[llvm] [PowerPC] Pre-commit test case to ensure that milicode is not used for memcmp, but instead a library call is used on AIX OS. (PR #146948)

[zhijian lin via llvm-commits]

https://github.com/diggerlin updated https://github.com/llvm/llvm-project/pull/146948

>From ed2b7b7b1ced2b24ba9fa86646488ce49ca58ff3 Mon Sep 17 00:00:00 2001
From: zhijian <zhijian at ca.ibm.com>
Date: Thu, 3 Jul 2025 15:31:34 -0400
Subject: [PATCH] [PowerPC] Pre-commit test case to ensure that milicode is not
 used for memcmp, but instead a library call is used on AIX OS

---
 llvm/test/CodeGen/PowerPC/memintr32.ll | 26 ++++++++++++
 llvm/test/CodeGen/PowerPC/memintr64.ll | 59 ++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 llvm/test/CodeGen/PowerPC/memintr32.ll
 create mode 100644 llvm/test/CodeGen/PowerPC/memintr64.ll

diff --git a/llvm/test/CodeGen/PowerPC/memintr32.ll b/llvm/test/CodeGen/PowerPC/memintr32.ll
new file mode 100644
index 0000000000000..d80ecb412727e
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/memintr32.ll
@@ -0,0 +1,26 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -verify-machineinstrs -mcpu=pwr9 -ppc-asm-full-reg-names -mtriple=powerpc-ibm-aix < %s | \
+; RUN:   FileCheck %s --check-prefix=CHECK-AIX-32-P9
+
+
+define i32 @memcmp_test(ptr nocapture noundef readonly %ptr1, ptr nocapture noundef readonly %ptr2, i32 noundef %num) local_unnamed_addr {
+; CHECK-AIX-32-P9-LABEL: memcmp_test:
+; CHECK-AIX-32-P9:       # %bb.0: # %entry
+; CHECK-AIX-32-P9-NEXT:    mflr r0
+; CHECK-AIX-32-P9-NEXT:    stwu r1, -64(r1)
+; CHECK-AIX-32-P9-NEXT:    stw r0, 72(r1)
+; CHECK-AIX-32-P9-NEXT:    bl .memcmp[PR]
+; CHECK-AIX-32-P9-NEXT:    nop
+; CHECK-AIX-32-P9-NEXT:    addi r1, r1, 64
+; CHECK-AIX-32-P9-NEXT:    lwz r0, 8(r1)
+; CHECK-AIX-32-P9-NEXT:    mtlr r0
+; CHECK-AIX-32-P9-NEXT:    blr
+entry:
+  %call = tail call i32 @memcmp(ptr noundef %ptr1, ptr noundef %ptr2, i32 noundef %num)
+    ret i32 %call
+}
+
+declare i32 @memcmp(ptr noundef captures(none), ptr noundef captures(none), i32 noundef) local_unnamed_addr
+
+
+
diff --git a/llvm/test/CodeGen/PowerPC/memintr64.ll b/llvm/test/CodeGen/PowerPC/memintr64.ll
new file mode 100644
index 0000000000000..adf0ea16de3db
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/memintr64.ll
@@ -0,0 +1,59 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -verify-machineinstrs -mcpu=pwr9 -ppc-asm-full-reg-names \
+; RUN:   -mtriple=powerpc64le-unknown-linux-gnu < %s | \
+; RUN:   FileCheck %s --check-prefix=CHECK-LE-P9
+; RUN: llc -verify-machineinstrs -mcpu=pwr9 -ppc-asm-full-reg-names \
+; RUN:   -mtriple=powerpc64-unknown-linux-gnu < %s | \
+; RUN:   FileCheck %s --check-prefix=CHECK-BE-P9
+; RUN: llc -verify-machineinstrs -mcpu=pwr9 -ppc-asm-full-reg-names \
+; RUN:    -mtriple=powerpc64-ibm-aix < %s | \
+; RUN:   FileCheck %s --check-prefix=CHECK-AIX-64-P9
+
+define noundef i32 @_Z11memcmp_testPKvS0_m(ptr noundef readonly captures(none) %ptr1, ptr noundef readonly captures(none) %ptr2, i64 noundef %num) local_unnamed_addr {
+; CHECK-LE-P9-LABEL: _Z11memcmp_testPKvS0_m:
+; CHECK-LE-P9:       # %bb.0: # %entry
+; CHECK-LE-P9-NEXT:    mflr r0
+; CHECK-LE-P9-NEXT:    stdu r1, -32(r1)
+; CHECK-LE-P9-NEXT:    std r0, 48(r1)
+; CHECK-LE-P9-NEXT:    .cfi_def_cfa_offset 32
+; CHECK-LE-P9-NEXT:    .cfi_offset lr, 16
+; CHECK-LE-P9-NEXT:    bl memcmp
+; CHECK-LE-P9-NEXT:    nop
+; CHECK-LE-P9-NEXT:    addi r1, r1, 32
+; CHECK-LE-P9-NEXT:    ld r0, 16(r1)
+; CHECK-LE-P9-NEXT:    mtlr r0
+; CHECK-LE-P9-NEXT:    blr
+;
+; CHECK-BE-P9-LABEL: _Z11memcmp_testPKvS0_m:
+; CHECK-BE-P9:       # %bb.0: # %entry
+; CHECK-BE-P9-NEXT:    mflr r0
+; CHECK-BE-P9-NEXT:    stdu r1, -112(r1)
+; CHECK-BE-P9-NEXT:    std r0, 128(r1)
+; CHECK-BE-P9-NEXT:    .cfi_def_cfa_offset 112
+; CHECK-BE-P9-NEXT:    .cfi_offset lr, 16
+; CHECK-BE-P9-NEXT:    bl memcmp
+; CHECK-BE-P9-NEXT:    nop
+; CHECK-BE-P9-NEXT:    addi r1, r1, 112
+; CHECK-BE-P9-NEXT:    ld r0, 16(r1)
+; CHECK-BE-P9-NEXT:    mtlr r0
+; CHECK-BE-P9-NEXT:    blr
+;
+; CHECK-AIX-64-P9-LABEL: _Z11memcmp_testPKvS0_m:
+; CHECK-AIX-64-P9:       # %bb.0: # %entry
+; CHECK-AIX-64-P9-NEXT:    mflr r0
+; CHECK-AIX-64-P9-NEXT:    stdu r1, -112(r1)
+; CHECK-AIX-64-P9-NEXT:    std r0, 128(r1)
+; CHECK-AIX-64-P9-NEXT:    bl .memcmp[PR]
+; CHECK-AIX-64-P9-NEXT:    nop
+; CHECK-AIX-64-P9-NEXT:    addi r1, r1, 112
+; CHECK-AIX-64-P9-NEXT:    ld r0, 16(r1)
+; CHECK-AIX-64-P9-NEXT:    mtlr r0
+; CHECK-AIX-64-P9-NEXT:    blr
+entry:
+  %call = tail call i32 @memcmp(ptr noundef %ptr1, ptr noundef %ptr2, i64 noundef %num)
+  ret i32 %call
+}
+
+declare i32 @memcmp(ptr noundef captures(none), ptr noundef captures(none), i64 noundef) local_unnamed_addr
+
+