| ; RUN: llc -verify-machineinstrs -mtriple=i386-linux-gnu %s -o - | FileCheck %s |
| ; RUN: llc -verify-machineinstrs -mtriple=i386-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s |
| ; RUN: llc -verify-machineinstrs -mtriple=x86_64-linux-gnu %s -o - | FileCheck %s |
| ; RUN: llc -verify-machineinstrs -mtriple=x86_64-linux-gnu -pre-RA-sched=fast %s -o - | FileCheck %s |
| |
| declare i32 @bar() |
| |
| define i64 @test_intervening_call(i64* %foo, i64 %bar, i64 %baz) { |
| ; CHECK-LABEL: test_intervening_call: |
| ; CHECK: cmpxchg |
| ; CHECK: pushf[[LQ:[lq]]] |
| ; CHECK-NEXT: pop[[LQ]] [[FLAGS:%.*]] |
| |
| ; CHECK-NEXT: call[[LQ]] bar |
| |
| ; CHECK-NEXT: push[[LQ]] [[FLAGS]] |
| ; CHECK-NEXT: popf[[LQ]] |
| ; CHECK-NEXT: jne |
| %cx = cmpxchg i64* %foo, i64 %bar, i64 %baz seq_cst seq_cst |
| %p = extractvalue { i64, i1 } %cx, 1 |
| call i32 @bar() |
| 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) { |
| ; CHECK-LABEL: test_control_flow: |
| |
| ; CHECK: cmpxchg |
| ; CHECK-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) { |
| ; CHECK-LABEL: test_feed_cmov: |
| |
| ; CHECK: cmpxchg |
| ; CHECK: pushf[[LQ:[lq]]] |
| ; CHECK-NEXT: pop[[LQ]] [[FLAGS:%.*]] |
| |
| ; CHECK-NEXT: call[[LQ]] bar |
| |
| ; CHECK-NEXT: push[[LQ]] [[FLAGS]] |
| ; CHECK-NEXT: popf[[LQ]] |
| %res = cmpxchg i32* %addr, i32 %desired, i32 %new seq_cst seq_cst |
| %success = extractvalue { i32, i1 } %res, 1 |
| |
| %rhs = call i32 @bar() |
| |
| %ret = select i1 %success, i32 %new, i32 %rhs |
| ret i32 %ret |
| } |