54e5de08d4
Extra uses for variables outside the loop can mess with the generation of postinc variables. This patch alters the collection of loop invariant fixups in LSR when the target is optimizing for PostInc, to exclude the collection of these extra uses. It is expected that the variable can be rematerialized, which will lead to a more optimal sequence of instructions in the loop.
138 lines
5.4 KiB
LLVM
138 lines
5.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
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; RUN: llc -mtriple=thumbv8.1m.main-none-none-eabi -mattr=+mve.fp %s -o - | FileCheck %s
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define nonnull ptr @useafterloop(ptr nocapture noundef readonly %pSrcA, ptr nocapture noundef readonly %pSrcB, ptr noundef writeonly %pDst, i32 noundef %blockSize) {
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; CHECK-LABEL: useafterloop:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: mov.w lr, #64
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; CHECK-NEXT: mov r3, r2
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; CHECK-NEXT: .LBB0_1: @ %while.body
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: vldrw.u32 q0, [r0], #16
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; CHECK-NEXT: vldrw.u32 q1, [r1], #16
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; CHECK-NEXT: vadd.f32 q0, q1, q0
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; CHECK-NEXT: vstrb.8 q0, [r3], #16
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; CHECK-NEXT: le lr, .LBB0_1
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; CHECK-NEXT: @ %bb.2: @ %while.end
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; CHECK-NEXT: mov r0, r2
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; CHECK-NEXT: pop {r7, pc}
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entry:
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br label %while.body
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while.body:
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%pSrcA.addr.012 = phi ptr [ %pSrcA, %entry ], [ %add.ptr, %while.body ]
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%pSrcB.addr.011 = phi ptr [ %pSrcB, %entry ], [ %add.ptr1, %while.body ]
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%pDst.addr.010 = phi ptr [ %pDst, %entry ], [ %add.ptr2, %while.body ]
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%blkCnt.09 = phi i32 [ 64, %entry ], [ %dec, %while.body ]
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%0 = load <4 x float>, ptr %pSrcA.addr.012, align 4
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%1 = load <4 x float>, ptr %pSrcB.addr.011, align 4
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%2 = fadd fast <4 x float> %1, %0
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store <4 x float> %2, ptr %pDst.addr.010, align 4
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%add.ptr = getelementptr inbounds float, ptr %pSrcA.addr.012, i32 4
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%add.ptr1 = getelementptr inbounds float, ptr %pSrcB.addr.011, i32 4
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%add.ptr2 = getelementptr inbounds float, ptr %pDst.addr.010, i32 4
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%dec = add nsw i32 %blkCnt.09, -1
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%cmp.not = icmp eq i32 %dec, 0
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br i1 %cmp.not, label %while.end, label %while.body
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while.end:
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ret ptr %pDst
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}
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define nonnull ptr @nouse(ptr nocapture noundef readonly %pSrcA, ptr nocapture noundef readonly %pSrcB, ptr noundef writeonly %pDst, i32 noundef %blockSize) {
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; CHECK-LABEL: nouse:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r7, lr}
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; CHECK-NEXT: push {r7, lr}
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; CHECK-NEXT: mov.w lr, #64
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; CHECK-NEXT: mov r3, r2
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; CHECK-NEXT: .LBB1_1: @ %while.body
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: vldrw.u32 q0, [r0], #16
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; CHECK-NEXT: vldrw.u32 q1, [r1], #16
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; CHECK-NEXT: vadd.f32 q0, q1, q0
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; CHECK-NEXT: vstrb.8 q0, [r3], #16
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; CHECK-NEXT: le lr, .LBB1_1
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; CHECK-NEXT: @ %bb.2: @ %while.end
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; CHECK-NEXT: adds r0, r2, #4
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; CHECK-NEXT: pop {r7, pc}
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entry:
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br label %while.body
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while.body:
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%pSrcA.addr.012 = phi ptr [ %pSrcA, %entry ], [ %add.ptr, %while.body ]
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%pSrcB.addr.011 = phi ptr [ %pSrcB, %entry ], [ %add.ptr1, %while.body ]
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%pDst.addr.010 = phi ptr [ %pDst, %entry ], [ %add.ptr2, %while.body ]
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%blkCnt.09 = phi i32 [ 64, %entry ], [ %dec, %while.body ]
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%0 = load <4 x float>, ptr %pSrcA.addr.012, align 4
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%1 = load <4 x float>, ptr %pSrcB.addr.011, align 4
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%2 = fadd fast <4 x float> %1, %0
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store <4 x float> %2, ptr %pDst.addr.010, align 4
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%add.ptr = getelementptr inbounds float, ptr %pSrcA.addr.012, i32 4
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%add.ptr1 = getelementptr inbounds float, ptr %pSrcB.addr.011, i32 4
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%add.ptr2 = getelementptr inbounds float, ptr %pDst.addr.010, i32 4
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%dec = add nsw i32 %blkCnt.09, -1
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%cmp.not = icmp eq i32 %dec, 0
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br i1 %cmp.not, label %while.end, label %while.body
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while.end:
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%add.ptr3 = getelementptr inbounds float, ptr %pDst, i32 1
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ret ptr %add.ptr3
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}
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define nofpclass(nan inf) float @manyusesafterloop(ptr nocapture noundef readonly %pSrcA, ptr nocapture noundef readonly %pSrcB, ptr nocapture noundef %pDst, i32 noundef %blockSize) {
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; CHECK-LABEL: manyusesafterloop:
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; CHECK: @ %bb.0: @ %entry
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; CHECK-NEXT: .save {r4, lr}
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; CHECK-NEXT: push {r4, lr}
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; CHECK-NEXT: mov.w lr, #64
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; CHECK-NEXT: mov r12, r0
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; CHECK-NEXT: mov r3, r1
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; CHECK-NEXT: mov r4, r2
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; CHECK-NEXT: .LBB2_1: @ %while.body
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; CHECK-NEXT: @ =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: vldrw.u32 q0, [r12], #16
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; CHECK-NEXT: vldrw.u32 q1, [r3], #16
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; CHECK-NEXT: vadd.f32 q0, q1, q0
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; CHECK-NEXT: vstrb.8 q0, [r4], #16
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; CHECK-NEXT: le lr, .LBB2_1
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; CHECK-NEXT: @ %bb.2: @ %while.end
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; CHECK-NEXT: vldr s0, [r2]
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; CHECK-NEXT: vldr s2, [r0]
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; CHECK-NEXT: vadd.f32 s0, s2, s0
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; CHECK-NEXT: vldr s2, [r1]
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; CHECK-NEXT: vadd.f32 s0, s0, s2
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; CHECK-NEXT: vmov r0, s0
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; CHECK-NEXT: pop {r4, pc}
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entry:
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br label %while.body
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while.body:
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%pSrcA.addr.016 = phi ptr [ %pSrcA, %entry ], [ %add.ptr, %while.body ]
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%pSrcB.addr.015 = phi ptr [ %pSrcB, %entry ], [ %add.ptr1, %while.body ]
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%pDst.addr.014 = phi ptr [ %pDst, %entry ], [ %add.ptr2, %while.body ]
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%blkCnt.013 = phi i32 [ 64, %entry ], [ %dec, %while.body ]
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%0 = load <4 x float>, ptr %pSrcA.addr.016, align 4
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%1 = load <4 x float>, ptr %pSrcB.addr.015, align 4
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%2 = fadd fast <4 x float> %1, %0
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store <4 x float> %2, ptr %pDst.addr.014, align 4
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%add.ptr = getelementptr inbounds float, ptr %pSrcA.addr.016, i32 4
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%add.ptr1 = getelementptr inbounds float, ptr %pSrcB.addr.015, i32 4
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%add.ptr2 = getelementptr inbounds float, ptr %pDst.addr.014, i32 4
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%dec = add nsw i32 %blkCnt.013, -1
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%cmp.not = icmp eq i32 %dec, 0
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br i1 %cmp.not, label %while.end, label %while.body
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while.end:
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%3 = load float, ptr %pDst, align 4
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%4 = load float, ptr %pSrcA, align 4
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%add = fadd fast float %4, %3
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%5 = load float, ptr %pSrcB, align 4
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%add5 = fadd fast float %add, %5
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ret float %add5
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}
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