[llvm] [IPSCCP] Variable not visible at Og. (PR #66745)

[Nikita Popov via llvm-commits]

================
@@ -0,0 +1,184 @@
+; RUN: opt -passes=ipsccp -S -o - < %s | FileCheck %s
+
+; Global variables g_11, g_22, g_33, g_44, g_55, g_66 and g_77
+; are not visible in the debugger.
+
+;  1	int       g_1 = -4;
+;  2	float     g_2 = 4.44;
+;  3	char      g_3 = 'a';
+;  4	unsigned  g_4 = 4;
+;  5	bool      g_5 = true;
+;  6	int      *g_6 = nullptr;
+;  7	float    *g_7 = nullptr;
+;  8
+;  9	static int       g_11 = -5;
+; 10	static float     g_22 = 5.55;
+; 11	static char      g_33 = 'b';
+; 12	static unsigned  g_44 = 5;
+; 13	static bool      g_55 = true;
+; 14	static int      *g_66 = nullptr;
+; 15	static float    *g_77 = (float *)(55 + 15);
+; 16
+; 17	void bar() {
+; 18	  g_1 = g_11;
+; 19	  g_2 = g_22;
+; 20	  g_3 = g_33;
+; 21	  g_4 = g_44;
+; 22	  g_5 = g_55;
+; 23	  g_6 = g_66;
+; 24	  g_7 = g_77;
+; 25	}
+; 26
+; 27	int main() {
+; 28	  {
+; 29	    bar();
+; 30	  }
+; 31	}
+
+; CHECK: ![[G1:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG1:[0-9]+]], expr: !DIExpression(DW_OP_constu, 18446744073709551611, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG1]] = distinct !DIGlobalVariable(name: "g_11", {{.*}}
+; CHECK: ![[G2:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG2:[0-9]+]], expr: !DIExpression(DW_OP_constu, 1085381018, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG2]] = distinct !DIGlobalVariable(name: "g_22", {{.*}}
+; CHECK: ![[G3:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG3:[0-9]+]], expr: !DIExpression(DW_OP_constu, 98, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG3]] = distinct !DIGlobalVariable(name: "g_33", {{.*}}
+; CHECK: ![[G4:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG4:[0-9]+]], expr: !DIExpression(DW_OP_constu, 5, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG4]] = distinct !DIGlobalVariable(name: "g_44", {{.*}}
+; CHECK: ![[G5:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG5:[0-9]+]], expr: !DIExpression(DW_OP_constu, 1, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG5]] = distinct !DIGlobalVariable(name: "g_55", {{.*}}
+; CHECK: ![[G6:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG6:[0-9]+]], expr: !DIExpression(DW_OP_constu, 0, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG6]] = distinct !DIGlobalVariable(name: "g_66", {{.*}}
+; CHECK: ![[G7:[0-9]+]] = !DIGlobalVariableExpression(var: ![[DBG7:[0-9]+]], expr: !DIExpression(DW_OP_constu, 70, DW_OP_stack_value))
+; CHECK-DAG: ![[DBG7]] = distinct !DIGlobalVariable(name: "g_77", {{.*}}
+
+target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-linux-gnu"
----------------
nikic wrote:

Data layout and triple shouldn't be necessary. (If you specify a triple, it's either useless or you need to add REQUIRES, otherwise you will break the build.)

https://github.com/llvm/llvm-project/pull/66745