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GCC has supported a generic constraint "s" for a long time (since at
least 1992), which references a symbol or label with an optional
constant offset. "i" is a superset that also supports a constant
integer.
GCC's RISC-V port also supports a machine-specific constraint "S",
which cannot be used with a preemptible symbol. (We don't bother to
check preemptibility.) In PIC code, an external symbol is preemptible by
default, making "S" less useful if you want to create an artificial
reference for linker garbage collection, or define sections to hold
symbol addresses:
```
void fun();
// error: impossible constraint in ‘asm’ for riscv64-linux-gnu-gcc -fpie/-fpic
void foo() { asm(".reloc ., BFD_RELOC_NONE, %0" :: "S"(fun)); }
// good even if -fpie/-fpic
void foo() { asm(".reloc ., BFD_RELOC_NONE, %0" :: "s"(fun)); }
```
This patch adds support for "s". Modify https://reviews.llvm.org/D105254
("S") to handle multi-depth GEPs (https://reviews.llvm.org/D61560).
40 lines
1.7 KiB
C
40 lines
1.7 KiB
C
// RUN: %clang_cc1 -triple riscv32 -fsyntax-only -verify %s
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// RUN: %clang_cc1 -triple riscv64 -fsyntax-only -verify %s
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void I(int i) {
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static const int BelowMin = -2049;
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static const int AboveMax = 2048;
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asm volatile ("" :: "I"(BelowMin)); // expected-error{{value '-2049' out of range for constraint 'I'}}
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asm volatile ("" :: "I"(AboveMax)); // expected-error{{value '2048' out of range for constraint 'I'}}
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}
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void J(int j) {
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static const int BelowMin = -1;
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static const int AboveMax = 1;
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asm volatile ("" :: "J"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'J'}}
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asm volatile ("" :: "J"(AboveMax)); // expected-error{{value '1' out of range for constraint 'J'}}
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}
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void K(int k) {
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static const int BelowMin = -1;
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static const int AboveMax = 32;
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asm volatile ("" :: "K"(BelowMin)); // expected-error{{value '-1' out of range for constraint 'K'}}
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asm volatile ("" :: "K"(AboveMax)); // expected-error{{value '32' out of range for constraint 'K'}}
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}
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void test_s(int i) {
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asm("" :: "s"(test_s(0))); // expected-error{{invalid type 'void' in asm input for constraint 's'}}
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/// Codegen error
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asm("" :: "s"(i));
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asm("" :: "S"(test_s(0))); // expected-error{{invalid type 'void' in asm input for constraint 'S'}}
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}
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void test_clobber_conflict(void) {
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register long x10 asm("x10");
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asm volatile("" :: "r"(x10) : "x10"); // expected-error {{conflicts with asm clobber list}}
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asm volatile("" :: "r"(x10) : "a0"); // expected-error {{conflicts with asm clobber list}}
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asm volatile("" : "=r"(x10) :: "x10"); // expected-error {{conflicts with asm clobber list}}
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asm volatile("" : "=r"(x10) :: "a0"); // expected-error {{conflicts with asm clobber list}}
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}
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