llvm-mirror/micromips-zero-mat-uses.ll at fbe7678f7406ba5a733fc5fa24c7f62f75e0587b - llvm-mirror - Git.je (Gitea)

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Vasileios Kalintiris f084414012 [mips] Check the register class before replacing materializations of zero with $zero in microMIPS.

Summary:
The microMIPS register class GPRMM16 does not contain the $zero register.
However, MipsSEDAGToDAGISel::replaceUsesWithZeroReg() would replace uses
of the $dst register:

  [d]addiu, $dst, $zero, 0

with the $zero register, without checking for membership in the register
class of the target machine operand.

Reviewers: dsanders

Subscribers: llvm-commits, dsanders

Differential Revision: http://reviews.llvm.org/D13984

llvm-svn: 251622

2015-10-29 10:17:16 +00:00

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 ; RUN: llc -march=mips -mcpu=mips32r2 -mattr=+micromips,+nooddspreg -O0 < %s | FileCheck %s
 ; CHECK: addiu    $[[R0:[0-9]+]], $zero, 0
 ; CHECK: subu16   $2, $[[R0]], ${{[0-9]+}}
 define i32 @foo() {
   %1 = sub i32 0, undef
   ret i32 %1
 }