llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-23 05:29:23 +00:00

History

Andrea Di Biagio 3b15669938 Fix for PR23103. Correctly propagate the 'IsUndef' flag to the register operands of a commuted instruction.

Revision 220239 exposed a latent bug in method
'TargetInstrInfo::commuteInstruction'. When commuting the operands of a machine
instruction, method 'commuteInstruction' didn't correctly propagate the
'IsUndef' flag to the register operands of the new (commuted) instruction.

Before this patch, the following instruction:
  %vreg4<def> = VADDSDrr  %vreg14, %vreg5<undef>; FR64:%vreg4,%vreg14,%vreg5

was wrongly converted by method 'commuteInstruction' into:
  %vreg4<def> = VADDSDrr  %vreg5, %vreg14<undef>; FR64:%vreg4,%vreg5,%vreg14

The correct instruction should have been:
  %vreg4<def> = VADDSDrr  %vreg5<undef>, %vreg14; FR64:%vreg4,%vreg5,%vreg14

This patch fixes the problem in method 'TargetInstrInfo::commuteInstruction'.
When swapping the operands of a machine instruction, we now make sure that
'IsUndef' flags are correctly set.
Added test case 'pr23103.ll'.

Differential Revision: http://reviews.llvm.org/D9406


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236258 91177308-0d34-0410-b5e6-96231b3b80d8

2015-04-30 21:03:29 +00:00

Analysis

[WinEH] Start EH preparation for 32-bit x86, it uses no arguments

2015-04-29 22:49:54 +00:00

AsmParser

[opaque pointer type] Pass GlobalAlias the actual pointer type rather than decomposing it into pointee type + address space

2015-04-29 21:22:39 +00:00

Bitcode

Don't overflow GCTable

2015-04-30 04:09:41 +00:00

CodeGen

Fix for PR23103. Correctly propagate the 'IsUndef' flag to the register operands of a commuted instruction.