bd07c2e266
This changes the lowering of f32 and f64 COPY from a 128bit vector ORR to a fmov of the appropriate type. At least on some CPU's with 64bit NEON data paths this is expected to be faster, and shouldn't be slower on any CPU that treats fmov as a register rename. Differential Revision: https://reviews.llvm.org/D106365
108 lines
4.0 KiB
LLVM
108 lines
4.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=aarch64-unknown-unknown | FileCheck %s
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; Test LSR for giving small constants, which get re-associated as unfolded
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; offset, a chance to get combined with loop-invariant registers (same as
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; large constants which do not fit as add immediate operands). LSR
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; favors here to bump the base pointer outside the loop.
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; float test(float *arr, long long start, float threshold) {
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; for (long long i = start; i != 0; ++i) {
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; float x = arr[i + 7];
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; if (x > threshold)
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; return x;
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; }
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; return -7;
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; }
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define float @test1(float* nocapture readonly %arr, i64 %start, float %threshold) {
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; CHECK-LABEL: test1:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: cbz x1, .LBB0_4
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; CHECK-NEXT: // %bb.1: // %for.body.preheader
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; CHECK-NEXT: add x8, x0, #28
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; CHECK-NEXT: .LBB0_2: // %for.body
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; CHECK-NEXT: // =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: ldr s1, [x8, x1, lsl #2]
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; CHECK-NEXT: fcmp s1, s0
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; CHECK-NEXT: b.gt .LBB0_5
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; CHECK-NEXT: // %bb.3: // %for.cond
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; CHECK-NEXT: // in Loop: Header=BB0_2 Depth=1
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; CHECK-NEXT: add x1, x1, #1
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; CHECK-NEXT: cbnz x1, .LBB0_2
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; CHECK-NEXT: .LBB0_4:
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; CHECK-NEXT: fmov s0, #-7.00000000
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB0_5: // %cleanup2
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; CHECK-NEXT: fmov s0, s1
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; CHECK-NEXT: ret
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entry:
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%cmp11 = icmp eq i64 %start, 0
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br i1 %cmp11, label %cleanup2, label %for.body
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for.cond: ; preds = %for.body
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%cmp = icmp eq i64 %inc, 0
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br i1 %cmp, label %cleanup2, label %for.body
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for.body: ; preds = %entry, %for.cond
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%i.012 = phi i64 [ %inc, %for.cond ], [ %start, %entry ]
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%add = add nsw i64 %i.012, 7
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%arrayidx = getelementptr inbounds float, float* %arr, i64 %add
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%0 = load float, float* %arrayidx, align 4
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%cmp1 = fcmp ogt float %0, %threshold
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%inc = add nsw i64 %i.012, 1
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br i1 %cmp1, label %cleanup2, label %for.cond
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cleanup2: ; preds = %for.cond, %for.body, %entry
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%1 = phi float [ -7.000000e+00, %entry ], [ %0, %for.body ], [ -7.000000e+00, %for.cond ]
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ret float %1
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}
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; Same as test1, except i has another use:
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; if (x > threshold) ---> if (x > threshold + i)
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define float @test2(float* nocapture readonly %arr, i64 %start, float %threshold) {
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; CHECK-LABEL: test2:
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; CHECK: // %bb.0: // %entry
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; CHECK-NEXT: cbz x1, .LBB1_4
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; CHECK-NEXT: // %bb.1: // %for.body.preheader
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; CHECK-NEXT: add x8, x0, #28
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; CHECK-NEXT: .LBB1_2: // %for.body
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; CHECK-NEXT: // =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: ldr s1, [x8, x1, lsl #2]
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; CHECK-NEXT: scvtf s2, x1
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; CHECK-NEXT: fadd s2, s2, s0
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; CHECK-NEXT: fcmp s1, s2
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; CHECK-NEXT: b.gt .LBB1_5
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; CHECK-NEXT: // %bb.3: // %for.cond
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; CHECK-NEXT: // in Loop: Header=BB1_2 Depth=1
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; CHECK-NEXT: add x1, x1, #1
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; CHECK-NEXT: cbnz x1, .LBB1_2
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; CHECK-NEXT: .LBB1_4:
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; CHECK-NEXT: fmov s0, #-7.00000000
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB1_5: // %cleanup4
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; CHECK-NEXT: fmov s0, s1
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; CHECK-NEXT: ret
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entry:
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%cmp14 = icmp eq i64 %start, 0
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br i1 %cmp14, label %cleanup4, label %for.body
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for.cond: ; preds = %for.body
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%cmp = icmp eq i64 %inc, 0
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br i1 %cmp, label %cleanup4, label %for.body
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for.body: ; preds = %entry, %for.cond
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%i.015 = phi i64 [ %inc, %for.cond ], [ %start, %entry ]
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%add = add nsw i64 %i.015, 7
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%arrayidx = getelementptr inbounds float, float* %arr, i64 %add
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%0 = load float, float* %arrayidx, align 4
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%conv = sitofp i64 %i.015 to float
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%add1 = fadd float %conv, %threshold
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%cmp2 = fcmp ogt float %0, %add1
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%inc = add nsw i64 %i.015, 1
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br i1 %cmp2, label %cleanup4, label %for.cond
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cleanup4: ; preds = %for.cond, %for.body, %entry
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%1 = phi float [ -7.000000e+00, %entry ], [ %0, %for.body ], [ -7.000000e+00, %for.cond ]
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ret float %1
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}
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