; DISABLED-NOT: str{{.*}}]!
define void @test_qadd_2(i32* %a.array, i32* %b.array, i32* %out.array, i32 %N) {
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%idx.1 = phi i32 [ 0, %entry ], [ %idx.next, %loop ]
%gep.a.1 = getelementptr inbounds i32, i32* %a.array, i32 %idx.1
%a.1 = load i32, i32* %gep.a.1
%gep.b.1 = getelementptr inbounds i32, i32* %b.array, i32 %idx.1
%b.1 = load i32, i32* %gep.b.1
%qadd.1 = call i32 @llvm.arm.qadd(i32 %a.1, i32 %b.1)
%addr.1 = getelementptr inbounds i32, i32* %out.array, i32 %idx.1
store i32 %qadd.1, i32* %addr.1
%idx.2 = or i32 %idx.1, 1
%gep.a.2 = getelementptr inbounds i32, i32* %a.array, i32 %idx.2
%a.2 = load i32, i32* %gep.a.2
%gep.b.2 = getelementptr inbounds i32, i32* %b.array, i32 %idx.2
%b.2 = load i32, i32* %gep.b.2
%qadd.2 = call i32 @llvm.arm.qadd(i32 %a.2, i32 %b.2)
%addr.2 = getelementptr inbounds i32, i32* %out.array, i32 %idx.2
store i32 %qadd.2, i32* %addr.2
%i.next = add nsw nuw i32 %i, -2
%idx.next = add nsw nuw i32 %idx.1, 2
%cmp = icmp ult i32 %i.next, %N
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
; CHECK-LABEL: test_qadd_2_backwards
; TODO: Indexes should be generated.
; CHECK: @ %loop
; CHECK-DEFAULT: ldr{{.*}},
; CHECK-DEFAULT: ldr{{.*}},
; CHECK-DEFAULT: str{{.*}},
; CHECK-DEFAULT: ldr{{.*}}, #-4]
; CHECK-DEFAULT: ldr{{.*}}, #-4]
; CHECK-DEFAULT: sub{{.*}}, #8
; CHECK-DEFAULT: str{{.*}}, #-4]
; CHECK-DEFAULT: sub{{.*}}, #8
; CHECK-COMPLEX: ldr{{.*}} lsl #2]
; CHECK-COMPLEX: ldr{{.*}} lsl #2]
; CHECK-COMPLEX: str{{.*}} lsl #2]
; CHECK-COMPLEX: ldr{{.*}} lsl #2]
; CHECK-COMPLEX: ldr{{.*}} lsl #2]
; CHECK-COMPLEX: str{{.*}} lsl #2]
; DISABLED-NOT: ldr{{.*}}]!
; DISABLED-NOT: str{{.*}}]!
define void @test_qadd_2_backwards(i32* %a.array, i32* %b.array, i32* %out.array, i32 %N) {
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%idx.1 = phi i32 [ %N, %entry ], [ %idx.next, %loop ]
%gep.a.1 = getelementptr inbounds i32, i32* %a.array, i32 %idx.1
%a.1 = load i32, i32* %gep.a.1
%gep.b.1 = getelementptr inbounds i32, i32* %b.array, i32 %idx.1
%b.1 = load i32, i32* %gep.b.1
%qadd.1 = call i32 @llvm.arm.qadd(i32 %a.1, i32 %b.1)
%addr.1 = getelementptr inbounds i32, i32* %out.array, i32 %idx.1
store i32 %qadd.1, i32* %addr.1
%idx.2 = sub nsw nuw i32 %idx.1, 1
%gep.a.2 = getelementptr inbounds i32, i32* %a.array, i32 %idx.2
%a.2 = load i32, i32* %gep.a.2
%gep.b.2 = getelementptr inbounds i32, i32* %b.array, i32 %idx.2
%b.2 = load i32, i32* %gep.b.2
%qadd.2 = call i32 @llvm.arm.qadd(i32 %a.2, i32 %b.2)
%addr.2 = getelementptr inbounds i32, i32* %out.array, i32 %idx.2
store i32 %qadd.2, i32* %addr.2
%i.next = add nsw nuw i32 %i, -2
%idx.next = sub nsw nuw i32 %idx.1, 2
%cmp = icmp ult i32 %i.next, %N
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
; CHECK-LABEL: test_qadd_3
; CHECK: @ %loop
; CHECK-DEFAULT: ldr{{.*}}, #8]
; CHECK-DEFAULT: ldr{{.*}}, #8]
; CHECK-DEFAULT: str{{.*}}, #8]
; CHECK-DEFAULT: ldr{{.*}}, #12]!
; CHECK-DEFAULT: ldr{{.*}}, #12]!
; CHECK-DEFAULT: str{{.*}}, #12]!
; CHECK-COMPLEX: ldr{{.*}}, #12]!
; CHECK-COMPLEX: ldr{{.*}}, #12]!
; CHECK-COMPLEX: str{{.*}}, #12]!
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: str{{.*}}, #4]
; CHECK-COMPLEX: ldr{{.*}}, #8]
; CHECK-COMPLEX: ldr{{.*}}, #8]
; CHECK-COMPLEX: str{{.*}}, #8]
; DISABLED-NOT: ldr{{.*}}]!
; DISABLED-NOT: str{{.*}}]!
define void @test_qadd_3(i32* %a.array, i32* %b.array, i32* %out.array, i32 %N) {
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%idx.1 = phi i32 [ 0, %entry ], [ %idx.next, %loop ]
%gep.a.1 = getelementptr inbounds i32, i32* %a.array, i32 %idx.1
%a.1 = load i32, i32* %gep.a.1
%gep.b.1 = getelementptr inbounds i32, i32* %b.array, i32 %idx.1
%b.1 = load i32, i32* %gep.b.1
%qadd.1 = call i32 @llvm.arm.qadd(i32 %a.1, i32 %b.1)
%addr.1 = getelementptr inbounds i32, i32* %out.array, i32 %idx.1
store i32 %qadd.1, i32* %addr.1
%idx.2 = add nuw nsw i32 %idx.1, 1
%gep.a.2 = getelementptr inbounds i32, i32* %a.array, i32 %idx.2
%a.2 = load i32, i32* %gep.a.2
%gep.b.2 = getelementptr inbounds i32, i32* %b.array, i32 %idx.2
%b.2 = load i32, i32* %gep.b.2
%qadd.2 = call i32 @llvm.arm.qadd(i32 %a.2, i32 %b.2)
%addr.2 = getelementptr inbounds i32, i32* %out.array, i32 %idx.2
store i32 %qadd.2, i32* %addr.2
%idx.3 = add nuw nsw i32 %idx.1, 2
%gep.a.3 = getelementptr inbounds i32, i32* %a.array, i32 %idx.3
%a.3 = load i32, i32* %gep.a.3
%gep.b.3 = getelementptr inbounds i32, i32* %b.array, i32 %idx.3
%b.3 = load i32, i32* %gep.b.3
%qadd.3 = call i32 @llvm.arm.qadd(i32 %a.3, i32 %b.3)
%addr.3 = getelementptr inbounds i32, i32* %out.array, i32 %idx.3
store i32 %qadd.3, i32* %addr.3
%i.next = add nsw nuw i32 %i, -3
%idx.next = add nsw nuw i32 %idx.1, 3
%cmp = icmp ult i32 %i.next, %N
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
; CHECK-LABEL: test_qadd_4
; CHECK: @ %loop
; TODO: pre-inc store
; CHECK-DEFAULT: ldr{{.*}}, #4]
; CHECK-DEFAULT: ldr{{.*}}, #4]
; CHECK-DEFAULT: str{{.*}}, #4]
; CHECK-DEFAULT: ldr{{.*}}, #8]
; CHECK-DEFAULT: ldr{{.*}}, #8]
; CHECK-DEFAULT: str{{.*}}, #8]
; CHECK-DEFAULT: ldr{{.*}}, #12]
; CHECK-DEFAULT: ldr{{.*}}, #12]
; CHECK-DEFAULT: str{{.*}}, #12]
; CHECK-COMPLEX: ldr{{.*}}, #16]!
; CHECK-COMPLEX: ldr{{.*}}, #16]!
; CHECK-COMPLEX: str{{.*}}, #16]!
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: str{{.*}}, #4]
; CHECK-COMPLEX: ldr{{.*}}, #8]
; CHECK-COMPLEX: ldr{{.*}}, #8]
; CHECK-COMPLEX: str{{.*}}, #8]
; CHECK-COMPLEX: ldr{{.*}}, #12]
; CHECK-COMPLEX: ldr{{.*}}, #12]
; CHECK-COMPLEX: str{{.*}}, #12]
; DISABLED-NOT: ldr{{.*}}]!
; DISABLED-NOT: str{{.*}}]!
define void @test_qadd_4(i32* %a.array, i32* %b.array, i32* %out.array, i32 %N) {
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%idx.1 = phi i32 [ 0, %entry ], [ %idx.next, %loop ]
%gep.a.1 = getelementptr inbounds i32, i32* %a.array, i32 %idx.1
%a.1 = load i32, i32* %gep.a.1
%gep.b.1 = getelementptr inbounds i32, i32* %b.array, i32 %idx.1
%b.1 = load i32, i32* %gep.b.1
%qadd.1 = call i32 @llvm.arm.qadd(i32 %a.1, i32 %b.1)
%addr.1 = getelementptr inbounds i32, i32* %out.array, i32 %idx.1
store i32 %qadd.1, i32* %addr.1
%idx.2 = or i32 %idx.1, 1
%gep.a.2 = getelementptr inbounds i32, i32* %a.array, i32 %idx.2
%a.2 = load i32, i32* %gep.a.2
%gep.b.2 = getelementptr inbounds i32, i32* %b.array, i32 %idx.2
%b.2 = load i32, i32* %gep.b.2
%qadd.2 = call i32 @llvm.arm.qadd(i32 %a.2, i32 %b.2)
%addr.2 = getelementptr inbounds i32, i32* %out.array, i32 %idx.2
store i32 %qadd.2, i32* %addr.2
%idx.3 = or i32 %idx.1, 2
%gep.a.3 = getelementptr inbounds i32, i32* %a.array, i32 %idx.3
%a.3 = load i32, i32* %gep.a.3
%gep.b.3 = getelementptr inbounds i32, i32* %b.array, i32 %idx.3
%b.3 = load i32, i32* %gep.b.3
%qadd.3 = call i32 @llvm.arm.qadd(i32 %a.3, i32 %b.3)
%addr.3 = getelementptr inbounds i32, i32* %out.array, i32 %idx.3
store i32 %qadd.3, i32* %addr.3
%idx.4 = or i32 %idx.1, 3
%gep.a.4 = getelementptr inbounds i32, i32* %a.array, i32 %idx.4
%a.4 = load i32, i32* %gep.a.4
%gep.b.4 = getelementptr inbounds i32, i32* %b.array, i32 %idx.4
%b.4 = load i32, i32* %gep.b.4
%qadd.4 = call i32 @llvm.arm.qadd(i32 %a.4, i32 %b.4)
%addr.4 = getelementptr inbounds i32, i32* %out.array, i32 %idx.4
store i32 %qadd.4, i32* %addr.4
%i.next = add nsw nuw i32 %i, -4
%idx.next = add nsw nuw i32 %idx.1, 4
%cmp = icmp ult i32 %i.next, %N
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
; CHECK-LABEL: test_qadd16_2
; CHECK: @ %loop
; TODO: pre-inc store.
; CHECK-DEFAULT: ldr{{.*}}, #4]
; CHECK-DEFAULT: ldr{{.*}}, #4]
; CHECK-DEFAULT: str{{.*}}, #8]
; CHECK-DEFAULT: ldr{{.*}}, #8]!
; CHECK-DEFAULT: ldr{{.*}}, #8]!
; CHECK-DEFAULT: str{{.*}}, #16]!
; CHECK-COMPLEX: ldr{{.*}}, #8]!
; CHECK-COMPLEX: ldr{{.*}}, #8]!
; CHECK-COMPLEX: str{{.*}}, #16]!
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: ldr{{.*}}, #4]
; CHECK-COMPLEX: str{{.*}}, #8]
; DISABLED-NOT: ldr{{.*}}]!
; DISABLED-NOT: str{{.*}}]!
define void @test_qadd16_2(i16* %a.array, i16* %b.array, i32* %out.array, i32 %N) {
entry:
br label %loop
loop:
%i = phi i32 [ 0, %entry ], [ %i.next, %loop ]
%idx.1 = phi i32 [ 0, %entry ], [ %idx.next, %loop ]
%gep.a.1 = getelementptr inbounds i16, i16* %a.array, i32 %idx.1
%cast.a.1 = bitcast i16* %gep.a.1 to i32*
%a.1 = load i32, i32* %cast.a.1
%gep.b.1 = getelementptr inbounds i16, i16* %b.array, i32 %idx.1
%cast.b.1 = bitcast i16* %gep.b.1 to i32*
%b.1 = load i32, i32* %cast.b.1
%qadd.1 = call i32 @llvm.arm.qadd16(i32 %a.1, i32 %b.1)
%addr.1 = getelementptr inbounds i32, i32* %out.array, i32 %idx.1
store i32 %qadd.1, i32* %addr.1
%idx.2 = add nsw nuw i32 %idx.1, 2
%gep.a.2 = getelementptr inbounds i16, i16* %a.array, i32 %idx.2
%cast.a.2 = bitcast i16* %gep.a.2 to i32*
%a.2 = load i32, i32* %cast.a.2
%gep.b.2 = getelementptr inbounds i16, i16* %b.array, i32 %idx.2
%cast.b.2 = bitcast i16* %gep.b.2 to i32*
%b.2 = load i32, i32* %cast.b.2
%qadd.2 = call i32 @llvm.arm.qadd16(i32 %a.2, i32 %b.2)
%addr.2 = getelementptr inbounds i32, i32* %out.array, i32 %idx.2
store i32 %qadd.2, i32* %addr.2
%i.next = add nsw nuw i32 %i, -2
%idx.next = add nsw nuw i32 %idx.1, 4
%cmp = icmp ult i32 %i.next, %N
br i1 %cmp, label %loop, label %exit
exit:
ret void
}
declare i32 @llvm.arm.qadd(i32, i32)
declare i32 @llvm.arm.qadd16(i32, i32)