[llvm] a0af049 - [RISCV][NFC] Add more tests for instruction selection of 'mul'

[Ben Shi via llvm-commits]

Author: Ping Deng
Date: 2022-06-15T03:48:17Z
New Revision: a0af0496147d08e9522bf22adaa8d565390313f1

URL: https://github.com/llvm/llvm-project/commit/a0af0496147d08e9522bf22adaa8d565390313f1
DIFF: https://github.com/llvm/llvm-project/commit/a0af0496147d08e9522bf22adaa8d565390313f1.diff

LOG: [RISCV][NFC] Add more tests for instruction selection of 'mul'

precommit tests for D127474

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D127475

Added: 
    

Modified: 
    llvm/test/CodeGen/RISCV/mul.ll

Removed: 
    


################################################################################
diff  --git a/llvm/test/CodeGen/RISCV/mul.ll b/llvm/test/CodeGen/RISCV/mul.ll
index 5782a601ce842..f72556e7155f3 100644
--- a/llvm/test/CodeGen/RISCV/mul.ll
+++ b/llvm/test/CodeGen/RISCV/mul.ll
@@ -1580,3 +1580,55 @@ define i8 @muladd_demand(i8 %x, i8 %y) nounwind {
   %r = and i8 %a, 15
   ret i8 %r
 }
+
+define i8 @mulsub_demand(i8 %x, i8 %y) nounwind {
+; RV32I-LABEL: mulsub_demand:
+; RV32I:       # %bb.0:
+; RV32I-NEXT:    addi sp, sp, -16
+; RV32I-NEXT:    sw ra, 12(sp) # 4-byte Folded Spill
+; RV32I-NEXT:    sw s0, 8(sp) # 4-byte Folded Spill
+; RV32I-NEXT:    mv s0, a1
+; RV32I-NEXT:    li a1, 14
+; RV32I-NEXT:    call __mulsi3 at plt
+; RV32I-NEXT:    sub a0, s0, a0
+; RV32I-NEXT:    andi a0, a0, 15
+; RV32I-NEXT:    lw ra, 12(sp) # 4-byte Folded Reload
+; RV32I-NEXT:    lw s0, 8(sp) # 4-byte Folded Reload
+; RV32I-NEXT:    addi sp, sp, 16
+; RV32I-NEXT:    ret
+;
+; RV32IM-LABEL: mulsub_demand:
+; RV32IM:       # %bb.0:
+; RV32IM-NEXT:    li a2, 14
+; RV32IM-NEXT:    mul a0, a0, a2
+; RV32IM-NEXT:    sub a0, a1, a0
+; RV32IM-NEXT:    andi a0, a0, 15
+; RV32IM-NEXT:    ret
+;
+; RV64I-LABEL: mulsub_demand:
+; RV64I:       # %bb.0:
+; RV64I-NEXT:    addi sp, sp, -16
+; RV64I-NEXT:    sd ra, 8(sp) # 8-byte Folded Spill
+; RV64I-NEXT:    sd s0, 0(sp) # 8-byte Folded Spill
+; RV64I-NEXT:    mv s0, a1
+; RV64I-NEXT:    li a1, 14
+; RV64I-NEXT:    call __muldi3 at plt
+; RV64I-NEXT:    subw a0, s0, a0
+; RV64I-NEXT:    andi a0, a0, 15
+; RV64I-NEXT:    ld ra, 8(sp) # 8-byte Folded Reload
+; RV64I-NEXT:    ld s0, 0(sp) # 8-byte Folded Reload
+; RV64I-NEXT:    addi sp, sp, 16
+; RV64I-NEXT:    ret
+;
+; RV64IM-LABEL: mulsub_demand:
+; RV64IM:       # %bb.0:
+; RV64IM-NEXT:    li a2, 14
+; RV64IM-NEXT:    mulw a0, a0, a2
+; RV64IM-NEXT:    subw a0, a1, a0
+; RV64IM-NEXT:    andi a0, a0, 15
+; RV64IM-NEXT:    ret
+  %m = mul i8 %x, 14
+  %a = sub i8 %y, %m
+  %r = and i8 %a, 15
+  ret i8 %r
+}