From 285c0f4fdc14a266f0765816c42c2c8a57601cbb Mon Sep 17 00:00:00 2001
From: Stefan Maksimovic <stefan.maksimovic@mips.com>
Date: Fri, 12 Oct 2018 08:18:38 +0000
Subject: [mips] Mark fmaxl as a long double emulation routine

Failure was discovered upon running
projects/compiler-rt/test/builtins/Unit/divtc3_test.c
in a stage2 compiler build.

When compiling projects/compiler-rt/lib/builtins/divtc3.c,
a call to fmaxl within the divtc3 implementation had its
return values read from registers $2 and $3 instead of $f0 and $f2.
Include fmaxl in the list of long double emulation routines
to have its return value correctly interpreted as f128.

Almost exact issue here: https://reviews.llvm.org/D17760

Differential Revision: https://reviews.llvm.org/D52649

llvm-svn: 344326
---
 llvm/test/CodeGen/Mips/cconv/fmaxl_call.ll | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 llvm/test/CodeGen/Mips/cconv/fmaxl_call.ll

(limited to 'llvm/test/CodeGen')

diff --git a/llvm/test/CodeGen/Mips/cconv/fmaxl_call.ll b/llvm/test/CodeGen/Mips/cconv/fmaxl_call.ll
new file mode 100644
index 00000000000..0e3078edae4
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/cconv/fmaxl_call.ll
@@ -0,0 +1,25 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=mips64el-unknown-linux-gnu -mcpu=mips64 < %s | FileCheck %s
+
+define fp128 @call_fmaxl(fp128 %a, fp128 %b) {
+; CHECK-LABEL: call_fmaxl:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    daddiu $sp, $sp, -16
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    sd $ra, 8($sp) # 8-byte Folded Spill
+; CHECK-NEXT:    .cfi_offset 31, -8
+; CHECK-NEXT:    jal fmaxl
+; CHECK-NEXT:    nop
+; CHECK-NEXT:    mov.d $f12, $f0
+; CHECK-NEXT:    jal f
+; CHECK-NEXT:    mov.d $f13, $f2
+; CHECK-NEXT:    ld $ra, 8($sp) # 8-byte Folded Reload
+; CHECK-NEXT:    jr $ra
+; CHECK-NEXT:    daddiu $sp, $sp, 16
+    %1 = call fp128 @llvm.maxnum.f128(fp128 %a, fp128 %b)
+    %2 = call fp128 @f(fp128 %1)
+    ret fp128 %2
+}
+
+declare fp128 @llvm.maxnum.f128(fp128, fp128)
+declare fp128 @f(fp128)
-- 
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