5390d25f2b
This introduced a false positive MemorySanitizer warning about use of uninitialized memory in a vectorized crc function in Chromium. That suggests maybe something is not right with this transformation. See https://crbug.com/992853#c7 for a reproducer. This also reverts the follow-up commits r368307 and r368308 which depended on this. > This patch attempts to peek through vectors based on the demanded bits/elt of a particular ISD::EXTRACT_VECTOR_ELT node, allowing us to avoid dependencies on ops that have no impact on the extract. > > In particular this helps remove some unnecessary scalar->vector->scalar patterns. > > The wasm shift patterns are annoying - @tlively has indicated that the wasm vector shift codegen are to be refactored in the near-term and isn't considered a major issue. > > Differential Revision: https://reviews.llvm.org/D65887 llvm-svn: 368660
77 lines
2.7 KiB
LLVM
77 lines
2.7 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -verify-machineinstrs -disable-wasm-fallthrough-return-opt -wasm-disable-explicit-locals -mattr=+simd128 | FileCheck %s
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; Regression test for an issue with patterns like the following:
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;
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; t101: v4i32 = BUILD_VECTOR t99, t99, t99, t99
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; t92: i32 = extract_vector_elt t101, Constant:i32<0>
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; t89: i32 = sign_extend_inreg t92, ValueType:ch:i8
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;
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; Notice that the sign_extend_inreg has source value type i8 but the
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; extracted vector has type v4i32. There are no ISel patterns that
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; handle mismatched types like this, so we insert a bitcast before the
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; extract. This was previously an ISel failure. This test case is
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; reduced from a private user bug report, and the vector extracts are
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; optimized out via subsequent DAG combines.
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-unknown"
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define void @foo(<4 x i8>* %p) {
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; CHECK-LABEL: foo:
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; CHECK: .functype foo (i32) -> ()
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; CHECK-NEXT: i32.load8_u 0
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; CHECK-NEXT: i32x4.splat
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; CHECK-NEXT: i32.load8_u 1
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; CHECK-NEXT: i32x4.replace_lane 1
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; CHECK-NEXT: i32.const 2
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: i32.load8_u 0
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; CHECK-NEXT: i32x4.replace_lane 2
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; CHECK-NEXT: i32.const 3
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; CHECK-NEXT: i32.add
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; CHECK-NEXT: i32.load8_u 0
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; CHECK-NEXT: i32x4.replace_lane 3
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; CHECK-NEXT: local.tee
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; CHECK-NEXT: i8x16.extract_lane_s 0
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; CHECK-NEXT: f64.convert_i32_s
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.mul
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.add
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; CHECK-NEXT: f32.demote_f64
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; CHECK-NEXT: f32x4.splat
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; CHECK-NEXT: i8x16.extract_lane_s 4
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; CHECK-NEXT: f64.convert_i32_s
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.mul
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.add
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; CHECK-NEXT: f32.demote_f64
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; CHECK-NEXT: f32x4.replace_lane 1
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; CHECK-NEXT: i8x16.extract_lane_s 8
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; CHECK-NEXT: f64.convert_i32_s
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.mul
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.add
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; CHECK-NEXT: f32.demote_f64
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; CHECK-NEXT: f32x4.replace_lane 2
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; CHECK-NEXT: i8x16.extract_lane_s 12
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; CHECK-NEXT: f64.convert_i32_s
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.mul
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; CHECK-NEXT: f64.const 0x0p0
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; CHECK-NEXT: f64.add
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; CHECK-NEXT: f32.demote_f64
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; CHECK-NEXT: f32x4.replace_lane 3
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; CHECK-NEXT: v128.store 0
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; CHECK-NEXT: return
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%1 = load <4 x i8>, <4 x i8>* %p
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%2 = sitofp <4 x i8> %1 to <4 x double>
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%3 = fmul <4 x double> zeroinitializer, %2
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%4 = fadd <4 x double> %3, zeroinitializer
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%5 = fptrunc <4 x double> %4 to <4 x float>
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store <4 x float> %5, <4 x float>* undef
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ret void
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}
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