10a55caccf
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).
15 lines
476 B
LLVM
15 lines
476 B
LLVM
; RUN: not llc -mtriple=riscv64 < %s 2>&1 | FileCheck %s
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@a = external global [4 x i32], align 16
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; CHECK-COUNT-2: error: invalid operand for inline asm constraint 's'
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; CHECK-NOT: error:
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define void @test(i64 %i) {
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entry:
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%x = alloca i32, align 4
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%ai = getelementptr inbounds [4 x i32], ptr @a, i64 0, i64 %i
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call void asm sideeffect "", "s,~{dirflag},~{fpsr},~{flags}"(ptr %x)
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call void asm sideeffect "", "s,~{dirflag},~{fpsr},~{flags}"(ptr %ai)
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ret void
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}
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