[llvm] [NFC][RISCV] Use -O0 in trampoline test for easier code observation (PR #142332)

[Jesse Huang via llvm-commits]

https://github.com/jaidTw created https://github.com/llvm/llvm-project/pull/142332

A portion of the trampoline code is optimized into a load from the constant pool, making the lit test unable to capture the value of it. Disabling the optimization can keep them load from immediates and able to observe any value changes.

>From 44f539fb9cf907787a1822d935f26c6f75ae5f5d Mon Sep 17 00:00:00 2001
From: Jesse Huang <jesse.huang at sifive.com>
Date: Thu, 29 May 2025 10:34:04 -0700
Subject: [PATCH] [NFC][RISCV] Use -O0 in trampoline test for easier code
 observation

---
 llvm/test/CodeGen/RISCV/rv64-trampoline.ll | 80 +++++++++++-----------
 1 file changed, 40 insertions(+), 40 deletions(-)

diff --git a/llvm/test/CodeGen/RISCV/rv64-trampoline.ll b/llvm/test/CodeGen/RISCV/rv64-trampoline.ll
index 1ec4d8ddd1d84..6970324bb184e 100644
--- a/llvm/test/CodeGen/RISCV/rv64-trampoline.ll
+++ b/llvm/test/CodeGen/RISCV/rv64-trampoline.ll
@@ -1,7 +1,7 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
-; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN: llc -O0 -mtriple=riscv64 -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64 %s
-; RUN: llc -mtriple=riscv64-unknown-linux-gnu -verify-machineinstrs < %s \
+; RUN: llc -O0 -mtriple=riscv64-unknown-linux-gnu -verify-machineinstrs < %s \
 ; RUN:   | FileCheck -check-prefix=RV64-LINUX %s
 
 declare void @llvm.init.trampoline(ptr, ptr, ptr)
@@ -13,30 +13,30 @@ define i64 @test0(i64 %n, ptr %p) nounwind {
 ; RV64:       # %bb.0:
 ; RV64-NEXT:    addi sp, sp, -64
 ; RV64-NEXT:    sd ra, 56(sp) # 8-byte Folded Spill
-; RV64-NEXT:    sd s0, 48(sp) # 8-byte Folded Spill
-; RV64-NEXT:    sd s1, 40(sp) # 8-byte Folded Spill
-; RV64-NEXT:    mv s0, a0
+; RV64-NEXT:    sd a0, 8(sp) # 8-byte Folded Spill
 ; RV64-NEXT:    lui a0, %hi(f)
 ; RV64-NEXT:    addi a0, a0, %lo(f)
-; RV64-NEXT:    li a2, 919
-; RV64-NEXT:    lui a3, %hi(.LCPI0_0)
-; RV64-NEXT:    sd a0, 32(sp)
+; RV64-NEXT:    sd a0, 48(sp)
+; RV64-NEXT:    sd a1, 40(sp)
+; RV64-NEXT:    li a0, 919
+; RV64-NEXT:    sw a0, 24(sp)
+; RV64-NEXT:    lui a0, 40
+; RV64-NEXT:    addiw a0, a0, 103
+; RV64-NEXT:    sw a0, 36(sp)
+; RV64-NEXT:    lui a0, 4155
+; RV64-NEXT:    addiw a0, a0, 899
+; RV64-NEXT:    sw a0, 32(sp)
 ; RV64-NEXT:    lui a0, 6203
-; RV64-NEXT:    ld a3, %lo(.LCPI0_0)(a3)
-; RV64-NEXT:    addi a0, a0, 643
-; RV64-NEXT:    sw a2, 8(sp)
-; RV64-NEXT:    sw a0, 12(sp)
-; RV64-NEXT:    sd a3, 16(sp)
-; RV64-NEXT:    sd a1, 24(sp)
-; RV64-NEXT:    addi a1, sp, 24
-; RV64-NEXT:    addi a0, sp, 8
-; RV64-NEXT:    addi s1, sp, 8
+; RV64-NEXT:    addiw a0, a0, 643
+; RV64-NEXT:    sw a0, 28(sp)
+; RV64-NEXT:    addi a1, sp, 40
+; RV64-NEXT:    addi a0, sp, 24
+; RV64-NEXT:    sd a0, 16(sp) # 8-byte Folded Spill
 ; RV64-NEXT:    call __clear_cache
-; RV64-NEXT:    mv a0, s0
-; RV64-NEXT:    jalr s1
+; RV64-NEXT:    ld a0, 8(sp) # 8-byte Folded Reload
+; RV64-NEXT:    ld a1, 16(sp) # 8-byte Folded Reload
+; RV64-NEXT:    jalr a1
 ; RV64-NEXT:    ld ra, 56(sp) # 8-byte Folded Reload
-; RV64-NEXT:    ld s0, 48(sp) # 8-byte Folded Reload
-; RV64-NEXT:    ld s1, 40(sp) # 8-byte Folded Reload
 ; RV64-NEXT:    addi sp, sp, 64
 ; RV64-NEXT:    ret
 ;
@@ -44,31 +44,31 @@ define i64 @test0(i64 %n, ptr %p) nounwind {
 ; RV64-LINUX:       # %bb.0:
 ; RV64-LINUX-NEXT:    addi sp, sp, -64
 ; RV64-LINUX-NEXT:    sd ra, 56(sp) # 8-byte Folded Spill
-; RV64-LINUX-NEXT:    sd s0, 48(sp) # 8-byte Folded Spill
-; RV64-LINUX-NEXT:    sd s1, 40(sp) # 8-byte Folded Spill
-; RV64-LINUX-NEXT:    mv s0, a0
+; RV64-LINUX-NEXT:    sd a0, 8(sp) # 8-byte Folded Spill
 ; RV64-LINUX-NEXT:    lui a0, %hi(f)
 ; RV64-LINUX-NEXT:    addi a0, a0, %lo(f)
-; RV64-LINUX-NEXT:    li a2, 919
-; RV64-LINUX-NEXT:    lui a3, %hi(.LCPI0_0)
-; RV64-LINUX-NEXT:    sd a0, 32(sp)
+; RV64-LINUX-NEXT:    sd a0, 48(sp)
+; RV64-LINUX-NEXT:    sd a1, 40(sp)
+; RV64-LINUX-NEXT:    li a0, 919
+; RV64-LINUX-NEXT:    sw a0, 24(sp)
+; RV64-LINUX-NEXT:    lui a0, 40
+; RV64-LINUX-NEXT:    addiw a0, a0, 103
+; RV64-LINUX-NEXT:    sw a0, 36(sp)
+; RV64-LINUX-NEXT:    lui a0, 4155
+; RV64-LINUX-NEXT:    addiw a0, a0, 899
+; RV64-LINUX-NEXT:    sw a0, 32(sp)
 ; RV64-LINUX-NEXT:    lui a0, 6203
-; RV64-LINUX-NEXT:    ld a3, %lo(.LCPI0_0)(a3)
-; RV64-LINUX-NEXT:    addi a0, a0, 643
-; RV64-LINUX-NEXT:    sw a2, 8(sp)
-; RV64-LINUX-NEXT:    sw a0, 12(sp)
-; RV64-LINUX-NEXT:    sd a3, 16(sp)
-; RV64-LINUX-NEXT:    sd a1, 24(sp)
-; RV64-LINUX-NEXT:    addi a1, sp, 24
-; RV64-LINUX-NEXT:    addi a0, sp, 8
-; RV64-LINUX-NEXT:    addi s1, sp, 8
+; RV64-LINUX-NEXT:    addiw a0, a0, 643
+; RV64-LINUX-NEXT:    sw a0, 28(sp)
+; RV64-LINUX-NEXT:    addi a1, sp, 40
+; RV64-LINUX-NEXT:    addi a0, sp, 24
+; RV64-LINUX-NEXT:    sd a0, 16(sp) # 8-byte Folded Spill
 ; RV64-LINUX-NEXT:    li a2, 0
 ; RV64-LINUX-NEXT:    call __riscv_flush_icache
-; RV64-LINUX-NEXT:    mv a0, s0
-; RV64-LINUX-NEXT:    jalr s1
+; RV64-LINUX-NEXT:    ld a0, 8(sp) # 8-byte Folded Reload
+; RV64-LINUX-NEXT:    ld a1, 16(sp) # 8-byte Folded Reload
+; RV64-LINUX-NEXT:    jalr a1
 ; RV64-LINUX-NEXT:    ld ra, 56(sp) # 8-byte Folded Reload
-; RV64-LINUX-NEXT:    ld s0, 48(sp) # 8-byte Folded Reload
-; RV64-LINUX-NEXT:    ld s1, 40(sp) # 8-byte Folded Reload
 ; RV64-LINUX-NEXT:    addi sp, sp, 64
 ; RV64-LINUX-NEXT:    ret
   %alloca = alloca [32 x i8], align 8