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clang doesn't support Y-prefixed asm constraints #13571

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llvmbot opened this issue Jun 25, 2012 · 4 comments
Open

clang doesn't support Y-prefixed asm constraints #13571

llvmbot opened this issue Jun 25, 2012 · 4 comments
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bugzilla Issues migrated from bugzilla clang:frontend Language frontend issues, e.g. anything involving "Sema"

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@llvmbot
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llvmbot commented Jun 25, 2012

Bugzilla Link 13199
Version 3.1
OS All
Blocks #11360
Reporter LLVM Bugzilla Contributor
CC @tkremenek,@RKSimon,@noloader

Extended Description

$ cat 1.c
#include <inttypes.h>

static uint64_t y = 0x123456789ABCDEF0ULL;

int
main()
{
register uint64_t x;
asm volatile ( "movq %1, %0" : "=Yz"(x) : "m"(y) );

return 0;

}

$ cc -O0 -ggdb -Wall -W -mssse3 -m64 1.c -o 1

$ objdump -d 1
...
0000000000400530

:
400530: 55 push %rbp
400531: 48 89 e5 mov %rsp,%rbp
400534: f3 0f 7e 05 a4 00 10 movq 1048740(%rip),%xmm0 # 5005e0
40053b: 00
40053c: b8 00 00 00 00 mov $0x0,%eax
400541: c9 leaveq
400542: c3 retq
...

$ clang -O0 -ggdb -Wall -W -mssse3 -m64 1.c -o 1
1.c:9:33: error: invalid output constraint '=Yz' in asm
asm volatile ( "movq %1, %0" : "=Yz"(x) : "m"(y) );
^
1 error generated.

$ cc --version
cc (GCC) 4.2.2 20070831 prerelease [FreeBSD]
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ clang --version
clang version 3.1 (trunk)
Target: amd64-portbld-freebsd8.2
Thread model: posix
@llvmbot
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llvmbot commented Jun 25, 2012

From http://gcc.gnu.org/svn/gcc/trunk/gcc/config/i386/constraints.md :

;; We use the Y prefix to denote any number of conditional register sets:
;; z First SSE register.
;; i SSE2 inter-unit moves enabled
;; m MMX inter-unit moves enabled
;; a Integer register when zero extensions with AND are disabled
;; p Integer register when TARGET_PARTIAL_REG_STALL is disabled
;; d Integer register when integer DFmode moves are enabled
;; x Integer register when integer XFmode moves are enabled

Looks like clang doesn't support any of Y-prefixed constraints.

@tkremenek
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cloned to rdar://problem/11741367

@RKSimon
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RKSimon commented Apr 21, 2017

*** Bug llvm/llvm-bugzilla-archive#32727 has been marked as a duplicate of this bug. ***

@RKSimon
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RKSimon commented Nov 26, 2021

mentioned in issue llvm/llvm-bugzilla-archive#32727

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
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