3d89fb4d13
Similar to D46745, "S" represents an absolute symbolic operand, which
can be used to specify the access models, e.g.
extern int var;
void *addr_via_asm() {
void *ret;
asm("lui %0, %%hi(%1)\naddi %0,%0,%%lo(%1)" : "=r"(ret) : "S"(&var));
return ret;
}
'S' is documented in trunk GCC: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101275
Reviewed By: luismarques
Differential Revision: https://reviews.llvm.org/D105254
55 lines
1.6 KiB
LLVM
55 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=riscv32 < %s | FileCheck %s --check-prefix=RV32
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; RUN: llc -mtriple=riscv64 < %s | FileCheck %s --check-prefix=RV64
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@var = external dso_local global i32, align 4
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define dso_local i8* @constraint_S() {
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; RV32-LABEL: constraint_S:
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; RV32: # %bb.0:
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; RV32-NEXT: #APP
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; RV32-NEXT: lui a0, %hi(var)
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; RV32-NEXT: addi a0, a0, %lo(var)
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; RV32-NEXT: #NO_APP
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; RV32-NEXT: ret
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;
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; RV64-LABEL: constraint_S:
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; RV64: # %bb.0:
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; RV64-NEXT: #APP
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; RV64-NEXT: lui a0, %hi(var)
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; RV64-NEXT: addi a0, a0, %lo(var)
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; RV64-NEXT: #NO_APP
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; RV64-NEXT: ret
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%ret = tail call i8* asm "lui $0, %hi($1)\0Aaddi $0, $0, %lo($1)", "=r,S"(i32* nonnull @var)
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ret i8* %ret
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}
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; Function Attrs: nofree nosync nounwind readnone
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define dso_local i8* @constraint_S_label() {
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; RV32-LABEL: constraint_S_label:
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; RV32: # %bb.0: # %entry
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; RV32-NEXT: .Ltmp0: # Block address taken
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; RV32-NEXT: # %bb.1: # %L1
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; RV32-NEXT: #APP
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; RV32-NEXT: lui a0, %hi(.Ltmp0)
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; RV32-NEXT: addi a0, a0, %lo(.Ltmp0)
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; RV32-NEXT: #NO_APP
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; RV32-NEXT: ret
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;
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; RV64-LABEL: constraint_S_label:
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; RV64: # %bb.0: # %entry
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; RV64-NEXT: .Ltmp0: # Block address taken
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; RV64-NEXT: # %bb.1: # %L1
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; RV64-NEXT: #APP
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; RV64-NEXT: lui a0, %hi(.Ltmp0)
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; RV64-NEXT: addi a0, a0, %lo(.Ltmp0)
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; RV64-NEXT: #NO_APP
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; RV64-NEXT: ret
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entry:
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br label %L1
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L1:
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%ret = tail call i8* asm "lui $0, %hi($1)\0Aaddi $0, $0, %lo($1)", "=r,S"(i8* blockaddress(@constraint_S_label, %L1))
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ret i8* %ret
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}
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