73a6cd4b6b
This hints the operand of a t2DoLoopStart towards using LR, which can help make it more likely to become t2DLS lr, lr. This makes it easier to move if needed (as the input is the same as the output), or potentially remove entirely. The hint is added after others (from COPY's etc) which still take precedence. It needed to find a place to add the hint, which currently uses the post isel custom inserter. Differential Revision: https://reviews.llvm.org/D89883
62 lines
1.9 KiB
LLVM
62 lines
1.9 KiB
LLVM
; RUN: llc -mtriple=thumbv8.1m.main-none-none-eabi -mattr=+lob,+mve.fp -disable-arm-loloops=true %s -o - | FileCheck %s --check-prefix=DISABLED
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; RUN: llc -mtriple=thumbv8.1m.main-none-none-eabi -mattr=+lob,+mve.fp %s -o - | FileCheck %s
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; DISABLED-NOT: dls lr,
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; CHECK-LABEL: test_target_specific:
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; CHECK: mov.w lr, #50
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; CHECK: dls lr, lr
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; CHECK-NOT: mov lr,
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; CHECK: [[LOOP_HEADER:\.LBB[0-9_]+]]:
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; CHECK: le lr, [[LOOP_HEADER]]
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; CHECK-NOT: b .
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; CHECK: @ %exit
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define i32 @test_target_specific(i32* %a, i32* %b) {
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entry:
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br label %loop
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loop:
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%acc = phi i32 [ 0, %entry ], [ %res, %loop ]
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%count = phi i32 [ 0, %entry ], [ %count.next, %loop ]
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%addr.a = getelementptr i32, i32* %a, i32 %count
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%addr.b = getelementptr i32, i32* %b, i32 %count
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%load.a = load i32, i32* %addr.a
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%load.b = load i32, i32* %addr.b
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%res = call i32 @llvm.arm.smlad(i32 %load.a, i32 %load.b, i32 %acc)
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%count.next = add nuw i32 %count, 2
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%cmp = icmp ne i32 %count.next, 100
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br i1 %cmp, label %loop, label %exit
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exit:
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ret i32 %res
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}
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; CHECK-LABEL: test_fabs:
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; CHECK: mov.w lr, #100
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; CHECK: dls lr, lr
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; CHECK-NOT: mov lr,
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; CHECK: [[LOOP_HEADER:\.LBB[0-9_]+]]:
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; CHECK-NOT: bl
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; CHECK: le lr, [[LOOP_HEADER]]
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; CHECK-NOT: b .
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; CHECK: @ %exit
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define float @test_fabs(float* %a) {
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entry:
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br label %loop
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loop:
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%acc = phi float [ 0.0, %entry ], [ %res, %loop ]
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%count = phi i32 [ 0, %entry ], [ %count.next, %loop ]
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%addr.a = getelementptr float, float* %a, i32 %count
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%load.a = load float, float* %addr.a
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%abs = call float @llvm.fabs.f32(float %load.a)
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%res = fadd float %abs, %acc
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%count.next = add nuw i32 %count, 1
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%cmp = icmp ne i32 %count.next, 100
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br i1 %cmp, label %loop, label %exit
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exit:
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ret float %res
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}
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declare i32 @llvm.arm.smlad(i32, i32, i32)
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declare float @llvm.fabs.f32(float)
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