You've already forked linux-packaging-mono
215 lines
6.0 KiB
LLVM
215 lines
6.0 KiB
LLVM
; RUN: llc -mtriple=i386-linux-gnu %s -o - | FileCheck %s -check-prefix=i386
|
|
; RUN: llc -mtriple=i386-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s -check-prefix=i386f
|
|
|
|
; RUN: llc -mtriple=x86_64-linux-gnu %s -o - | FileCheck %s -check-prefix=x8664
|
|
; RUN: llc -mtriple=x86_64-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s -check-prefix=x8664
|
|
; RUN: llc -mtriple=x86_64-linux-gnu -mattr=+sahf %s -o - | FileCheck %s -check-prefix=x8664-sahf
|
|
; RUN: llc -mtriple=x86_64-linux-gnu -mattr=+sahf -pre-RA-sched=fast %s -o - | FileCheck %s -check-prefix=x8664-sahf
|
|
; RUN: llc -mtriple=x86_64-linux-gnu -mcpu=corei7 %s -o - | FileCheck %s -check-prefix=x8664-sahf
|
|
|
|
; TODO: Reenable verify-machineinstr once the if (!AXDead) // FIXME
|
|
; in X86InstrInfo::copyPhysReg() is resolved.
|
|
|
|
declare i32 @foo()
|
|
declare i32 @bar(i64)
|
|
|
|
define i64 @test_intervening_call(i64* %foo, i64 %bar, i64 %baz) {
|
|
; i386-LABEL: test_intervening_call:
|
|
; i386: cmpxchg8b
|
|
; i386-NEXT: pushl %eax
|
|
; i386-NEXT: seto %al
|
|
; i386-NEXT: lahf
|
|
; i386-NEXT: movl %eax, [[FLAGS:%.*]]
|
|
; i386-NEXT: popl %eax
|
|
; i386-NEXT: subl $8, %esp
|
|
; i386-NEXT: pushl %edx
|
|
; i386-NEXT: pushl %eax
|
|
; i386-NEXT: calll bar
|
|
; i386-NEXT: addl $16, %esp
|
|
; i386-NEXT: movl [[FLAGS]], %eax
|
|
; i386-NEXT: addb $127, %al
|
|
; i386-NEXT: sahf
|
|
; i386-NEXT: jne
|
|
|
|
; In the following case we get a long chain of EFLAGS save/restore due to
|
|
; a sequence of:
|
|
; cmpxchg8b (implicit-def eflags)
|
|
; eax = copy eflags
|
|
; adjcallstackdown32
|
|
; ...
|
|
; use of eax
|
|
; During PEI the adjcallstackdown32 is replaced with the subl which
|
|
; clobbers eflags, effectively interfering in the liveness interval.
|
|
; Is this a case we care about? Maybe no, considering this issue
|
|
; happens with the fast pre-regalloc scheduler enforced. A more
|
|
; performant scheduler would move the adjcallstackdown32 out of the
|
|
; eflags liveness interval.
|
|
|
|
; i386f-LABEL: test_intervening_call:
|
|
; i386f: cmpxchg8b
|
|
; i386f-NEXT: pushl %eax
|
|
; i386f-NEXT: seto %al
|
|
; i386f-NEXT: lahf
|
|
; i386f-NEXT: movl %eax, [[FLAGS:%.*]]
|
|
; i386f-NEXT: popl %eax
|
|
; i386f-NEXT: subl $8, %esp
|
|
; i386f-NEXT: pushl %eax
|
|
; i386f-NEXT: movl %ecx, %eax
|
|
; i386f-NEXT: addb $127, %al
|
|
; i386f-NEXT: sahf
|
|
; i386f-NEXT: popl %eax
|
|
; i386f-NEXT: pushl %eax
|
|
; i386f-NEXT: seto %al
|
|
; i386f-NEXT: lahf
|
|
; i386f-NEXT: movl %eax, %esi
|
|
; i386f-NEXT: popl %eax
|
|
; i386f-NEXT: pushl %edx
|
|
; i386f-NEXT: pushl %eax
|
|
; i386f-NEXT: calll bar
|
|
; i386f-NEXT: addl $16, %esp
|
|
; i386f-NEXT: movl %esi, %eax
|
|
; i386f-NEXT: addb $127, %al
|
|
|
|
; x8664-LABEL: test_intervening_call:
|
|
; x8664: cmpxchgq
|
|
; x8664: pushfq
|
|
; x8664-NEXT: popq [[FLAGS:%.*]]
|
|
; x8664-NEXT: movq %rax, %rdi
|
|
; x8664-NEXT: callq bar
|
|
; x8664-NEXT: pushq [[FLAGS]]
|
|
; x8664-NEXT: popfq
|
|
; x8664-NEXT: jne
|
|
|
|
; x8664-sahf-LABEL: test_intervening_call:
|
|
; x8664-sahf: cmpxchgq
|
|
; x8664-sahf: pushq %rax
|
|
; x8664-sahf-NEXT: seto %al
|
|
; x8664-sahf-NEXT: lahf
|
|
; x8664-sahf-NEXT: movq %rax, [[FLAGS:%.*]]
|
|
; x8664-sahf-NEXT: popq %rax
|
|
; x8664-sahf-NEXT: movq %rax, %rdi
|
|
; x8664-sahf-NEXT: callq bar
|
|
; RAX is dead, no need to push and pop it.
|
|
; x8664-sahf-NEXT: movq [[FLAGS]], %rax
|
|
; x8664-sahf-NEXT: addb $127, %al
|
|
; x8664-sahf-NEXT: sahf
|
|
; x8664-sahf-NEXT: jne
|
|
|
|
%cx = cmpxchg i64* %foo, i64 %bar, i64 %baz seq_cst seq_cst
|
|
%v = extractvalue { i64, i1 } %cx, 0
|
|
%p = extractvalue { i64, i1 } %cx, 1
|
|
call i32 @bar(i64 %v)
|
|
br i1 %p, label %t, label %f
|
|
|
|
t:
|
|
ret i64 42
|
|
|
|
f:
|
|
ret i64 0
|
|
}
|
|
|
|
; Interesting in producing a clobber without any function calls.
|
|
define i32 @test_control_flow(i32* %p, i32 %i, i32 %j) {
|
|
; i386-LABEL: test_control_flow:
|
|
; i386: cmpxchg
|
|
; i386-NEXT: jne
|
|
|
|
; i386f-LABEL: test_control_flow:
|
|
; i386f: cmpxchg
|
|
; i386f-NEXT: jne
|
|
|
|
; x8664-LABEL: test_control_flow:
|
|
; x8664: cmpxchg
|
|
; x8664-NEXT: jne
|
|
|
|
; x8664-sahf-LABEL: test_control_flow:
|
|
; x8664-sahf: cmpxchg
|
|
; x8664-sahf-NEXT: jne
|
|
|
|
entry:
|
|
%cmp = icmp sgt i32 %i, %j
|
|
br i1 %cmp, label %loop_start, label %cond.end
|
|
|
|
loop_start:
|
|
br label %while.condthread-pre-split.i
|
|
|
|
while.condthread-pre-split.i:
|
|
%.pr.i = load i32, i32* %p, align 4
|
|
br label %while.cond.i
|
|
|
|
while.cond.i:
|
|
%0 = phi i32 [ %.pr.i, %while.condthread-pre-split.i ], [ 0, %while.cond.i ]
|
|
%tobool.i = icmp eq i32 %0, 0
|
|
br i1 %tobool.i, label %while.cond.i, label %while.body.i
|
|
|
|
while.body.i:
|
|
%.lcssa = phi i32 [ %0, %while.cond.i ]
|
|
%1 = cmpxchg i32* %p, i32 %.lcssa, i32 %.lcssa seq_cst seq_cst
|
|
%2 = extractvalue { i32, i1 } %1, 1
|
|
br i1 %2, label %cond.end.loopexit, label %while.condthread-pre-split.i
|
|
|
|
cond.end.loopexit:
|
|
br label %cond.end
|
|
|
|
cond.end:
|
|
%cond = phi i32 [ %i, %entry ], [ 0, %cond.end.loopexit ]
|
|
ret i32 %cond
|
|
}
|
|
|
|
; This one is an interesting case because CMOV doesn't have a chain
|
|
; operand. Naive attempts to limit cmpxchg EFLAGS use are likely to fail here.
|
|
define i32 @test_feed_cmov(i32* %addr, i32 %desired, i32 %new) {
|
|
; i386-LABEL: test_feed_cmov:
|
|
; i386: cmpxchgl
|
|
; i386-NEXT: seto %al
|
|
; i386-NEXT: lahf
|
|
; i386-NEXT: movl %eax, [[FLAGS:%.*]]
|
|
; i386-NEXT: calll foo
|
|
; i386-NEXT: pushl %eax
|
|
; i386-NEXT: movl [[FLAGS]], %eax
|
|
; i386-NEXT: addb $127, %al
|
|
; i386-NEXT: sahf
|
|
; i386-NEXT: popl %eax
|
|
|
|
; i386f-LABEL: test_feed_cmov:
|
|
; i386f: cmpxchgl
|
|
; i386f-NEXT: seto %al
|
|
; i386f-NEXT: lahf
|
|
; i386f-NEXT: movl %eax, [[FLAGS:%.*]]
|
|
; i386f-NEXT: calll foo
|
|
; i386f-NEXT: pushl %eax
|
|
; i386f-NEXT: movl [[FLAGS]], %eax
|
|
; i386f-NEXT: addb $127, %al
|
|
; i386f-NEXT: sahf
|
|
; i386f-NEXT: popl %eax
|
|
|
|
; x8664-LABEL: test_feed_cmov:
|
|
; x8664: cmpxchg
|
|
; x8664: pushfq
|
|
; x8664-NEXT: popq [[FLAGS:%.*]]
|
|
; x8664-NEXT: callq foo
|
|
; x8664-NEXT: pushq [[FLAGS]]
|
|
; x8664-NEXT: popfq
|
|
|
|
; x8664-sahf-LABEL: test_feed_cmov:
|
|
; x8664-sahf: cmpxchgl
|
|
; RAX is dead, do not push or pop it.
|
|
; x8664-sahf-NEXT: seto %al
|
|
; x8664-sahf-NEXT: lahf
|
|
; x8664-sahf-NEXT: movq %rax, [[FLAGS:%.*]]
|
|
; x8664-sahf-NEXT: callq foo
|
|
; x8664-sahf-NEXT: pushq %rax
|
|
; x8664-sahf-NEXT: movq [[FLAGS]], %rax
|
|
; x8664-sahf-NEXT: addb $127, %al
|
|
; x8664-sahf-NEXT: sahf
|
|
; x8664-sahf-NEXT: popq %rax
|
|
|
|
%res = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst
|
|
%success = extractvalue { i32, i1 } %res, 1
|
|
|
|
%rhs = call i32 @foo()
|
|
|
|
%ret = select i1 %success, i32 %new, i32 %rhs
|
|
ret i32 %ret
|
|
}
|