clang/test/CodeGen/asm-goto.c

   1 // REQUIRES: x86-registered-target
   2 // RUN: %clang_cc1 -triple x86_64-pc-linux-gnu -O0 -emit-llvm %s -o - | FileCheck %s
   3 // RUN: %clang_cc1 -triple i386-pc-linux-gnu -O0 -emit-llvm %s -o - | FileCheck %s
   4
   5 int test1(int cond) {
   6   // CHECK-LABEL: define{{.*}} i32 @test1(
   7   // CHECK: callbr void asm sideeffect
   8   // CHECK: to label %asm.fallthrough [label %label_true, label %loop]
   9   // CHECK-LABEL: asm.fallthrough:
  10   asm volatile goto("testl %0, %0; jne %l1;" :: "r"(cond)::label_true, loop);
  11   asm volatile goto("testl %0, %0; jne %l2;" :: "r"(cond)::label_true, loop);
  12   // CHECK: callbr void asm sideeffect
  13   // CHECK: to label %asm.fallthrough1 [label %label_true, label %loop]
  14   // CHECK-LABEL: asm.fallthrough1:
  15   return 0;
  16 loop:
  17   return 0;
  18 label_true:
  19   return 1;
  20 }
  21
  22 int test2(int cond) {
  23   // CHECK-LABEL: define{{.*}} i32 @test2(
  24   // CHECK: callbr i32 asm sideeffect
  25   // CHECK: to label %asm.fallthrough [label %label_true.split, label %loop.split]
  26   // CHECK-LABEL: asm.fallthrough:
  27   asm volatile goto("testl %0, %0; jne %l2;" : "=r"(cond) : "r"(cond) :: label_true, loop);
  28   asm volatile goto("testl %0, %0; jne %l3;" : "=r"(cond) : "r"(cond) :: label_true, loop);
  29   // CHECK: callbr i32 asm sideeffect
  30   // CHECK: to label %asm.fallthrough1 [label %label_true.split2, label %loop.split3]
  31   // CHECK-LABEL: asm.fallthrough1:
  32   return 0;
  33 loop:
  34   return 0;
  35 label_true:
  36   return 1;
  37 }
  38
  39 int test3(int out1, int out2) {
  40   // CHECK-LABEL: define{{.*}} i32 @test3(
  41   // CHECK: callbr { i32, i32 } asm sideeffect
  42   // CHECK: to label %asm.fallthrough [label %label_true.split, label %loop.split]
  43   // CHECK-LABEL: asm.fallthrough:
  44   asm volatile goto("testl %0, %0; jne %l3;" : "=r"(out1), "=r"(out2) : "r"(out1) :: label_true, loop);
  45   asm volatile goto("testl %0, %0; jne %l4;" : "=r"(out1), "=r"(out2) : "r"(out1) :: label_true, loop);
  46   // CHECK: callbr { i32, i32 } asm sideeffect
  47   // CHECK: to label %asm.fallthrough6 [label %label_true.split11, label %loop.split14]
  48   // CHECK-LABEL: asm.fallthrough6:
  49   return 0;
  50 loop:
  51   return 0;
  52 label_true:
  53   return 1;
  54 }
  55
  56 int test4(int out1, int out2) {
  57   // CHECK-LABEL: define{{.*}} i32 @test4(
  58   // CHECK: callbr { i32, i32 } asm sideeffect "jne ${5:l}", "={si},={di},r,0,1,!i,!i
  59   // CHECK: to label %asm.fallthrough [label %label_true.split, label %loop.split]
  60   // CHECK-LABEL: asm.fallthrough:
  61   if (out1 < out2)
  62     asm volatile goto("jne %l5" : "+S"(out1), "+D"(out2) : "r"(out1) :: label_true, loop);
  63   else
  64     asm volatile goto("jne %l7" : "+S"(out1), "+D"(out2) : "r"(out1), "r"(out2) :: label_true, loop);
  65   // CHECK: callbr { i32, i32 } asm sideeffect "jne ${7:l}", "={si},={di},r,r,0,1,!i,!i
  66   // CHECK: to label %asm.fallthrough6 [label %label_true.split11, label %loop.split14]
  67   // CHECK-LABEL: asm.fallthrough6:
  68   return out1 + out2;
  69 loop:
  70   return -1;
  71 label_true:
  72   return -2;
  73 }
  74
  75 int test5(int addr, int size, int limit) {
  76   // CHECK-LABEL: define{{.*}} i32 @test5(
  77   // CHECK: callbr i32 asm "add $1,$0 ; jc ${4:l} ; cmp $2,$0 ; ja ${4:l} ; ", "=r,imr,imr,0,!i
  78   // CHECK: to label %asm.fallthrough [label %t_err.split]
  79   // CHECK-LABEL: asm.fallthrough:
  80   asm goto(
  81       "add %1,%0 ; "
  82       "jc %l[t_err] ; "
  83       "cmp %2,%0 ; "
  84       "ja %l[t_err] ; "
  85       : "+r" (addr)
  86       : "g" (size), "g" (limit)
  87       : : t_err);
  88   return 0;
  89 t_err:
  90   return 1;
  91 }
  92
  93 int test6(int out1) {
  94   // CHECK-LABEL: define{{.*}} i32 @test6(
  95   // CHECK: callbr i32 asm sideeffect "testl $0, $0; testl $1, $1; jne ${3:l}", "={si},r,0,!i,!i,{{.*}}
  96   // CHECK: to label %asm.fallthrough [label %label_true.split, label %landing.split]
  97   // CHECK-LABEL: asm.fallthrough:
  98   // CHECK-LABEL: landing:
  99   int out2 = 42;
 100   asm volatile goto("testl %0, %0; testl %1, %1; jne %l3" : "+S"(out2) : "r"(out1) :: label_true, landing);
 101 landing:
 102   return out1 + out2;
 103 label_true:
 104   return -2;
 105 }
 106
 107 // test7 - For the output templates in the asm string (%0, %l2), GCC places
 108 // hidden inputs tied to outputs ("+r" constraint) BEFORE labels. Test that foo
 109 // is $2 (or rather ${2:l} because of the l output template) in the emitted asm
 110 // string, not $1.
 111 void *test7(void) {
 112   // CHECK-LABEL: define{{.*}} ptr @test7(
 113   // CHECK: %1 = callbr ptr asm "# $0\0A\09# ${2:l}", "=r,0,!i,~{dirflag},~{fpsr},~{flags}"(ptr %0)
 114   // CHECK-NEXT: to label %asm.fallthrough [label %foo.split]
 115   void *p = &&foo;
 116   asm goto ("# %0\n\t# %l2":"+r"(p):::foo);
 117 foo:
 118   return p;
 119 }
 120
 121 // test8 - the same as test7, but this time we use symbolic names rather than
 122 // numbered outputs.
 123 void *test8(void) {
 124   // CHECK-LABEL: define{{.*}} ptr @test8(
 125   // CHECK: %1 = callbr ptr asm "# $0\0A\09# ${2:l}", "=r,0,!i,~{dirflag},~{fpsr},~{flags}"(ptr %0)
 126   // CHECK-NEXT: to label %asm.fallthrough [label %foo.split]
 127   void *p = &&foo;
 128   asm goto ("# %0\n\t# %l[foo]":"+r"(p):::foo);
 129 foo:
 130   return p;
 131 }