[llvm] [X86][GlobalIsel] add test for fabs isel (PR #142558)

[via llvm-commits]

https://github.com/mahesh-attarde created https://github.com/llvm/llvm-project/pull/142558

G_FABS Test update for https://github.com/llvm/llvm-project/pull/136718


>From a48e736a2c09da0189b869ff3964148e6bb0be43 Mon Sep 17 00:00:00 2001
From: mattarde <mattarde at intel.com>
Date: Tue, 3 Jun 2025 00:53:15 -0700
Subject: [PATCH] add test for fabs isel

---
 llvm/test/CodeGen/X86/isel-fabs-x87.ll | 21 ++++++++++
 llvm/test/CodeGen/X86/isel-fabs.ll     | 53 ++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 llvm/test/CodeGen/X86/isel-fabs-x87.ll
 create mode 100644 llvm/test/CodeGen/X86/isel-fabs.ll

diff --git a/llvm/test/CodeGen/X86/isel-fabs-x87.ll b/llvm/test/CodeGen/X86/isel-fabs-x87.ll
new file mode 100644
index 0000000000000..f47ffb0df47e9
--- /dev/null
+++ b/llvm/test/CodeGen/X86/isel-fabs-x87.ll
@@ -0,0 +1,21 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=x86_64-- -mattr=+x87,-sse2,-sse | FileCheck %s --check-prefixes=X64
+; RUN: llc < %s -mtriple=x86_64-- -mattr=+x87,-sse2,-sse -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefixes=X64
+; RUN: llc < %s -mtriple=i686-- -mattr=+x87,-sse2,-sse | FileCheck %s --check-prefixes=X86
+; RUN: llc < %s -mtriple=i686-- -mattr=+x87,-sse2,-sse -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefixes=X86
+
+define x86_fp80 @test_x86_fp80_abs(x86_fp80 %arg) {
+; X64-LABEL: test_x86_fp80_abs:
+; X64:       # %bb.0:
+; X64-NEXT:    fldt {{[0-9]+}}(%rsp)
+; X64-NEXT:    fabs
+; X64-NEXT:    retq
+;
+; X86-LABEL: test_x86_fp80_abs:
+; X86:       # %bb.0:
+; X86-NEXT:    fldt {{[0-9]+}}(%esp)
+; X86-NEXT:    fabs
+; X86-NEXT:    retl
+  %abs = tail call x86_fp80 @llvm.fabs.f80(x86_fp80 %arg)
+  ret x86_fp80 %abs
+}
\ No newline at end of file
diff --git a/llvm/test/CodeGen/X86/isel-fabs.ll b/llvm/test/CodeGen/X86/isel-fabs.ll
new file mode 100644
index 0000000000000..cfaedf82751b8
--- /dev/null
+++ b/llvm/test/CodeGen/X86/isel-fabs.ll
@@ -0,0 +1,53 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=x86_64-- -mattr=-x87 | FileCheck %s --check-prefixes=X64
+; RUN: llc < %s -mtriple=x86_64-- -mattr=-x87 -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefixes=X64,FASTISEL-X64
+; RUN: llc < %s -mtriple=i686-- -mattr=-x87 | FileCheck %s --check-prefixes=X86
+; RUN: llc < %s -mtriple=i686-- -mattr=-x87 -fast-isel -fast-isel-abort=1 | FileCheck %s --check-prefixes=FASTISEL-X86
+
+
+define float @test_float_abs(float %arg) {
+; X64-LABEL: test_float_abs:
+; X64:       # %bb.0:
+; X64-NEXT:    andps {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
+; X64-NEXT:    retq
+;
+; X86-LABEL: test_float_abs:
+; X86:       # %bb.0:
+; X86-NEXT:    movl $2147483647, %eax # imm = 0x7FFFFFFF
+; X86-NEXT:    andl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    retl
+;
+; FASTISEL-X86-LABEL: test_float_abs:
+; FASTISEL-X86:       # %bb.0:
+; FASTISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; FASTISEL-X86-NEXT:    andl $2147483647, %eax # imm = 0x7FFFFFFF
+; FASTISEL-X86-NEXT:    retl
+    %abs = tail call float @llvm.fabs.f32(float %arg)
+    ret float %abs
+}
+
+define double @test_double_abs(double %arg) {
+; X64-LABEL: test_double_abs:
+; X64:       # %bb.0:
+; X64-NEXT:    andps {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
+; X64-NEXT:    retq
+;
+; X86-LABEL: test_double_abs:
+; X86:       # %bb.0:
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    movl $2147483647, %edx # imm = 0x7FFFFFFF
+; X86-NEXT:    andl {{[0-9]+}}(%esp), %edx
+; X86-NEXT:    retl
+;
+; FASTISEL-X86-LABEL: test_double_abs:
+; FASTISEL-X86:       # %bb.0:
+; FASTISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
+; FASTISEL-X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; FASTISEL-X86-NEXT:    andl $2147483647, %edx # imm = 0x7FFFFFFF
+; FASTISEL-X86-NEXT:    retl
+    %abs = tail call double @llvm.fabs.f64(double %arg)
+    ret double %abs
+}
+
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; FASTISEL-X64: {{.*}}
\ No newline at end of file