[llvm] [RISCV] [NFC] Add llvm.get.rounding test (PR #139921)

[Craig Topper via llvm-commits]

================
@@ -26,6 +26,85 @@ define i32 @func_01() {
   ret i32 %rm
 }
 
+define i1 @test_get_rounding_sideeffect() {
+; RV32IF-LABEL: test_get_rounding_sideeffect:
+; RV32IF:       # %bb.0: # %entry
+; RV32IF-NEXT:    addi sp, sp, -16
+; RV32IF-NEXT:    .cfi_def_cfa_offset 16
+; RV32IF-NEXT:    sw ra, 12(sp) # 4-byte Folded Spill
+; RV32IF-NEXT:    sw s0, 8(sp) # 4-byte Folded Spill
+; RV32IF-NEXT:    .cfi_offset ra, -4
+; RV32IF-NEXT:    .cfi_offset s0, -8
+; RV32IF-NEXT:    li a0, 1
+; RV32IF-NEXT:    call fesetround
+; RV32IF-NEXT:    frrm a0
+; RV32IF-NEXT:    lui a1, 66
+; RV32IF-NEXT:    slli a0, a0, 2
+; RV32IF-NEXT:    addi a1, a1, 769
+; RV32IF-NEXT:    srl s0, a1, a0
+; RV32IF-NEXT:    li a0, 0
+; RV32IF-NEXT:    andi s0, s0, 7
+; RV32IF-NEXT:    bnez s0, .LBB1_2
+; RV32IF-NEXT:  # %bb.1: # %if.end
+; RV32IF-NEXT:    call fesetround
+; RV32IF-NEXT:    addi s0, s0, -1
+; RV32IF-NEXT:    seqz a0, s0
+; RV32IF-NEXT:  .LBB1_2: # %return
+; RV32IF-NEXT:    lw ra, 12(sp) # 4-byte Folded Reload
+; RV32IF-NEXT:    lw s0, 8(sp) # 4-byte Folded Reload
+; RV32IF-NEXT:    .cfi_restore ra
+; RV32IF-NEXT:    .cfi_restore s0
+; RV32IF-NEXT:    addi sp, sp, 16
+; RV32IF-NEXT:    .cfi_def_cfa_offset 0
+; RV32IF-NEXT:    ret
+;
+; RV64IF-LABEL: test_get_rounding_sideeffect:
+; RV64IF:       # %bb.0: # %entry
+; RV64IF-NEXT:    addi sp, sp, -16
+; RV64IF-NEXT:    .cfi_def_cfa_offset 16
+; RV64IF-NEXT:    sd ra, 8(sp) # 8-byte Folded Spill
+; RV64IF-NEXT:    sd s0, 0(sp) # 8-byte Folded Spill
+; RV64IF-NEXT:    .cfi_offset ra, -8
+; RV64IF-NEXT:    .cfi_offset s0, -16
+; RV64IF-NEXT:    li a0, 1
+; RV64IF-NEXT:    call fesetround
+; RV64IF-NEXT:    frrm a0
+; RV64IF-NEXT:    lui a1, 66
+; RV64IF-NEXT:    slli a0, a0, 2
+; RV64IF-NEXT:    addiw a1, a1, 769
+; RV64IF-NEXT:    srl s0, a1, a0
+; RV64IF-NEXT:    li a0, 0
+; RV64IF-NEXT:    andi s0, s0, 7
+; RV64IF-NEXT:    bnez s0, .LBB1_2
+; RV64IF-NEXT:  # %bb.1: # %if.end
+; RV64IF-NEXT:    call fesetround
+; RV64IF-NEXT:    addi s0, s0, -1
+; RV64IF-NEXT:    seqz a0, s0
+; RV64IF-NEXT:  .LBB1_2: # %return
+; RV64IF-NEXT:    ld ra, 8(sp) # 8-byte Folded Reload
+; RV64IF-NEXT:    ld s0, 0(sp) # 8-byte Folded Reload
+; RV64IF-NEXT:    .cfi_restore ra
+; RV64IF-NEXT:    .cfi_restore s0
+; RV64IF-NEXT:    addi sp, sp, 16
+; RV64IF-NEXT:    .cfi_def_cfa_offset 0
+; RV64IF-NEXT:    ret
+entry:
+  %call = tail call i32 @fesetround(i32 noundef 1)
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topperc wrote:

Should this have the `strictfp` attribute? That's what clang emits with `#pragma STDC FENV_ACCESS ON`

https://github.com/llvm/llvm-project/pull/139921