[X86][PREFETCH]: Adding full coverage of MC encoding for the PREFETCH isa sets.<NFC>

[gadi.haber]

Summary

NFC.
Adding MC regressions tests to cover the PREFETCH isa sets for both 32 and 64 bit.
This patch is part of a larger task to cover MC encoding of all X86 ISA Sets started in revision: https://reviews.llvm.org/D39952

[RKSimon]

What about PREFETCHNTA/PREFETCH0/PREFETCH1/PREFETCH2 ?

PREFETCHNTA mem8 0F 18 /0 Move data closer to the processor using the NTA reference.
PREFETCHT0 mem8 0F 18 /1 Move data closer to the processor using the T0 reference.
PREFETCHT1 mem8 0F 18 /2 Move data closer to the processor using the T1 reference.
PREFETCHT2 mem8 0F 18 /3 Move data closer to the processor using the T2 reference.

[gadi.haber]

Added missing tests for the prefetcht0/1/2 and prefetchnta instructions

[craig.topper]

I was going to tell you that prefetchwt1 is missing, but then I realized its only half implemented in llvm. We have a feature flag and no instruction definition.

[craig.topper]

prefetchwt1 is supported now. Can you add it to this test?

[gadi.haber]

Sorry for delayed response. Just returned from vacation.
Added the prefetchwt1 testing.

[craig.topper]

LGTM

llvm/trunk/test/MC/X86/PREFETCH-32.s

+// RUN: llvm-mc -triple i386-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: prefetch -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x84,0x82,0x10,0xe3,0x0f,0xe3]        
+prefetch -485498096(%edx,%eax,4) 
+
+// CHECK: prefetch 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x84,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetch 485498096(%edx,%eax,4) 
+
+// CHECK: prefetch 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x0d,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetch 485498096(%edx) 
+
+// CHECK: prefetch 485498096 
+// CHECK: encoding: [0x0f,0x0d,0x05,0xf0,0x1c,0xf0,0x1c]        
+prefetch 485498096 
+
+// CHECK: prefetch 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x0d,0x44,0x02,0x40]        
+prefetch 64(%edx,%eax) 
+
+// CHECK: prefetch (%edx) 
+// CHECK: encoding: [0x0f,0x0d,0x02]        
+prefetch (%edx) 
+
+// CHECK: prefetchnta -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x84,0x82,0x10,0xe3,0x0f,0xe3]        
+prefetchnta -485498096(%edx,%eax,4) 
+
+// CHECK: prefetchnta 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x84,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetchnta 485498096(%edx,%eax,4) 
+
+// CHECK: prefetchnta 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x18,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetchnta 485498096(%edx) 
+
+// CHECK: prefetchnta 485498096 
+// CHECK: encoding: [0x0f,0x18,0x05,0xf0,0x1c,0xf0,0x1c]        
+prefetchnta 485498096 
+
+// CHECK: prefetchnta 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x18,0x44,0x02,0x40]        
+prefetchnta 64(%edx,%eax) 
+
+// CHECK: prefetchnta (%edx) 
+// CHECK: encoding: [0x0f,0x18,0x02]        
+prefetchnta (%edx) 
+
+// CHECK: prefetcht0 -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x8c,0x82,0x10,0xe3,0x0f,0xe3]        
+prefetcht0 -485498096(%edx,%eax,4) 
+
+// CHECK: prefetcht0 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x8c,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetcht0 485498096(%edx,%eax,4) 
+
+// CHECK: prefetcht0 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x18,0x8a,0xf0,0x1c,0xf0,0x1c]        
+prefetcht0 485498096(%edx) 
+
+// CHECK: prefetcht0 485498096 
+// CHECK: encoding: [0x0f,0x18,0x0d,0xf0,0x1c,0xf0,0x1c]        
+prefetcht0 485498096 
+
+// CHECK: prefetcht0 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x18,0x4c,0x02,0x40]        
+prefetcht0 64(%edx,%eax) 
+
+// CHECK: prefetcht0 (%edx) 
+// CHECK: encoding: [0x0f,0x18,0x0a]        
+prefetcht0 (%edx) 
+
+// CHECK: prefetcht1 -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x94,0x82,0x10,0xe3,0x0f,0xe3]        
+prefetcht1 -485498096(%edx,%eax,4) 
+
+// CHECK: prefetcht1 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x94,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetcht1 485498096(%edx,%eax,4) 
+
+// CHECK: prefetcht1 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x18,0x92,0xf0,0x1c,0xf0,0x1c]        
+prefetcht1 485498096(%edx) 
+
+// CHECK: prefetcht1 485498096 
+// CHECK: encoding: [0x0f,0x18,0x15,0xf0,0x1c,0xf0,0x1c]        
+prefetcht1 485498096 
+
+// CHECK: prefetcht1 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x18,0x54,0x02,0x40]        
+prefetcht1 64(%edx,%eax) 
+
+// CHECK: prefetcht1 (%edx) 
+// CHECK: encoding: [0x0f,0x18,0x12]        
+prefetcht1 (%edx) 
+
+// CHECK: prefetcht2 -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x9c,0x82,0x10,0xe3,0x0f,0xe3]        
+prefetcht2 -485498096(%edx,%eax,4) 
+
+// CHECK: prefetcht2 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x18,0x9c,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetcht2 485498096(%edx,%eax,4) 
+
+// CHECK: prefetcht2 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x18,0x9a,0xf0,0x1c,0xf0,0x1c]        
+prefetcht2 485498096(%edx) 
+
+// CHECK: prefetcht2 485498096 
+// CHECK: encoding: [0x0f,0x18,0x1d,0xf0,0x1c,0xf0,0x1c]        
+prefetcht2 485498096 
+
+// CHECK: prefetcht2 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x18,0x5c,0x02,0x40]        
+prefetcht2 64(%edx,%eax) 
+
+// CHECK: prefetcht2 (%edx) 
+// CHECK: encoding: [0x0f,0x18,0x1a]        
+prefetcht2 (%edx) 
+
+// CHECK: prefetchw -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x8c,0x82,0x10,0xe3,0x0f,0xe3]        
+prefetchw -485498096(%edx,%eax,4) 
+
+// CHECK: prefetchw 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x8c,0x82,0xf0,0x1c,0xf0,0x1c]        
+prefetchw 485498096(%edx,%eax,4) 
+
+// CHECK: prefetchw 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x0d,0x8a,0xf0,0x1c,0xf0,0x1c]        
+prefetchw 485498096(%edx) 
+
+// CHECK: prefetchw 485498096 
+// CHECK: encoding: [0x0f,0x0d,0x0d,0xf0,0x1c,0xf0,0x1c]        
+prefetchw 485498096 
+
+// CHECK: prefetchw 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x0d,0x4c,0x02,0x40]        
+prefetchw 64(%edx,%eax) 
+
+// CHECK: prefetchw (%edx) 
+// CHECK: encoding: [0x0f,0x0d,0x0a]        
+prefetchw (%edx) 
+
+// CHECK: prefetchwt1 -485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x94,0x82,0x10,0xe3,0x0f,0xe3]
+prefetchwt1 -485498096(%edx,%eax,4) 
+
+// CHECK: prefetchwt1 485498096(%edx,%eax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x94,0x82,0xf0,0x1c,0xf0,0x1c]
+prefetchwt1 485498096(%edx,%eax,4) 
+
+// CHECK: prefetchwt1 485498096(%edx) 
+// CHECK: encoding: [0x0f,0x0d,0x92,0xf0,0x1c,0xf0,0x1c]
+prefetchwt1 485498096(%edx) 
+
+// CHECK: prefetchwt1 485498096 
+// CHECK: encoding: [0x0f,0x0d,0x15,0xf0,0x1c,0xf0,0x1c]
+prefetchwt1 485498096 
+
+// CHECK: prefetchwt1 64(%edx,%eax) 
+// CHECK: encoding: [0x0f,0x0d,0x54,0x02,0x40
+prefetchwt1 64(%edx,%eax) 
+
+// CHECK: prefetchwt1 (%edx) 
+// CHECK: encoding:  [0x0f,0x0d,0x12]
+prefetchwt1 (%edx) 

llvm/trunk/test/MC/X86/PREFETCH-64.s

+// RUN: llvm-mc -triple x86_64-unknown-unknown --show-encoding %s | FileCheck %s
+
+// CHECK: prefetch 485498096 
+// CHECK: encoding: [0x0f,0x0d,0x04,0x25,0xf0,0x1c,0xf0,0x1c]        
+prefetch 485498096 
+
+// CHECK: prefetch 64(%rdx) 
+// CHECK: encoding: [0x0f,0x0d,0x42,0x40]        
+prefetch 64(%rdx) 
+
+// CHECK: prefetch 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x44,0x82,0x40]        
+prefetch 64(%rdx,%rax,4) 
+
+// CHECK: prefetch -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x44,0x82,0xc0]        
+prefetch -64(%rdx,%rax,4) 
+
+// CHECK: prefetch 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x0d,0x44,0x02,0x40]        
+prefetch 64(%rdx,%rax) 
+
+// CHECK: prefetchnta 485498096 
+// CHECK: encoding: [0x0f,0x18,0x04,0x25,0xf0,0x1c,0xf0,0x1c]        
+prefetchnta 485498096 
+
+// CHECK: prefetchnta 64(%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x42,0x40]        
+prefetchnta 64(%rdx) 
+
+// CHECK: prefetchnta 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x44,0x82,0x40]        
+prefetchnta 64(%rdx,%rax,4) 
+
+// CHECK: prefetchnta -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x44,0x82,0xc0]        
+prefetchnta -64(%rdx,%rax,4) 
+
+// CHECK: prefetchnta 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x18,0x44,0x02,0x40]        
+prefetchnta 64(%rdx,%rax) 
+
+// CHECK: prefetchnta (%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x02]        
+prefetchnta (%rdx) 
+
+// CHECK: prefetch (%rdx) 
+// CHECK: encoding: [0x0f,0x0d,0x02]        
+prefetch (%rdx) 
+
+// CHECK: prefetcht0 485498096 
+// CHECK: encoding: [0x0f,0x18,0x0c,0x25,0xf0,0x1c,0xf0,0x1c]        
+prefetcht0 485498096 
+
+// CHECK: prefetcht0 64(%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x4a,0x40]        
+prefetcht0 64(%rdx) 
+
+// CHECK: prefetcht0 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x4c,0x82,0x40]        
+prefetcht0 64(%rdx,%rax,4) 
+
+// CHECK: prefetcht0 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x4c,0x82,0xc0]        
+prefetcht0 -64(%rdx,%rax,4) 
+
+// CHECK: prefetcht0 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x18,0x4c,0x02,0x40]        
+prefetcht0 64(%rdx,%rax) 
+
+// CHECK: prefetcht0 (%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x0a]        
+prefetcht0 (%rdx) 
+
+// CHECK: prefetcht1 485498096 
+// CHECK: encoding: [0x0f,0x18,0x14,0x25,0xf0,0x1c,0xf0,0x1c]        
+prefetcht1 485498096 
+
+// CHECK: prefetcht1 64(%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x52,0x40]        
+prefetcht1 64(%rdx) 
+
+// CHECK: prefetcht1 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x54,0x82,0x40]        
+prefetcht1 64(%rdx,%rax,4) 
+
+// CHECK: prefetcht1 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x54,0x82,0xc0]        
+prefetcht1 -64(%rdx,%rax,4) 
+
+// CHECK: prefetcht1 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x18,0x54,0x02,0x40]        
+prefetcht1 64(%rdx,%rax) 
+
+// CHECK: prefetcht1 (%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x12]        
+prefetcht1 (%rdx) 
+
+// CHECK: prefetcht2 485498096 
+// CHECK: encoding: [0x0f,0x18,0x1c,0x25,0xf0,0x1c,0xf0,0x1c]        
+prefetcht2 485498096 
+
+// CHECK: prefetcht2 64(%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x5a,0x40]        
+prefetcht2 64(%rdx) 
+
+// CHECK: prefetcht2 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x5c,0x82,0x40]        
+prefetcht2 64(%rdx,%rax,4) 
+
+// CHECK: prefetcht2 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x18,0x5c,0x82,0xc0]        
+prefetcht2 -64(%rdx,%rax,4) 
+
+// CHECK: prefetcht2 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x18,0x5c,0x02,0x40]        
+prefetcht2 64(%rdx,%rax) 
+
+// CHECK: prefetcht2 (%rdx) 
+// CHECK: encoding: [0x0f,0x18,0x1a]        
+prefetcht2 (%rdx) 
+
+// CHECK: prefetchw 485498096 
+// CHECK: encoding: [0x0f,0x0d,0x0c,0x25,0xf0,0x1c,0xf0,0x1c]        
+prefetchw 485498096 
+
+// CHECK: prefetchw 64(%rdx) 
+// CHECK: encoding: [0x0f,0x0d,0x4a,0x40]        
+prefetchw 64(%rdx) 
+
+// CHECK: prefetchw 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x4c,0x82,0x40]        
+prefetchw 64(%rdx,%rax,4) 
+
+// CHECK: prefetchw -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x4c,0x82,0xc0]        
+prefetchw -64(%rdx,%rax,4) 
+
+// CHECK: prefetchw 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x0d,0x4c,0x02,0x40]        
+prefetchw 64(%rdx,%rax) 
+
+// CHECK: prefetchw (%rdx) 
+// CHECK: encoding: [0x0f,0x0d,0x0a]        
+prefetchw (%rdx) 
+
+// CHECK: prefetchwt1 485498096 
+// CHECK: encoding:  [0x0f,0x0d,0x14,0x25,0xf0,0x1c,0xf0,0x1c]
+prefetchwt1 485498096 
+
+// CHECK: prefetchwt1 64(%rdx) 
+// CHECK: encoding: [0x0f,0x0d,0x52,0x40]
+prefetchwt1 64(%rdx) 
+
+// CHECK: prefetchwt1 64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x54,0x82,0x40]
+prefetchwt1 64(%rdx,%rax,4) 
+
+// CHECK: prefetchwt1 -64(%rdx,%rax,4) 
+// CHECK: encoding: [0x0f,0x0d,0x54,0x82,0xc0]
+prefetchwt1 -64(%rdx,%rax,4) 
+
+// CHECK: prefetchwt1 64(%rdx,%rax) 
+// CHECK: encoding: [0x0f,0x0d,0x54,0x02,0x40]        
+prefetchwt1 64(%rdx,%rax) 
+
+// CHECK: prefetchwt1 (%rdx) 
+// CHECK: encoding: [0x0f,0x0d,0x12]        
+prefetchwt1 (%rdx) 
+