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d882ba8bc5
x86's CMPXCHG -> EFLAGS consumer wasn't being recorded as a real EFLAGS dependency because it was represented by a pair of CopyFromReg(EFLAGS) -> CopyToReg(EFLAGS) nodes. ScheduleDAG was expecting the source to be an implicit-def on the instruction, where the result numbers in the DAG and the Uses list in TableGen matched up precisely. The Copy notation seems much more robust, so this patch extends ScheduleDAG rather than refactoring x86. Should fix PR20376. llvm-svn: 220529
87 lines
2.1 KiB
LLVM
87 lines
2.1 KiB
LLVM
; RUN: llc -mtriple=x86_64-linux-gnu %s -o - | FileCheck %s
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; RUN: llc -mtriple=x86_64-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s
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declare i32 @bar()
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define i64 @test_intervening_call(i64* %foo, i64 %bar, i64 %baz) {
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; CHECK-LABEL: test_intervening_call:
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; CHECK: cmpxchg
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; CHECK: pushfq
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; CHECK: popq [[FLAGS:%.*]]
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; CHECK: callq bar
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; CHECK: pushq [[FLAGS]]
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; CHECK: popfq
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; CHECK: jne
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%cx = cmpxchg i64* %foo, i64 %bar, i64 %baz seq_cst seq_cst
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%p = extractvalue { i64, i1 } %cx, 1
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call i32 @bar()
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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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; CHECK-LABEL: test_control_flow:
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; CHECK: cmpxchg
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; CHECK-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* %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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; CHECK-LABEL: test_feed_cmov:
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; CHECK: cmpxchg
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; CHECK: pushfq
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; CHECK: popq [[FLAGS:%.*]]
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; CHECK: callq bar
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; CHECK: pushq [[FLAGS]]
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; CHECK: popfq
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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 @bar()
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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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