diff options
| author | Nirav Dave <niravd@google.com> | 2017-11-20 18:38:55 +0000 |
|---|---|---|
| committer | Nirav Dave <niravd@google.com> | 2017-11-20 18:38:55 +0000 |
| commit | 7078f99f3b946d3d32c45f3d8ebd4250169be694 (patch) | |
| tree | 9d206d937432462b64913dad2062b60c5b65aa9a /lib/Target/X86/MCTargetDesc | |
| parent | bfeecfb5a0375eab2f1cee244776114dead0aa97 (diff) | |
[X86] Avoid unecessary opsize byte in segment move to memory
Summary:
Segment moves to memory are always 16-bit. Remove invalid 32 and 64
bit variants.
Fixes PR34478.
Reviewers: rnk, craig.topper
Subscribers: llvm-commits, hiraditya
Differential Revision: https://reviews.llvm.org/D39847
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@318678 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86/MCTargetDesc')
| -rw-r--r-- | lib/Target/X86/MCTargetDesc/X86BaseInfo.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/Target/X86/MCTargetDesc/X86BaseInfo.h b/lib/Target/X86/MCTargetDesc/X86BaseInfo.h index 7c6444ba58a..f65ba1b6005 100644 --- a/lib/Target/X86/MCTargetDesc/X86BaseInfo.h +++ b/lib/Target/X86/MCTargetDesc/X86BaseInfo.h @@ -366,13 +366,15 @@ namespace X86II { // OpSize - OpSizeFixed implies instruction never needs a 0x66 prefix. // OpSize16 means this is a 16-bit instruction and needs 0x66 prefix in // 32-bit mode. OpSize32 means this is a 32-bit instruction needs a 0x66 - // prefix in 16-bit mode. + // prefix in 16-bit mode. OpSizeIgnore means that the instruction may + // take a optional 0x66 byte but should not emit with one. OpSizeShift = 7, OpSizeMask = 0x3 << OpSizeShift, - OpSizeFixed = 0 << OpSizeShift, - OpSize16 = 1 << OpSizeShift, - OpSize32 = 2 << OpSizeShift, + OpSizeFixed = 0 << OpSizeShift, + OpSize16 = 1 << OpSizeShift, + OpSize32 = 2 << OpSizeShift, + OpSizeIgnore = 3 << OpSizeShift, // AsSize - AdSizeX implies this instruction determines its need of 0x67 // prefix from a normal ModRM memory operand. The other types indicate that |