AMDGPU/R600: Emit rodata in text segment

R600 relies on this behaviour.
Fixes: 6e18266 ('Partially revert D61491 "AMDGPU: Be explicit about whether the high-word in SI_PC_ADD_REL_OFFSET is 0"')
Fixes ~100 piglit regressions since 6e18266

Differential Revision: https://reviews.llvm.org/D72991

Author: jvesely

llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp

@@ -559,7 +559,7 @@ bool isReadOnlySegment(const GlobalValue *GV) {
 }
 
 bool shouldEmitConstantsToTextSection(const Triple &TT) {
-  return TT.getOS() == Triple::AMDPAL;
+  return TT.getOS() == Triple::AMDPAL || TT.getArch() == Triple::r600;
 }
 
 int getIntegerAttribute(const Function &F, StringRef Name, int Default) {

llvm/test/CodeGen/AMDGPU/global-constant.ll

@@ -2,6 +2,7 @@
 ; RUN: llc -mtriple=amdgcn-- -mcpu=kaveri -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=NOPAL %s
 ; RUN: llc -mtriple=amdgcn-mesa-mesa3d -mcpu=kaveri -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=NOPAL %s
 ; RUN: llc -mtriple=amdgcn--amdhsa -mcpu=kaveri -verify-machineinstrs < %s | FileCheck -check-prefix=GCN -check-prefix=NOPAL %s
+; RUN: llc -mtriple=r600-- -mcpu=cypress < %s | FileCheck -check-prefix=R600 %s
 
 @private1 = private unnamed_addr addrspace(4) constant [4 x float] [float 0.0, float 1.0, float 2.0, float 3.0]
 @private2 = private unnamed_addr addrspace(4) constant [4 x float] [float 4.0, float 5.0, float 6.0, float 7.0]
@@ -28,6 +29,7 @@
 ; NOPAL: s_add_u32 s{{[0-9]+}}, s[[PC1_LO]], private2@rel32@lo+4
 ; NOPAL: s_addc_u32 s{{[0-9]+}}, s[[PC1_HI]], private2@rel32@hi+4
 
+; R600-LABEL: private_test
 define amdgpu_kernel void @private_test(i32 %index, float addrspace(1)* %out) {
   %ptr = getelementptr [4 x float], [4 x float] addrspace(4) * @private1, i32 0, i32 %index
   %val = load float, float addrspace(4)* %ptr
@@ -42,6 +44,7 @@ define amdgpu_kernel void @private_test(i32 %index, float addrspace(1)* %out) {
 ; NOPAL: s_getpc_b64 s{{\[}}[[PC0_LO:[0-9]+]]:[[PC0_HI:[0-9]+]]{{\]}}
 ; NOPAL: s_add_u32 s{{[0-9]+}}, s[[PC0_LO]], available_externally@gotpcrel32@lo+4
 ; NOPAL: s_addc_u32 s{{[0-9]+}}, s[[PC0_HI]], available_externally@gotpcrel32@hi+4
+; R600-LABEL: available_externally_test
 define amdgpu_kernel void @available_externally_test(i32 addrspace(1)* %out) {
   %ptr = getelementptr [256 x i32], [256 x i32] addrspace(4)* @available_externally, i32 0, i32 1
   %val = load i32, i32 addrspace(4)* %ptr
@@ -51,6 +54,9 @@ define amdgpu_kernel void @available_externally_test(i32 addrspace(1)* %out) {
 
 ; PAL: .text
 ; NOPAL: .section .rodata
+; R600: .text
 
 ; GCN: private1:
 ; GCN: private2:
+; R600: private1:
+; R600: private2: