forked from OSchip/llvm-project
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
// A contrived example to test the double jump removal peephole.
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// RUN: %clang %cflags -O0 %s -o %t.exe
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// RUN: llvm-bolt %t.exe -o %t.bolt -peepholes=double-jumps | \
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// RUN: FileCheck %s -check-prefix=CHECKBOLT
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// RUN: llvm-objdump -d %t.bolt | FileCheck %s
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// CHECKBOLT: BOLT-INFO: Peephole: 1 double jumps patched.
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// CHECK: <_Z3foom>:
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// CHECK-NEXT: sub sp, sp, #16
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// CHECK-NEXT: str x0, [sp, #8]
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// CHECK-NEXT: ldr [[REG:x[0-28]+]], [sp, #8]
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// CHECK-NEXT: cmp [[REG]], #0
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// CHECK-NEXT: b.eq {{.*}} <_Z3foom+0x34>
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// CHECK-NEXT: add [[REG]], [[REG]], #1
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// CHECK-NEXT: add [[REG]], [[REG]], #1
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// CHECK-NEXT: cmp [[REG]], #2
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// CHECK-NEXT: b.eq {{.*}} <_Z3foom+0x28>
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// CHECK-NEXT: add [[REG]], [[REG]], #1
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// CHECK-NEXT: mov [[REG]], x1
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// CHECK-NEXT: ldr x1, [sp]
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// CHECK-NEXT: b {{.*}} <bar>
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// CHECK-NEXT: ldr x1, [sp]
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// CHECK-NEXT: add [[REG]], [[REG]], #1
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// CHECK-NEXT: b {{.*}} <bar>
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extern "C" unsigned long bar(unsigned long count) { return count + 1; }
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unsigned long foo(unsigned long count) {
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asm volatile(" cmp %0,#0\n"
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" b.eq .L7\n"
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" add %0, %0, #1\n"
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" b .L1\n"
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".L1: b .L2\n"
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".L2: add %0, %0, #1\n"
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" cmp %0, #2\n"
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" b.ne .L3\n"
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" b .L4\n"
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".L3: b .L5\n"
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".L5: add %0, %0, #1\n"
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".L4: mov %0,x1\n"
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" ldr x1, [sp]\n"
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" b .L6\n"
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".L7: ldr x1, [sp]\n"
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" add %0, %0, #1\n"
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" b .L6\n"
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".L6: b bar\n"
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:
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: "r"(count)
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:);
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return count;
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}
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int main(int argc, const char *argv[]) { return foo(38); }
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