[all-commits] [llvm/llvm-project] 47c902: [X86] Have indirect calls take 64-bit operands in ...

[Harald van Dijk via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 47c902ba8479fc1faed73b86f59d58830df06644
      https://github.com/llvm/llvm-project/commit/47c902ba8479fc1faed73b86f59d58830df06644
  Author: Harald van Dijk <harald at gigawatt.nl>
  Date:   2020-11-28 (Sat, 28 Nov 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86FastISel.cpp

  Log Message:
  -----------
  [X86] Have indirect calls take 64-bit operands in 64-bit modes

The build bots caught two additional pre-existing problems exposed by the test change part of my change https://reviews.llvm.org/D91339, when expensive checks are enabled. This fixes one of them.

X86 has CALL64r and CALL32r opcodes, where CALL64r takes a 64-bit register, and CALL32r takes a 32-bit register. CALL64r can only be used in 64-bit mode, CALL32r can only be used in 32-bit mode. LLVM would assume that after picking the appropriate CALLr opcode, a pointer-sized register would be a valid operand, but in x32 mode, a 64-bit mode, pointers are 32 bits. In this mode, it is invalid to directly pass a pointer to CALL64r, it needs to be extended to 64 bits first.

Reviewed By: RKSimon

Differential Revision: https://reviews.llvm.org/D91924