[PATCH] D73378: [SystemZ] Add implementation for the intrinsic llvm.read_register
Kai Nacke via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Feb 10 05:21:10 PST 2020
This revision was automatically updated to reflect the committed changes.
Closed by commit rG34946dfd7950: [SystemZ] Add implementation for the intrinsic llvm.read_register (authored by Kai).
Changed prior to commit:
https://reviews.llvm.org/D73378?vs=240250&id=243519#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D73378/new/
https://reviews.llvm.org/D73378
Files:
llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
llvm/lib/Target/SystemZ/SystemZISelLowering.h
llvm/test/CodeGen/SystemZ/stackpointer.ll
Index: llvm/test/CodeGen/SystemZ/stackpointer.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/SystemZ/stackpointer.ll
@@ -0,0 +1,15 @@
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+define i8* @get_stack() nounwind {
+entry:
+; CHECK-LABEL: get_stack:
+; CHECK: lgr %r2, %r15
+; CHECK-NEXT: br %r14
+ %0 = call i64 @llvm.read_register.i64(metadata !0)
+ %1 = inttoptr i64 %0 to i8*
+ ret i8* %1
+}
+
+declare i64 @llvm.read_register.i64(metadata) nounwind
+
+!0 = !{!"r15"}
Index: llvm/lib/Target/SystemZ/SystemZISelLowering.h
===================================================================
--- llvm/lib/Target/SystemZ/SystemZISelLowering.h
+++ llvm/lib/Target/SystemZ/SystemZISelLowering.h
@@ -473,6 +473,9 @@
return TargetLowering::getInlineAsmMemConstraint(ConstraintCode);
}
+ Register getRegisterByName(const char *RegName, LLT VT,
+ const MachineFunction &MF) const override;
+
/// If a physical register, this returns the register that receives the
/// exception address on entry to an EH pad.
unsigned
Index: llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
===================================================================
--- llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -1193,6 +1193,19 @@
return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
}
+// FIXME? Maybe this could be a TableGen attribute on some registers and
+// this table could be generated automatically from RegInfo.
+Register SystemZTargetLowering::getRegisterByName(const char *RegName, LLT VT,
+ const MachineFunction &MF) const {
+
+ Register Reg = StringSwitch<Register>(RegName)
+ .Case("r15", SystemZ::R15D)
+ .Default(0);
+ if (Reg)
+ return Reg;
+ report_fatal_error("Invalid register name global variable");
+}
+
void SystemZTargetLowering::
LowerAsmOperandForConstraint(SDValue Op, std::string &Constraint,
std::vector<SDValue> &Ops,
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