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c3db369888
This code starts from the high end of the sorted vector of offsets, and
works backwards: it tries to find contiguous offsets, process them, then
pops them from the end of the vector. Most of the code agrees with this
order of processing, but one loop doesn't: it instead processes elements
from the low end of the vector (which are nodes with unrelated offsets).
Fix that loop to process the correct elements.
This has a few implications. One, we don't incorrectly return early when
processing multiple groups of offsets in the same block (which allows
rescheduling prera-ldst-insertpt.mir). Two, we pick the correct insert
point for loads, so they're correctly sorted (which affects the
scheduling of vldm-liveness.ll). I think it might also impact some of
the heuristics slightly.
Differential Revision: https://reviews.llvm.org/D30368
llvm-svn: 296701
28 lines
1010 B
LLVM
28 lines
1010 B
LLVM
; RUN: llc -mtriple thumbv7-apple-ios -verify-machineinstrs -o - %s | FileCheck %s
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; Make sure we emit the loads in ascending order, and form a vldmia.
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;
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; See vldm-liveness.mir for the bug this file originally testing.
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define arm_aapcs_vfpcc <4 x float> @foo(float* %ptr) {
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; CHECK-LABEL: foo:
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; CHECK: vldmia r0, {s0, s1}
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; CHECK: vldr s3, [r0, #8]
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; CHECK: vldr s2, [r0, #16]
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%off0 = getelementptr float, float* %ptr, i32 0
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%val0 = load float, float* %off0
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%off1 = getelementptr float, float* %ptr, i32 1
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%val1 = load float, float* %off1
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%off4 = getelementptr float, float* %ptr, i32 4
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%val4 = load float, float* %off4
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%off2 = getelementptr float, float* %ptr, i32 2
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%val2 = load float, float* %off2
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%vec1 = insertelement <4 x float> undef, float %val0, i32 0
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%vec2 = insertelement <4 x float> %vec1, float %val1, i32 1
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%vec3 = insertelement <4 x float> %vec2, float %val4, i32 2
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%vec4 = insertelement <4 x float> %vec3, float %val2, i32 3
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ret <4 x float> %vec4
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}
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