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llvm-project/llvm/test/CodeGen/AArch64/ccmp-successor-probs.mir

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[AArch64] Update successor probabilities after ccmp-conversion This patch modifies the conditional compares pass so that it keeps successor probabilities up-to-date after the conversion. Previously, successor probabilities were being normalized to a uniform distribution, even though they may have been heavily biased prior to the conversion (e.g., if one of the edges was the back edge of a loop). This loss of information affected passes later in the pipeline. Differential Revision: https://reviews.llvm.org/D34109 llvm-svn: 306412
2017-06-27 23:00:22 +08:00
# RUN: llc -o - %s -mtriple=aarch64--linux-gnu -mcpu=falkor -run-pass=aarch64-ccmp | FileCheck %s
---
# This test checks that successor probabilties are properly updated after a
# ccmp-conversion.
#
# CHECK-LABEL: name: aarch64-ccmp-successor-probs
# CHECK: bb.0:
# CHECK-NEXT: successors: %bb.2(0x04000000), %bb.3(0x7c000000)
Followup on Proposal to move MIR physical register namespace to '$' sigil. Discussed here: http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html In preparation for adding support for named vregs we are changing the sigil for physical registers in MIR to '$' from '%'. This will prevent name clashes of named physical register with named vregs. llvm-svn: 323922
2018-02-01 06:04:26 +08:00
# CHECK: CCMPXr %5, %4, 0, 10, implicit-def $nzcv, implicit $nzcv
[AArch64] Update successor probabilities after ccmp-conversion This patch modifies the conditional compares pass so that it keeps successor probabilities up-to-date after the conversion. Previously, successor probabilities were being normalized to a uniform distribution, even though they may have been heavily biased prior to the conversion (e.g., if one of the edges was the back edge of a loop). This loss of information affected passes later in the pipeline. Differential Revision: https://reviews.llvm.org/D34109 llvm-svn: 306412
2017-06-27 23:00:22 +08:00
#
name: aarch64-ccmp-successor-probs
registers:
- { id: 0, class: gpr64 }
- { id: 1, class: gpr64 }
- { id: 2, class: gpr64 }
- { id: 3, class: gpr64 }
- { id: 4, class: gpr64 }
- { id: 5, class: gpr64 }
- { id: 6, class: gpr64 }
- { id: 7, class: gpr64 }
body : |
bb.0:
successors: %bb.1(0x7e000000), %bb.2(0x02000000)
Followup on Proposal to move MIR physical register namespace to '$' sigil. Discussed here: http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html In preparation for adding support for named vregs we are changing the sigil for physical registers in MIR to '$' from '%'. This will prevent name clashes of named physical register with named vregs. llvm-svn: 323922
2018-02-01 06:04:26 +08:00
%0 = LDRXui killed $x0, 69
%1 = COPY $xzr
%2 = SUBSXrr %1, %0, implicit-def dead $nzcv
%3 = SUBSXri $x1, 1, 0, implicit-def dead $nzcv
[AArch64] Update successor probabilities after ccmp-conversion This patch modifies the conditional compares pass so that it keeps successor probabilities up-to-date after the conversion. Previously, successor probabilities were being normalized to a uniform distribution, even though they may have been heavily biased prior to the conversion (e.g., if one of the edges was the back edge of a loop). This loss of information affected passes later in the pipeline. Differential Revision: https://reviews.llvm.org/D34109 llvm-svn: 306412
2017-06-27 23:00:22 +08:00
%4 = COPY %0
%5 = COPY %3
Followup on Proposal to move MIR physical register namespace to '$' sigil. Discussed here: http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html In preparation for adding support for named vregs we are changing the sigil for physical registers in MIR to '$' from '%'. This will prevent name clashes of named physical register with named vregs. llvm-svn: 323922
2018-02-01 06:04:26 +08:00
%6 = SUBSXrr $x1, killed %2, implicit-def $nzcv
Bcc 11, %bb.2, implicit $nzcv
[AArch64] Update successor probabilities after ccmp-conversion This patch modifies the conditional compares pass so that it keeps successor probabilities up-to-date after the conversion. Previously, successor probabilities were being normalized to a uniform distribution, even though they may have been heavily biased prior to the conversion (e.g., if one of the edges was the back edge of a loop). This loss of information affected passes later in the pipeline. Differential Revision: https://reviews.llvm.org/D34109 llvm-svn: 306412
2017-06-27 23:00:22 +08:00
B %bb.1
bb.1:
successors: %bb.2(0x02082082), %bb.3(0x7df7df7e)
Followup on Proposal to move MIR physical register namespace to '$' sigil. Discussed here: http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html In preparation for adding support for named vregs we are changing the sigil for physical registers in MIR to '$' from '%'. This will prevent name clashes of named physical register with named vregs. llvm-svn: 323922
2018-02-01 06:04:26 +08:00
%7 = SUBSXrr %5, %4, implicit-def $nzcv
Bcc 12, %bb.2, implicit $nzcv
[AArch64] Update successor probabilities after ccmp-conversion This patch modifies the conditional compares pass so that it keeps successor probabilities up-to-date after the conversion. Previously, successor probabilities were being normalized to a uniform distribution, even though they may have been heavily biased prior to the conversion (e.g., if one of the edges was the back edge of a loop). This loss of information affected passes later in the pipeline. Differential Revision: https://reviews.llvm.org/D34109 llvm-svn: 306412
2017-06-27 23:00:22 +08:00
B %bb.3
bb.2:
successors: %bb.3(0x80000000)
bb.3:
...