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The vmv1r.v v8, v9 in the last block can be removed by late copy propagation. Reviewed By: wangpc Differential Revision: https://reviews.llvm.org/D155527
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# NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2 | ||
# RUN: llc %s -o - -mtriple=riscv64 -mattr=+v -start-after=finalize-isel | FileCheck %s | ||
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||
--- | | ||
define void @foo() { | ||
; CHECK-LABEL: foo: | ||
; CHECK: # %bb.0: # %entry | ||
; CHECK-NEXT: vsetivli zero, 1, e64, m1, ta, ma | ||
; CHECK-NEXT: vmsne.vi v0, v8, 0 | ||
; CHECK-NEXT: vsll.vi v9, v8, 5 | ||
; CHECK-NEXT: vmerge.vim v9, v9, -1, v0 | ||
; CHECK-NEXT: csrwi vxrm, 0 | ||
; CHECK-NEXT: vssra.vi v8, v8, 2 | ||
; CHECK-NEXT: bgeu a0, zero, .LBB0_3 | ||
; CHECK-NEXT: # %bb.1: # %entry | ||
; CHECK-NEXT: li a2, 128 | ||
; CHECK-NEXT: bltu a0, a2, .LBB0_4 | ||
; CHECK-NEXT: .LBB0_2: # %entry | ||
; CHECK-NEXT: vse64.v v8, (a1) | ||
; CHECK-NEXT: ret | ||
; CHECK-NEXT: .LBB0_3: | ||
; CHECK-NEXT: vmv.v.i v8, 0 | ||
; CHECK-NEXT: li a2, 128 | ||
; CHECK-NEXT: bgeu a0, a2, .LBB0_2 | ||
; CHECK-NEXT: .LBB0_4: # %entry | ||
; CHECK-NEXT: vmv1r.v v8, v9 | ||
; CHECK-NEXT: vse64.v v8, (a1) | ||
; CHECK-NEXT: ret | ||
entry: | ||
ret void | ||
} | ||
... | ||
--- | ||
name: foo | ||
tracksRegLiveness: true | ||
liveins: | ||
- { reg: '$x10', virtual-reg: '%1' } | ||
- { reg: '$x11', virtual-reg: '%2' } | ||
- { reg: '$v8', virtual-reg: '%2' } | ||
body: | | ||
bb.0.entry: | ||
successors: %bb.1, %bb.2 | ||
liveins: $x10, $x11, $x12, $v8 | ||
%2:gpr = COPY $x11 | ||
%1:gpr = COPY $x10 | ||
%3:vr = COPY $v8 | ||
%pt5:vr = IMPLICIT_DEF | ||
%17:vr = PseudoVSLL_VI_M1 %pt5, %3, 5, 1, 6 /* e64 */, 0 | ||
%22:vr = PseudoVMSNE_VI_M1 %3, 0, 1, 6 /* e64 */ | ||
$v0 = COPY %22 | ||
%26:vrnov0 = IMPLICIT_DEF | ||
%25:vrnov0 = PseudoVMERGE_VIM_M1 %26, %17, -1, $v0, 1, 6 /* e64 */ | ||
%pt8:vr = IMPLICIT_DEF | ||
%29:vr = PseudoVSSRA_VI_M1 %pt8, %3, 2, 0, 1, 6 /* e64 */, 0 | ||
%pt9:vr = IMPLICIT_DEF | ||
%30:vr = PseudoVMV_V_I_M1 %pt9, 0, 1, 6 /* e64 */, 0 | ||
BGEU %1, $x0, %bb.2 | ||
bb.1.entry: | ||
bb.2.entry: | ||
successors: %bb.3, %bb.4 | ||
%31:vr = PHI %30, %bb.0, %29, %bb.1 | ||
%32:gpr = ADDI $x0, 128 | ||
BGEU %1, %32, %bb.4 | ||
bb.3.entry: | ||
bb.4.entry: | ||
%33:vr = PHI %31, %bb.2, %25, %bb.3 | ||
PseudoVSE64_V_M1 killed %33, %2, 1, 6 /* e64 */ | ||
PseudoRET | ||
... |