[RISCV] Make Zalrsc+Zaamo imply A. (#163890)

Author: topperc

llvm/lib/TargetParser/RISCVISAInfo.cpp

@@ -887,7 +887,7 @@ void RISCVISAInfo::updateImplication() {
 }
 
 static constexpr StringLiteral CombineIntoExts[] = {
-    {"b"},     {"zk"},    {"zkn"},  {"zks"},   {"zvkn"},
+    {"a"},     {"b"},     {"zk"},   {"zkn"},   {"zks"},   {"zvkn"},
     {"zvknc"}, {"zvkng"}, {"zvks"}, {"zvksc"}, {"zvksg"},
 };
 

llvm/test/CodeGen/RISCV/attributes.ll

@@ -80,6 +80,7 @@
 ; RUN: llc -mtriple=riscv32 -mattr=+xwchc %s -o - | FileCheck --check-prefix=RV32XWCHC %s
 ; RUN: llc -mtriple=riscv32 -mattr=+zaamo %s -o - | FileCheck --check-prefix=RV32ZAAMO %s
 ; RUN: llc -mtriple=riscv32 -mattr=+zalrsc %s -o - | FileCheck --check-prefix=RV32ZALRSC %s
+; RUN: llc -mtriple=riscv32 -mattr=+zaamo,+zalrsc %s -o - | FileCheck --check-prefixes=CHECK,RV32COMBINEINTOA %s
 ; RUN: llc -mtriple=riscv32 -mattr=+zca %s -o - | FileCheck --check-prefixes=CHECK,RV32ZCA %s
 ; RUN: llc -mtriple=riscv32 -mattr=+zcb %s -o - | FileCheck --check-prefixes=CHECK,RV32ZCB %s
 ; RUN: llc -mtriple=riscv32 -mattr=+zcd %s -o - | FileCheck --check-prefixes=CHECK,RV32ZCD %s
@@ -227,6 +228,7 @@
 ; RUN: llc -mtriple=riscv64 -mattr=+ztso %s -o - | FileCheck --check-prefixes=CHECK,RV64ZTSO %s
 ; RUN: llc -mtriple=riscv64 -mattr=+zaamo %s -o - | FileCheck --check-prefix=RV64ZAAMO %s
 ; RUN: llc -mtriple=riscv64 -mattr=+zalrsc %s -o - | FileCheck --check-prefix=RV64ZALRSC %s
+; RUN: llc -mtriple=riscv64 -mattr=+zaamo,+zalrsc %s -o - | FileCheck --check-prefixes=CHECK,RV64COMBINEINTOA %s
 ; RUN: llc -mtriple=riscv64 -mattr=+zca %s -o - | FileCheck --check-prefixes=CHECK,RV64ZCA %s
 ; RUN: llc -mtriple=riscv64 -mattr=+zcb %s -o - | FileCheck --check-prefixes=CHECK,RV64ZCB %s
 ; RUN: llc -mtriple=riscv64 -mattr=+zcd %s -o - | FileCheck --check-prefixes=CHECK,RV64ZCD %s
@@ -392,6 +394,7 @@
 ; RV32XWCHC: .attribute 5, "rv32i2p1_zca1p0_xwchc2p2"
 ; RV32ZAAMO: .attribute 5, "rv32i2p1_zaamo1p0"
 ; RV32ZALRSC: .attribute 5, "rv32i2p1_zalrsc1p0"
+; RV32COMBINEINTOA: .attribute 5, "rv32i2p1_a2p1_zaamo1p0_zalrsc1p0"
 ; RV32ZCA: .attribute 5, "rv32i2p1_zca1p0"
 ; RV32ZCB: .attribute 5, "rv32i2p1_zca1p0_zcb1p0"
 ; RV32ZCD: .attribute 5, "rv32i2p1_f2p2_d2p2_zicsr2p0_zca1p0_zcd1p0"
@@ -537,6 +540,7 @@
 ; RV64ZTSO: .attribute 5, "rv64i2p1_ztso1p0"
 ; RV64ZAAMO: .attribute 5, "rv64i2p1_zaamo1p0"
 ; RV64ZALRSC: .attribute 5, "rv64i2p1_zalrsc1p0"
+; RV64COMBINEINTOA: .attribute 5, "rv64i2p1_a2p1_zaamo1p0_zalrsc1p0"
 ; RV64ZCA: .attribute 5, "rv64i2p1_zca1p0"
 ; RV64ZCB: .attribute 5, "rv64i2p1_zca1p0_zcb1p0"
 ; RV64ZCD: .attribute 5, "rv64i2p1_f2p2_d2p2_zicsr2p0_zca1p0_zcd1p0"