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llvm-project/llvm/test/CodeGen/X86/smul_fix_sat_constants.ll

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[Intrinsic] Signed Fixed Point Saturation Multiplication Intrinsic Add an intrinsic that takes 2 signed integers with the scale of them provided as the third argument and performs fixed point multiplication on them. The result is saturated and clamped between the largest and smallest representable values of the first 2 operands. This is a part of implementing fixed point arithmetic in clang where some of the more complex operations will be implemented as intrinsics. Differential Revision: https://reviews.llvm.org/D55720 llvm-svn: 361289
2019-05-22 03:17:19 +08:00
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s --check-prefix=X64
; Verify expansion by using constant values. We just want to cover all the paths layed out by ExpandIntRes_MULFIX.
declare i4 @llvm.smul.fix.sat.i4 (i4, i4, i32)
declare i32 @llvm.smul.fix.sat.i32 (i32, i32, i32)
declare i64 @llvm.smul.fix.sat.i64 (i64, i64, i32)
declare <4 x i32> @llvm.smul.fix.sat.v4i32(<4 x i32>, <4 x i32>, i32)
declare { i64, i1 } @llvm.smul.with.overflow.i64(i64, i64)
define i64 @func() nounwind {
; X64-LABEL: func:
; X64: # %bb.0:
; X64-NEXT: movl $2, %ecx
; X64-NEXT: movl $3, %eax
; X64-NEXT: imulq %rcx
; X64-NEXT: shrdq $2, %rdx, %rax
; X64-NEXT: cmpq $1, %rdx
; X64-NEXT: movabsq $9223372036854775807, %rcx # imm = 0x7FFFFFFFFFFFFFFF
; X64-NEXT: cmovgq %rcx, %rax
; X64-NEXT: cmpq $-2, %rdx
; X64-NEXT: movabsq $-9223372036854775808, %rcx # imm = 0x8000000000000000
; X64-NEXT: cmovlq %rcx, %rax
; X64-NEXT: retq
%tmp = call i64 @llvm.smul.fix.sat.i64(i64 3, i64 2, i32 2);
ret i64 %tmp;
}
define i64 @func2() nounwind {
; X64-LABEL: func2:
; X64: # %bb.0:
; X64-NEXT: movl $3, %eax
; X64-NEXT: imulq $2, %rax, %rcx
; X64-NEXT: xorl %edx, %edx
; X64-NEXT: testq %rcx, %rcx
; X64-NEXT: setns %dl
; X64-NEXT: movabsq $9223372036854775807, %rcx # imm = 0x7FFFFFFFFFFFFFFF
; X64-NEXT: addq %rdx, %rcx
; X64-NEXT: imulq $2, %rax, %rax
; X64-NEXT: cmovoq %rcx, %rax
; X64-NEXT: retq
%tmp = call i64 @llvm.smul.fix.sat.i64(i64 3, i64 2, i32 0);
ret i64 %tmp;
}
define i64 @func3() nounwind {
; X64-LABEL: func3:
; X64: # %bb.0:
; X64-NEXT: movabsq $9223372036854775807, %rcx # imm = 0x7FFFFFFFFFFFFFFF
; X64-NEXT: movl $2, %edx
; X64-NEXT: movq %rcx, %rax
; X64-NEXT: imulq %rdx
; X64-NEXT: shrdq $2, %rdx, %rax
; X64-NEXT: cmpq $1, %rdx
; X64-NEXT: cmovgq %rcx, %rax
; X64-NEXT: cmpq $-2, %rdx
; X64-NEXT: movabsq $-9223372036854775808, %rcx # imm = 0x8000000000000000
; X64-NEXT: cmovlq %rcx, %rax
; X64-NEXT: retq
%tmp = call i64 @llvm.smul.fix.sat.i64(i64 9223372036854775807, i64 2, i32 2);
ret i64 %tmp;
}
define i64 @func4() nounwind {
; X64-LABEL: func4:
; X64: # %bb.0:
; X64-NEXT: movabsq $9223372036854775807, %rcx # imm = 0x7FFFFFFFFFFFFFFF
; X64-NEXT: movl $2, %edx
; X64-NEXT: movq %rcx, %rax
; X64-NEXT: imulq %rdx
; X64-NEXT: shrdq $32, %rdx, %rax
; X64-NEXT: cmpq $2147483647, %rdx # imm = 0x7FFFFFFF
; X64-NEXT: cmovgq %rcx, %rax
; X64-NEXT: cmpq $-2147483648, %rdx # imm = 0x80000000
; X64-NEXT: movabsq $-9223372036854775808, %rcx # imm = 0x8000000000000000
; X64-NEXT: cmovlq %rcx, %rax
; X64-NEXT: retq
%tmp = call i64 @llvm.smul.fix.sat.i64(i64 9223372036854775807, i64 2, i32 32);
ret i64 %tmp;
}
define i64 @func5() nounwind {
; X64-LABEL: func5:
; X64: # %bb.0:
; X64-NEXT: movabsq $9223372036854775807, %rcx # imm = 0x7FFFFFFFFFFFFFFF
; X64-NEXT: movl $2, %edx
; X64-NEXT: movq %rcx, %rax
; X64-NEXT: imulq %rdx
; X64-NEXT: shrdq $63, %rdx, %rax
; X64-NEXT: movabsq $4611686018427387903, %rsi # imm = 0x3FFFFFFFFFFFFFFF
; X64-NEXT: cmpq %rsi, %rdx
; X64-NEXT: cmovgq %rcx, %rax
; X64-NEXT: movabsq $-4611686018427387904, %rcx # imm = 0xC000000000000000
; X64-NEXT: cmpq %rcx, %rdx
; X64-NEXT: movabsq $-9223372036854775808, %rcx # imm = 0x8000000000000000
; X64-NEXT: cmovlq %rcx, %rax
; X64-NEXT: retq
%tmp = call i64 @llvm.smul.fix.sat.i64(i64 9223372036854775807, i64 2, i32 63);
ret i64 %tmp;
}