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llvm-project/llvm/test/CodeGen/Hexagon/branch-folder-hoist-kills.mir

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Remove stale live-ins in the branch folder Hoisting common code can cause registers that live-in in the successor blocks to no longer be live-in. The live-in information needs to be updated to reflect this, or otherwise incorrect code can be generated later on. Differential Revision: https://reviews.llvm.org/D32661 llvm-svn: 302228
2017-05-05 20:20:07 +08:00
# RUN: llc -march=hexagon -run-pass branch-folder -run-pass if-converter -verify-machineinstrs %s -o - | FileCheck %s
# The hoisting of common instructions from successors could cause registers
# to no longer be live-in in the successor blocks. The liveness was updated
# to include potential new live-in registres, but not to remove registers
# that were no longer live-in.
# This could cause if-converter to generate incorrect code.
#
# In this testcase, the "r1 = A2_sxth r0<kill>" was hoisted, and since r0
# was killed, it was no longer live-in in either successor. The if-converter
# then created code, where the first predicated instruction has incorrect
# implicit use of r0:
#
[CodeGen] Unify MBB reference format in both MIR and debug output As part of the unification of the debug format and the MIR format, print MBB references as '%bb.5'. The MIR printer prints the IR name of a MBB only for block definitions. * find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)->getNumber\(\)/" << printMBBReference(*\1)/g' * find . \( -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#" << ([a-zA-Z0-9_]+)\.getNumber\(\)/" << printMBBReference(\1)/g' * find . \( -name "*.txt" -o -name "*.s" -o -name "*.mir" -o -name "*.cpp" -o -name "*.h" -o -name "*.ll" \) -type f -print0 | xargs -0 sed -i '' -E 's/BB#([0-9]+)/%bb.\1/g' * grep -nr 'BB#' and fix Differential Revision: https://reviews.llvm.org/D40422 llvm-svn: 319665
2017-12-05 01:18:51 +08:00
# %bb.0:
Remove stale live-ins in the branch folder Hoisting common code can cause registers that live-in in the successor blocks to no longer be live-in. The live-in information needs to be updated to reflect this, or otherwise incorrect code can be generated later on. Differential Revision: https://reviews.llvm.org/D32661 llvm-svn: 302228
2017-05-05 20:20:07 +08:00
# Live Ins: %R0
# %R1<def> = A2_sxth %R0<kill> ; hoisted, kills r0
# A2_nop %P0<imp-def>
# %R0<def> = C2_cmoveit %P0, 2, %R0<imp-use> ; predicated A2_tfrsi
[IfConversion] More simple, correct dead/kill liveness handling Patch by Jesper Antonsson. Differential Revision: https://reviews.llvm.org/D37611 llvm-svn: 313268
2017-09-14 23:53:11 +08:00
# %R0<def> = C2_cmoveif killed %P0, 1, %R0<imp-use> ; predicated A2_tfrsi
Remove stale live-ins in the branch folder Hoisting common code can cause registers that live-in in the successor blocks to no longer be live-in. The live-in information needs to be updated to reflect this, or otherwise incorrect code can be generated later on. Differential Revision: https://reviews.llvm.org/D32661 llvm-svn: 302228
2017-05-05 20:20:07 +08:00
# %R0<def> = A2_add %R0<kill>, %R1<kill>
# J2_jumpr %R31, %PC<imp-def,dead>
#
# CHECK: %r1 = A2_sxth killed %r0
# CHECK: %r0 = C2_cmoveit %p0, 2
# CHECK-NOT: implicit-def %r0
[IfConversion] More simple, correct dead/kill liveness handling Patch by Jesper Antonsson. Differential Revision: https://reviews.llvm.org/D37611 llvm-svn: 313268
2017-09-14 23:53:11 +08:00
# CHECK: %r0 = C2_cmoveif killed %p0, 1, implicit killed %r0
Remove stale live-ins in the branch folder Hoisting common code can cause registers that live-in in the successor blocks to no longer be live-in. The live-in information needs to be updated to reflect this, or otherwise incorrect code can be generated later on. Differential Revision: https://reviews.llvm.org/D32661 llvm-svn: 302228
2017-05-05 20:20:07 +08:00
---
name: fred
tracksRegLiveness: true
body: |
bb.0:
liveins: %r0
successors: %bb.1, %bb.2
A2_nop implicit-def %p0
J2_jumpt killed %p0, %bb.2, implicit-def dead %pc
bb.1:
successors: %bb.3
liveins: %r0
%r1 = A2_sxth killed %r0
%r0 = A2_tfrsi 1
J2_jump %bb.3, implicit-def %pc
bb.2:
successors: %bb.3
liveins: %r0
%r1 = A2_sxth killed %r0
%r0 = A2_tfrsi 2
bb.3:
liveins: %r0, %r1
%r0 = A2_add killed %r0, killed %r1
J2_jumpr %r31, implicit-def dead %pc
...