[PATCH v2 6/7] x86-64: allow HLE store of accumulator to absolute 32-bit address

Jan Beulich jbeulich@suse.com
Fri Aug 26 10:33:19 GMT 2022


In commit 1212781b35c9 ("ix86: allow HLE store of accumulator to
absolute address") I was wrong to exclude 64-bit code. Dropping the
check also leads to better diagnostics in 64-bit code ("MOV", after
all, isn't invalid with "XRELEASE").

While there also limit the amount of further checks done: The operand
type checks that were there were effectively redundant with other ones
anyway, plus it's quite fine to also have "mov <disp>, %eax" look for
the next MOV template (in fact again also improving diagnostics).
---
v2: New.

--- a/gas/config/tc-i386.c
+++ b/gas/config/tc-i386.c
@@ -6817,12 +6817,9 @@ match_template (char mnem_suffix)
 	    continue;
 	  /* xrelease mov %eax, <disp> is another special case. It must not
 	     match the accumulator-only encoding of mov.  */
-	  if (flag_code != CODE_64BIT
-	      && i.hle_prefix
+	  if (i.hle_prefix
 	      && t->base_opcode == 0xa0
-	      && t->opcode_modifier.opcodespace == SPACE_BASE
-	      && i.types[0].bitfield.instance == Accum
-	      && (i.flags[1] & Operand_Mem))
+	      && t->opcode_modifier.opcodespace == SPACE_BASE)
 	    continue;
 	  /* Fall through.  */
 
--- a/gas/testsuite/gas/i386/x86-64-hle-intel.d
+++ b/gas/testsuite/gas/i386/x86-64-hle-intel.d
@@ -425,6 +425,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 20 01          	lock xacquire and BYTE PTR \[rcx\],al
 [ 	]*[a-f0-9]+:	f0 f3 20 01          	lock xrelease and BYTE PTR \[rcx\],al
 [ 	]*[a-f0-9]+:	f3 88 01             	xrelease mov BYTE PTR \[rcx\],al
+[ 	]*[a-f0-9]+:	f3 88 04 25 78 56 34 12 	xrelease mov BYTE PTR (ds:)?0x12345678,al
+[ 	]*[a-f0-9]+:	67 f3 88 04 25 21 43 65 87 	xrelease mov BYTE PTR \[eiz\*1\+0x87654321\],al
 [ 	]*[a-f0-9]+:	f2 f0 08 01          	xacquire lock or BYTE PTR \[rcx\],al
 [ 	]*[a-f0-9]+:	f2 f0 08 01          	xacquire lock or BYTE PTR \[rcx\],al
 [ 	]*[a-f0-9]+:	f3 f0 08 01          	xrelease lock or BYTE PTR \[rcx\],al
@@ -476,6 +478,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 66 21 01       	lock xacquire and WORD PTR \[rcx\],ax
 [ 	]*[a-f0-9]+:	f0 f3 66 21 01       	lock xrelease and WORD PTR \[rcx\],ax
 [ 	]*[a-f0-9]+:	66 f3 89 01          	xrelease mov WORD PTR \[rcx\],ax
+[ 	]*[a-f0-9]+:	66 f3 89 04 25 78 56 34 12 	xrelease mov WORD PTR (ds:)?0x12345678,ax
+[ 	]*[a-f0-9]+:	67 66 f3 89 04 25 21 43 65 87 	xrelease mov WORD PTR \[eiz\*1\+0x87654321\],ax
 [ 	]*[a-f0-9]+:	66 f2 f0 09 01       	xacquire lock or WORD PTR \[rcx\],ax
 [ 	]*[a-f0-9]+:	66 f2 f0 09 01       	xacquire lock or WORD PTR \[rcx\],ax
 [ 	]*[a-f0-9]+:	66 f3 f0 09 01       	xrelease lock or WORD PTR \[rcx\],ax
@@ -527,6 +531,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 21 01          	lock xacquire and DWORD PTR \[rcx\],eax
 [ 	]*[a-f0-9]+:	f0 f3 21 01          	lock xrelease and DWORD PTR \[rcx\],eax
 [ 	]*[a-f0-9]+:	f3 89 01             	xrelease mov DWORD PTR \[rcx\],eax
+[ 	]*[a-f0-9]+:	f3 89 04 25 78 56 34 12 	xrelease mov DWORD PTR (ds:)?0x12345678,eax
+[ 	]*[a-f0-9]+:	67 f3 89 04 25 21 43 65 87 	xrelease mov DWORD PTR \[eiz\*1\+0x87654321\],eax
 [ 	]*[a-f0-9]+:	f2 f0 09 01          	xacquire lock or DWORD PTR \[rcx\],eax
 [ 	]*[a-f0-9]+:	f2 f0 09 01          	xacquire lock or DWORD PTR \[rcx\],eax
 [ 	]*[a-f0-9]+:	f3 f0 09 01          	xrelease lock or DWORD PTR \[rcx\],eax
@@ -578,6 +584,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 48 21 01       	lock xacquire and QWORD PTR \[rcx\],rax
 [ 	]*[a-f0-9]+:	f0 f3 48 21 01       	lock xrelease and QWORD PTR \[rcx\],rax
 [ 	]*[a-f0-9]+:	f3 48 89 01          	xrelease mov QWORD PTR \[rcx\],rax
+[ 	]*[a-f0-9]+:	f3 48 89 04 25 78 56 34 12 	xrelease mov QWORD PTR (ds:)?0x12345678,rax
+[ 	]*[a-f0-9]+:	67 f3 48 89 04 25 21 43 65 87 	xrelease mov QWORD PTR \[eiz\*1\+0x87654321\],rax
 [ 	]*[a-f0-9]+:	f2 f0 48 09 01       	xacquire lock or QWORD PTR \[rcx\],rax
 [ 	]*[a-f0-9]+:	f2 f0 48 09 01       	xacquire lock or QWORD PTR \[rcx\],rax
 [ 	]*[a-f0-9]+:	f3 f0 48 09 01       	xrelease lock or QWORD PTR \[rcx\],rax
--- a/gas/testsuite/gas/i386/x86-64-hle.d
+++ b/gas/testsuite/gas/i386/x86-64-hle.d
@@ -424,6 +424,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 20 01          	lock xacquire and %al,\(%rcx\)
 [ 	]*[a-f0-9]+:	f0 f3 20 01          	lock xrelease and %al,\(%rcx\)
 [ 	]*[a-f0-9]+:	f3 88 01             	xrelease mov %al,\(%rcx\)
+[ 	]*[a-f0-9]+:	f3 88 04 25 78 56 34 12 	xrelease mov %al,0x12345678
+[ 	]*[a-f0-9]+:	67 f3 88 04 25 21 43 65 87 	xrelease mov %al,0x87654321\(,%eiz,1\)
 [ 	]*[a-f0-9]+:	f2 f0 08 01          	xacquire lock or %al,\(%rcx\)
 [ 	]*[a-f0-9]+:	f2 f0 08 01          	xacquire lock or %al,\(%rcx\)
 [ 	]*[a-f0-9]+:	f3 f0 08 01          	xrelease lock or %al,\(%rcx\)
@@ -475,6 +477,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 66 21 01       	lock xacquire and %ax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f0 f3 66 21 01       	lock xrelease and %ax,\(%rcx\)
 [ 	]*[a-f0-9]+:	66 f3 89 01          	xrelease mov %ax,\(%rcx\)
+[ 	]*[a-f0-9]+:	66 f3 89 04 25 78 56 34 12 	xrelease mov %ax,0x12345678
+[ 	]*[a-f0-9]+:	67 66 f3 89 04 25 21 43 65 87 	xrelease mov %ax,0x87654321\(,%eiz,1\)
 [ 	]*[a-f0-9]+:	66 f2 f0 09 01       	xacquire lock or %ax,\(%rcx\)
 [ 	]*[a-f0-9]+:	66 f2 f0 09 01       	xacquire lock or %ax,\(%rcx\)
 [ 	]*[a-f0-9]+:	66 f3 f0 09 01       	xrelease lock or %ax,\(%rcx\)
@@ -526,6 +530,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 21 01          	lock xacquire and %eax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f0 f3 21 01          	lock xrelease and %eax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f3 89 01             	xrelease mov %eax,\(%rcx\)
+[ 	]*[a-f0-9]+:	f3 89 04 25 78 56 34 12 	xrelease mov %eax,0x12345678
+[ 	]*[a-f0-9]+:	67 f3 89 04 25 21 43 65 87 	xrelease mov %eax,0x87654321\(,%eiz,1\)
 [ 	]*[a-f0-9]+:	f2 f0 09 01          	xacquire lock or %eax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f2 f0 09 01          	xacquire lock or %eax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f3 f0 09 01          	xrelease lock or %eax,\(%rcx\)
@@ -577,6 +583,8 @@ Disassembly of section .text:
 [ 	]*[a-f0-9]+:	f0 f2 48 21 01       	lock xacquire and %rax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f0 f3 48 21 01       	lock xrelease and %rax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f3 48 89 01          	xrelease mov %rax,\(%rcx\)
+[ 	]*[a-f0-9]+:	f3 48 89 04 25 78 56 34 12 	xrelease mov %rax,0x12345678
+[ 	]*[a-f0-9]+:	67 f3 48 89 04 25 21 43 65 87 	xrelease mov %rax,0x87654321\(,%eiz,1\)
 [ 	]*[a-f0-9]+:	f2 f0 48 09 01       	xacquire lock or %rax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f2 f0 48 09 01       	xacquire lock or %rax,\(%rcx\)
 [ 	]*[a-f0-9]+:	f3 f0 48 09 01       	xrelease lock or %rax,\(%rcx\)
--- a/gas/testsuite/gas/i386/x86-64-hle.s
+++ b/gas/testsuite/gas/i386/x86-64-hle.s
@@ -442,6 +442,8 @@ _start:
 	.byte 0xf0; .byte 0xf2; andb %al,(%rcx)
 	.byte 0xf0; .byte 0xf3; andb %al,(%rcx)
 	xrelease movb %al,(%rcx)
+	xrelease movb %al,0x12345678
+	xrelease addr32 movb %al,0x87654321
 	xacquire lock orb %al,(%rcx)
 	lock xacquire orb %al,(%rcx)
 	xrelease lock orb %al,(%rcx)
@@ -496,6 +498,8 @@ _start:
 	.byte 0xf0; .byte 0xf2; andw %ax,(%rcx)
 	.byte 0xf0; .byte 0xf3; andw %ax,(%rcx)
 	xrelease movw %ax,(%rcx)
+	xrelease movw %ax,0x12345678
+	xrelease addr32 movw %ax,0x87654321
 	xacquire lock orw %ax,(%rcx)
 	lock xacquire orw %ax,(%rcx)
 	xrelease lock orw %ax,(%rcx)
@@ -550,6 +554,8 @@ _start:
 	.byte 0xf0; .byte 0xf2; andl %eax,(%rcx)
 	.byte 0xf0; .byte 0xf3; andl %eax,(%rcx)
 	xrelease movl %eax,(%rcx)
+	xrelease movl %eax,0x12345678
+	xrelease addr32 movl %eax,0x87654321
 	xacquire lock orl %eax,(%rcx)
 	lock xacquire orl %eax,(%rcx)
 	xrelease lock orl %eax,(%rcx)
@@ -604,6 +610,8 @@ _start:
 	.byte 0xf0; .byte 0xf2; andq %rax,(%rcx)
 	.byte 0xf0; .byte 0xf3; andq %rax,(%rcx)
 	xrelease movq %rax,(%rcx)
+	xrelease movq %rax,0x12345678
+	xrelease addr32 movq %rax,0x87654321
 	xacquire lock orq %rax,(%rcx)
 	lock xacquire orq %rax,(%rcx)
 	xrelease lock orq %rax,(%rcx)



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