189 lines
5.1 KiB
LLVM
189 lines
5.1 KiB
LLVM
; RUN: llc -mtriple=i386-linux-gnu %s -o - | FileCheck %s -check-prefix=i386
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; RUN: llc -mtriple=i386-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s -check-prefix=i386f
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; RUN: llc -mtriple=x86_64-linux-gnu %s -o - | FileCheck %s -check-prefix=x8664
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; RUN: llc -mtriple=x86_64-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s -check-prefix=x8664
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; RUN: llc -mtriple=x86_64-linux-gnu -mattr=+sahf %s -o - | FileCheck %s -check-prefix=x8664-sahf
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; RUN: llc -mtriple=x86_64-linux-gnu -mattr=+sahf -pre-RA-sched=fast %s -o - | FileCheck %s -check-prefix=x8664-sahf
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; RUN: llc -mtriple=x86_64-linux-gnu -mcpu=corei7 %s -o - | FileCheck %s -check-prefix=x8664-sahf
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; TODO: Reenable verify-machineinstr once the if (!AXDead) // FIXME
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; in X86InstrInfo::copyPhysReg() is resolved.
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declare i32 @foo()
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declare i32 @bar(i64)
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define i64 @test_intervening_call(i64* %foo, i64 %bar, i64 %baz) {
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; i386-LABEL: test_intervening_call:
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; i386: cmpxchg8b
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; i386-NEXT: pushl %eax
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; i386-NEXT: seto %al
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; i386-NEXT: lahf
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; i386-NEXT: movl %eax, [[FLAGS:%.*]]
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; i386-NEXT: popl %eax
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; i386-NEXT: subl $8, %esp
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; i386-NEXT: pushl %edx
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; i386-NEXT: pushl %eax
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; i386-NEXT: calll bar
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; i386-NEXT: addl $16, %esp
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; i386-NEXT: movl [[FLAGS]], %eax
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; i386-NEXT: addb $127, %al
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; i386-NEXT: sahf
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; i386-NEXT: jne
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; i386f-LABEL: test_intervening_call:
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; i386f: cmpxchg8b
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; i386f-NEXT: movl %eax, (%esp)
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; i386f-NEXT: movl %edx, 4(%esp)
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; i386f-NEXT: seto %al
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; i386f-NEXT: lahf
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; i386f-NEXT: movl %eax, [[FLAGS:%.*]]
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; i386f-NEXT: calll bar
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; i386f-NEXT: movl [[FLAGS]], %eax
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; i386f-NEXT: addb $127, %al
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; i386f-NEXT: sahf
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; i386f-NEXT: jne
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; x8664-LABEL: test_intervening_call:
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; x8664: cmpxchgq
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; x8664: pushfq
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; x8664-NEXT: popq [[FLAGS:%.*]]
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; x8664-NEXT: movq %rax, %rdi
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; x8664-NEXT: callq bar
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; x8664-NEXT: pushq [[FLAGS]]
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; x8664-NEXT: popfq
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; x8664-NEXT: jne
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; x8664-sahf-LABEL: test_intervening_call:
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; x8664-sahf: cmpxchgq
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; x8664-sahf: pushq %rax
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; x8664-sahf-NEXT: seto %al
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; x8664-sahf-NEXT: lahf
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; x8664-sahf-NEXT: movq %rax, [[FLAGS:%.*]]
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; x8664-sahf-NEXT: popq %rax
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; x8664-sahf-NEXT: movq %rax, %rdi
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; x8664-sahf-NEXT: callq bar
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; RAX is dead, no need to push and pop it.
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; x8664-sahf-NEXT: movq [[FLAGS]], %rax
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; x8664-sahf-NEXT: addb $127, %al
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; x8664-sahf-NEXT: sahf
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; x8664-sahf-NEXT: jne
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%cx = cmpxchg i64* %foo, i64 %bar, i64 %baz seq_cst seq_cst
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%v = extractvalue { i64, i1 } %cx, 0
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%p = extractvalue { i64, i1 } %cx, 1
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call i32 @bar(i64 %v)
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br i1 %p, label %t, label %f
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t:
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ret i64 42
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f:
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ret i64 0
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}
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; Interesting in producing a clobber without any function calls.
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define i32 @test_control_flow(i32* %p, i32 %i, i32 %j) {
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; i386-LABEL: test_control_flow:
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; i386: cmpxchg
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; i386-NEXT: jne
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; i386f-LABEL: test_control_flow:
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; i386f: cmpxchg
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; i386f-NEXT: jne
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; x8664-LABEL: test_control_flow:
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; x8664: cmpxchg
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; x8664-NEXT: jne
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; x8664-sahf-LABEL: test_control_flow:
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; x8664-sahf: cmpxchg
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; x8664-sahf-NEXT: jne
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entry:
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%cmp = icmp sgt i32 %i, %j
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br i1 %cmp, label %loop_start, label %cond.end
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loop_start:
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br label %while.condthread-pre-split.i
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while.condthread-pre-split.i:
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%.pr.i = load i32, i32* %p, align 4
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br label %while.cond.i
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while.cond.i:
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%0 = phi i32 [ %.pr.i, %while.condthread-pre-split.i ], [ 0, %while.cond.i ]
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%tobool.i = icmp eq i32 %0, 0
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br i1 %tobool.i, label %while.cond.i, label %while.body.i
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while.body.i:
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%.lcssa = phi i32 [ %0, %while.cond.i ]
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%1 = cmpxchg i32* %p, i32 %.lcssa, i32 %.lcssa seq_cst seq_cst
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%2 = extractvalue { i32, i1 } %1, 1
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br i1 %2, label %cond.end.loopexit, label %while.condthread-pre-split.i
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cond.end.loopexit:
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br label %cond.end
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cond.end:
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%cond = phi i32 [ %i, %entry ], [ 0, %cond.end.loopexit ]
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ret i32 %cond
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}
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; This one is an interesting case because CMOV doesn't have a chain
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; operand. Naive attempts to limit cmpxchg EFLAGS use are likely to fail here.
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define i32 @test_feed_cmov(i32* %addr, i32 %desired, i32 %new) {
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; i386-LABEL: test_feed_cmov:
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; i386: cmpxchgl
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; i386-NEXT: seto %al
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; i386-NEXT: lahf
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; i386-NEXT: movl %eax, [[FLAGS:%.*]]
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; i386-NEXT: calll foo
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; i386-NEXT: pushl %eax
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; i386-NEXT: movl [[FLAGS]], %eax
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; i386-NEXT: addb $127, %al
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; i386-NEXT: sahf
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; i386-NEXT: popl %eax
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; i386f-LABEL: test_feed_cmov:
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; i386f: cmpxchgl
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; i386f-NEXT: seto %al
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; i386f-NEXT: lahf
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; i386f-NEXT: movl %eax, [[FLAGS:%.*]]
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; i386f-NEXT: calll foo
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; i386f-NEXT: pushl %eax
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; i386f-NEXT: movl [[FLAGS]], %eax
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; i386f-NEXT: addb $127, %al
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; i386f-NEXT: sahf
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; i386f-NEXT: popl %eax
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; x8664-LABEL: test_feed_cmov:
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; x8664: cmpxchg
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; x8664: pushfq
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; x8664-NEXT: popq [[FLAGS:%.*]]
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; x8664-NEXT: callq foo
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; x8664-NEXT: pushq [[FLAGS]]
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; x8664-NEXT: popfq
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; x8664-sahf-LABEL: test_feed_cmov:
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; x8664-sahf: cmpxchgl
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; RAX is dead, do not push or pop it.
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; x8664-sahf-NEXT: seto %al
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; x8664-sahf-NEXT: lahf
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; x8664-sahf-NEXT: movq %rax, [[FLAGS:%.*]]
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; x8664-sahf-NEXT: callq foo
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; x8664-sahf-NEXT: pushq %rax
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; x8664-sahf-NEXT: movq [[FLAGS]], %rax
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; x8664-sahf-NEXT: addb $127, %al
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; x8664-sahf-NEXT: sahf
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; x8664-sahf-NEXT: popq %rax
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%res = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst
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%success = extractvalue { i32, i1 } %res, 1
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%rhs = call i32 @foo()
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%ret = select i1 %success, i32 %new, i32 %rhs
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ret i32 %ret
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}
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