From fc2cba8362b603b376ea9a27b257579efaff14ac Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Fri, 6 Nov 2009 23:45:15 +0000
Subject: [PATCH] Honour subreg machine operands during asmprinting

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86303 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp   |  3 +
 .../ARM/2009-11-07-SubRegAsmPrinting.ll       | 64 +++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll

diff --git a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
index 6a0c8988f27..a3f52cdf19d 100644
--- a/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
+++ b/lib/Target/ARM/AsmPrinter/ARMAsmPrinter.cpp
@@ -347,6 +347,9 @@ void ARMAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
                                                &ARM::DPR_VFP2RegClass);
       O << getRegisterName(DReg) << '[' << (RegNum & 1) << ']';
     } else {
+      if (unsigned SubReg = MO.getSubReg())
+        Reg = TRI->getSubReg(Reg, SubReg);
+
       O << getRegisterName(Reg);
     }
     break;
diff --git a/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll b/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll
new file mode 100644
index 00000000000..0a06991db24
--- /dev/null
+++ b/test/CodeGen/ARM/2009-11-07-SubRegAsmPrinting.ll
@@ -0,0 +1,64 @@
+; RUN: llc -mcpu=cortex-a8 < %s | FileCheck %s
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64"
+target triple = "armv7-eabi"
+
+define arm_aapcs_vfpcc void @foo() {
+entry:
+  %0 = load float* null, align 4                  ; <float> [#uses=2]
+  %1 = fmul float %0, undef                       ; <float> [#uses=2]
+  %2 = fmul float 0.000000e+00, %1                ; <float> [#uses=2]
+  %3 = fmul float %0, %1                          ; <float> [#uses=1]
+  %4 = fadd float 0.000000e+00, %3                ; <float> [#uses=1]
+  %5 = fsub float 1.000000e+00, %4                ; <float> [#uses=1]
+; CHECK: foo:
+; CHECK: fconsts s{{[0-9]+}}, #112
+  %6 = fsub float 1.000000e+00, undef             ; <float> [#uses=2]
+  %7 = fsub float %2, undef                       ; <float> [#uses=1]
+  %8 = fsub float 0.000000e+00, undef             ; <float> [#uses=3]
+  %9 = fadd float %2, undef                       ; <float> [#uses=3]
+  %10 = load float* undef, align 8                ; <float> [#uses=3]
+  %11 = fmul float %8, %10                        ; <float> [#uses=1]
+  %12 = fadd float undef, %11                     ; <float> [#uses=2]
+  %13 = fmul float undef, undef                   ; <float> [#uses=1]
+  %14 = fmul float %6, 0.000000e+00               ; <float> [#uses=1]
+  %15 = fadd float %13, %14                       ; <float> [#uses=1]
+  %16 = fmul float %9, %10                        ; <float> [#uses=1]
+  %17 = fadd float %15, %16                       ; <float> [#uses=2]
+  %18 = fmul float 0.000000e+00, undef            ; <float> [#uses=1]
+  %19 = fadd float %18, 0.000000e+00              ; <float> [#uses=1]
+  %20 = fmul float undef, %10                     ; <float> [#uses=1]
+  %21 = fadd float %19, %20                       ; <float> [#uses=1]
+  %22 = load float* undef, align 8                ; <float> [#uses=1]
+  %23 = fmul float %5, %22                        ; <float> [#uses=1]
+  %24 = fadd float %23, undef                     ; <float> [#uses=1]
+  %25 = load float* undef, align 8                ; <float> [#uses=2]
+  %26 = fmul float %8, %25                        ; <float> [#uses=1]
+  %27 = fadd float %24, %26                       ; <float> [#uses=1]
+  %28 = fmul float %9, %25                        ; <float> [#uses=1]
+  %29 = fadd float undef, %28                     ; <float> [#uses=1]
+  %30 = fmul float %8, undef                      ; <float> [#uses=1]
+  %31 = fadd float undef, %30                     ; <float> [#uses=1]
+  %32 = fmul float %6, undef                      ; <float> [#uses=1]
+  %33 = fadd float undef, %32                     ; <float> [#uses=1]
+  %34 = fmul float %9, undef                      ; <float> [#uses=1]
+  %35 = fadd float %33, %34                       ; <float> [#uses=1]
+  %36 = fmul float 0.000000e+00, undef            ; <float> [#uses=1]
+  %37 = fmul float %7, undef                      ; <float> [#uses=1]
+  %38 = fadd float %36, %37                       ; <float> [#uses=1]
+  %39 = fmul float undef, undef                   ; <float> [#uses=1]
+  %40 = fadd float %38, %39                       ; <float> [#uses=1]
+  store float %12, float* undef, align 8
+  store float %17, float* undef, align 4
+  store float %21, float* undef, align 8
+  store float %27, float* undef, align 8
+  store float %29, float* undef, align 4
+  store float %31, float* undef, align 8
+  store float %40, float* undef, align 8
+  store float %12, float* null, align 8
+  %41 = fmul float %17, undef                     ; <float> [#uses=1]
+  %42 = fadd float %41, undef                     ; <float> [#uses=1]
+  %43 = fmul float %35, undef                     ; <float> [#uses=1]
+  %44 = fadd float %42, %43                       ; <float> [#uses=1]
+  store float %44, float* null, align 4
+  unreachable
+}