derek.holloway
7502bf64a4
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116 lines
2.8 KiB
ArmAsm
116 lines
2.8 KiB
ArmAsm
// This test checks that the foo function having exclusive memory access
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// instructions won't be instrumented.
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// REQUIRES: system-linux,bolt-runtime,target=aarch64{{.*}}
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// RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown \
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// RUN: %s -o %t.o
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// RUN: %clang %cflags -fPIC -pie %t.o -o %t.exe -nostdlib -Wl,-q -Wl,-fini=dummy
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// RUN: llvm-bolt %t.exe -o %t.bolt -instrument -v=2 | FileCheck %s
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function foo
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function foo
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function foo
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function case1
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function case2
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function case2
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// CHECK: BOLT-INSTRUMENTER: function case3 has exclusive store without corresponding load. Ignoring the function.
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function case4
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// CHECK: BOLT-INSTRUMENTER: function case4 has two exclusive loads. Ignoring the function.
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// CHECK: BOLT-INSTRUMENTER: skip BB {{.*}} due to exclusive instruction in function case5
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// CHECK: BOLT-INSTRUMENTER: function case5 has exclusive load in trailing BB. Ignoring the function.
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.global foo
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.type foo, %function
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foo:
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# exclusive load and store in two bbs
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ldaxr w9, [x10]
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cbnz w9, .Lret
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stlxr w12, w11, [x9]
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cbz w12, foo
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.Lret:
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clrex
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ret
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.size foo, .-foo
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.global _start
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.type _start, %function
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_start:
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mov x0, #0
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mov x1, #1
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mov x2, #2
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mov x3, #3
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bl case1
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bl case2
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bl case3
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bl case4
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bl case5
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ret
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.size _start, .-_start
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# Case 1: exclusive load and store in one basic block
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.global case1
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.type case1, %function
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case1:
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str x0, [x2]
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ldxr w0, [x2]
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add w0, w0, #1
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stxr w1, w0, [x2]
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ret
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.size case1, .-case1
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# Case 2: exclusive load and store in different blocks
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.global case2
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.type case2, %function
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case2:
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b case2_load
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case2_load:
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ldxr x0, [x2]
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b case2_store
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case2_store:
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add x0, x0, #1
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stxr w1, x0, [x2]
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ret
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.size case2, .-case2
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# Case 3: store without preceding load
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.global case3
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.type case3, %function
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case3:
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stxr w1, x3, [x2]
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ret
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.size case3, .-case3
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# Case 4: two exclusive load instructions in neighboring blocks
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.global case4
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.type case4, %function
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case4:
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b case4_load
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case4_load:
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ldxr x0, [x2]
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b case4_load_next
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case4_load_next:
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ldxr x1, [x2]
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ret
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.size case4, .-case4
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# Case 5: Exclusive load without successor
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.global case5
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.type case5, %function
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case5:
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ldxr x0, [x2]
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ret
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.size case5, .-case5
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.global dummy
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.type dummy, %function
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dummy:
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ret
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.size dummy, .-dummy
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