[clang] 131cddc - [AVR] Fix broken bitcast for aliases in non-zero address space
Ayke van Laethem via cfe-commits
cfe-commits at lists.llvm.org
Sun Nov 27 06:31:31 PST 2022
Author: Ayke van Laethem
Date: 2022-11-27T15:27:42+01:00
New Revision: 131cddcba2c4c953a8a49d7adbf656cab9e9f1c7
URL: https://github.com/llvm/llvm-project/commit/131cddcba2c4c953a8a49d7adbf656cab9e9f1c7
DIFF: https://github.com/llvm/llvm-project/commit/131cddcba2c4c953a8a49d7adbf656cab9e9f1c7.diff
LOG: [AVR] Fix broken bitcast for aliases in non-zero address space
This was triggered by some code in picolibc. The minimal version looks
like this:
double infinity(void) {
return 5;
}
extern long double infinityl() __attribute__((__alias__("infinity")));
These two declarations have a different type (not because of the 'long
double', which is also 'double' in IR, but because infinityl has
variadic parameters). This led to a crash in the bitcast which assumed
address space 0.
Differential Revision: https://reviews.llvm.org/D138681
Added:
Modified:
clang/lib/CodeGen/CodeGenModule.cpp
clang/test/CodeGen/avr/alias-avr.c
Removed:
################################################################################
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index ae25767bc753a..133c603622f8e 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -4002,7 +4002,8 @@ llvm::Constant *CodeGenModule::GetOrCreateLLVMFunction(
// (If function is requested for a definition, we always need to create a new
// function, not just return a bitcast.)
if (!IsForDefinition)
- return llvm::ConstantExpr::getBitCast(Entry, Ty->getPointerTo());
+ return llvm::ConstantExpr::getBitCast(
+ Entry, Ty->getPointerTo(Entry->getAddressSpace()));
}
// This function doesn't have a complete type (for example, the return
diff --git a/clang/test/CodeGen/avr/alias-avr.c b/clang/test/CodeGen/avr/alias-avr.c
index 88ba3a99eedb2..bcef98a9f5429 100644
--- a/clang/test/CodeGen/avr/alias-avr.c
+++ b/clang/test/CodeGen/avr/alias-avr.c
@@ -6,3 +6,8 @@ int mul(int a, int b) {
// CHECK: @multiply ={{.*}} alias i16 (i16, i16), ptr addrspace(1) @mul
int multiply(int x, int y) __attribute__((alias("mul")));
+
+// Make sure the correct address space is used when creating an alias that needs
+// a pointer cast.
+// CHECK: @smallmul = alias i8 (i16, i16), ptr addrspace(1) @mul
+char smallmul(int a, int b) __attribute__((alias("mul")));
More information about the cfe-commits
mailing list